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Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS

Browse Navigation:

1. Browse Navigation
2. In short
3. The main differences from the previous model
4. History
5. Main Specifications
6. Assembly
7. LOCK Button
8. Stabilizer
9. Focusing
10. The effect of F / 6.3 on focus
11. Image quality and sample photos
12. Alternatives
13. My personal experience with the lens
14. Results
15. User Comments
16. Add your review or question on the lens

In this review, the Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS (Optical Stabilizer) lens I will abbreviate as 'Sigma 18-200mm f / 3.5-6.3 II OS HSM'. Here I am reviewing the version for Nikon DX cameras.

Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS

In short

Sigma 18-200mm f / 3.5-6.3 II OS HSM - universal lens for cropped cameras with APS-C sensor, an updated version of an older model Sigma 18-200mm f / 3.5-6.3 OS HSM. The lens uses a wide range of focal lengths and can shoot both in wide-angle and in the tele-range. It is interesting for image stabilizer, ultrasonic focusing motor, internal focusing and small size (when folded). In general, the Sigma 18-200mm f / 3.5-6.3 II OS HSM acts as an inexpensive and functional solution for cropped cameras, providing a mediocre image quality, but quite suitable for amateur and advanced amateur photography. In general, a little better than the previous model. Sigma 18-200mm f / 3.5-6.3 OS HSM.

According to TIPA Sigma 18-200mm f / 3.5-6.3 II OS HSM is the best amateur lens of 2012 for digital SLR cameras.

The main differences from the previous model:

• Another optical design. Sigma 18-200mm f / 3.5-6.3 II OS HSM uses a little more special optical elements, including the new Sigma FLD, which has the property of fluorite, but at the same time cheaper to manufacture and with a lower weight.
• The Sigma 18-200mm f / 3.5-6.3 II OS HSM has a smaller front filter diameter (62 mm versus 72 mm for Sigma 18-200mm f / 3.5-6.3 OS HSM)
• The possibilities of macro photography have increased a little, now the maximum zoom ratio is 1: 3.8 instead of 1: 3.9.
• The weight of the lens decreased from 600 to 490 grams.
• The Sigma 18-200mm f / 3.5-6.3 II OS HSM is a newer lens, released 5 years after Sigma 18-200mm f / 3.5-6.3 OS HSM.
• All versions of the Sigma 18-200mm f / 3.5-6.3 II OS HSM lenses have an ultrasonic motor, while an ultrasonic motor for Sigma 18-200mm f / 3.5-6.3 OS HSM Used only in the Nikon camera version.
• Changed the design of the case. The Sigma 18-200mm f / 3.5-6.3 II OS HSM version is easily recognizable by the red border near the front lens

I did not find any significant other changes in the new lens.

Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS

History

The first Sigma class 18-200 / 3.5-6.3 hyperzoom was introduced in early 2005, six months earlier than the original Nikon 18-200 / 3.5-5.6 VR and 3 years earlier than the original Canon 18-200/3.5-5.6 IS. In the future, the line of lenses was refined and underwent many various changes. And due to the fact that Sigma also produces lenses with different mounts, for Nikon, Canon, Pentax, Sigma, Sony / Minolta systems, there can be a huge number of different sub-versions and versions of the same model. I divided the main versions according to optical schemes:

1. Sigma Zoom DC 18-200mm 1:3.5-6.3 [EF, F, K, SA, A], February 2005, scheme 15/13, with red ring and velvet body, macro 1:4.4, without stabilizer, with micro motor [but only for Canon EF-S]. Since December 2007, a micro-motor has also been built into lenses for Nikon (before that, there was no focus motor in the lens). This lens was also produced under the name Quantaray 18-200mm 1: 3.5-6.3 Dio Multi-Coated.
2. Sigma Zoom DC 18-200mm 1: 3.5-6.3 (+ -HSM) OS (Optical Stabilizer) [EF, F, K, SA, A], September 2006, scheme 18/13, velvet (2006) or black (from August 2007) body, macro 1:3.9. The kind of velvet version I have shown here. Nikon cameras only have 'HSM' written on them. For Pentax, Sigma, Sony/Minolta and Canon cameras, the lens comes without the 'HSM' motor. In the Sigma and Canon version, the lens uses a conventional micromotor. Versions for Sony / Minolta and Pentax do not have a built-in image stabilizer (possibly without a built-in focus motor). Versions released after March 2007 differ from earlier versions in that the 'Optical Stabilizer' label is in a different location (to the left of the 'LOCK' button). Individual specimens differ in the structure of the rubber on the zoom ring. Earlier versions have a Sigma velvet case, while newer versions have a classic black one. This lens was also produced under the name Quantaray 18-200mm 1: 3.5-6.3 Dio OS (+ -HSM) Multi-Coated.
3. Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS (Optical Stabilizer) [EF, F, K, SA, A], October 2011, scheme 18/14, with red ring, macro 1:3.8. The Sony/Minolta and Pentax versions do not have a built-in image stabilizer.
4. Sigma DC C 18-200 mm 1:3.5-6.3 Macro OS HSM (Contemporary, Optical Stabilizer) [EF, F, K, SA, A], January 2014, scheme 16/13, macro 1:3. The Sony/Minolta and Pentax versions do not have a built-in image stabilizer.

A line of similar lenses supplemented with super-zooms with a slightly higher zoom ratio:

1. Sigma Zoom 18-250mm 1: 3.5-6.3 DC OS HSM (Optical Stabilizer), January 2009, 18 elements in 14 groups, macro 1:3.4
2. Sigma Zoom 18-250mm 1: 3.5-6.3 DC OS HSM MACRO (Optical Stabilizer), June 2012, 16 elements in 13 groups, macro 1:2.9 (best in series)
3. Sigma 18-300mm 1: 3.5-6.3 DC OS HSM MACRO | C (Contemporary, Optical Stabilizer), September 2014, 17 elements in 13 groups, macro 1:3

Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS

Main technical characteristics of Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS (Optical Stabilizer):

At the time of the release of the Sigma 18-200mm f / 3.5-6.3 II OS HSM, this was the most optically sophisticated lens of its kind. In its optical design, it has as many as 6 specialized optical elements of four different types.

Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS

Assembly

Sigma 18-200mm f / 3.5-6.3 II OS HSM was made in Japan. To the touch the lens is pleasant and weighty. The retractable frame of the body ('trunk') consists of 2 sections, which are quite durable, without any backlash.

The lens has metal bayonet. The zoom ring is rubberized, but there is no focusing ring (ordinary corrugated plastic). Changing the focal length is smooth and comfortable. There is a red decorative ring near the front lens, reminiscent of the red rings of Canon L-lenses.

There is a bayonet mount mark and a mark on the case for quick installation of the hood. The lens uses a plastic hood, which is fixed in special grooves located near the front lens of the lens. The hood can be installed in the opposite direction for transportation. In this position, access to the focus ring at 18 mm focal length is not lost. When you change the focal length, the lens hood moves with the front of the lens.

When changing the focal length, the rear lens moves in the middle of the lens body like a pump - it draws in and pushes out air. This behavior of the rear lens is called 'vacuum cleaner effect', which can increase the amount of dust that accumulates in the camera.

For Sigma 18-200mm f / 3.5-6.3 II OS HSM, the direction of rotation of the zoom and focus rings does not match the direction of the original Nikon DX AF-S 18-200mm 1: 3.5-5.6GII VR.

Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS

Lock 'LOCK ′

Frame (trunk) of the Sigma 18-200mm f / 3.5-6.3 II OS HSM spontaneously changes its size under its own weight (perhaps this begins only with time). For example, when the camera is tilted down, the trunk of the lens spontaneously lengthens (focal length increases). To prevent such an unpleasant incident, there is a focal length switch-lock 'LOCK' (the so-called 'lock') on the lens body, which tightly locks focal length at a value of 18 mm.

To fix the trunk of the lens, you must first set the 18 mm focal length. Near the button there is a drawn arrow that indicates in which direction the switch should be moved to lock the lens.

The switch is located in a convenient place - under the thumb of the left hand, so the lens can be quickly and comfortably 'removed from the lock' before starting shooting.

The effect of a spontaneous change in focal length (trunk creep) in this lens is quite pronounced.

Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS

Stabilizer

Sigma 18-200mm f / 3.5-6.3 II OS HSM has a built-in image stabilizer. Many sources claim that the stabilizer can compensate for 4 steps in shutter speed. According to my observation, the Sigma 18-200mm f / 3.5-6.3 II OS HSM stabilizer compensates for no more than 3 stops by shutter speed. I was able to take pictures with my hands on shutter speed 1/30 - 1/40 sec. and 200 mm focal length. During real shootings, the stabilizer really helps, and the stabilizer itself works well (if you do not take into account some features). I did not notice any tangible improvement in stabilization quality compared to the previous version. Sigma 18-200mm f / 3.5-6.3 OS HSM.

On the case there is a stabilizer operating mode switch 'OS ON / OFF'. Where 'OS' is short for 'Optical Stabilizer'.

The built-in Sigma 18-200mm f / 3.5-6.3 stabilizer can track camera movements while creating panoramas.

The Sigma 18-200mm f / 3.5-6.3 variants for Sony and Pentax cameras do not have a built-in stabilizer, since the stabilizer is already present in the cameras of these manufacturers themselves.

As in the case of Sigma 18-200mm f / 3.5-6.3 OS HSM, the stabilizer of the Sigma 18-200mm f / 3.5-6.3 II OS HSM has its own characteristics. First of all, it seems that the stabilizer is always on, even if the control lever is in the 'OFF' position.

Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS

Focusing

To focus, the lens uses a special ultrasonic focusing motor 'HSM' (Hyper Sonic Motor). Although it is written everywhere that this technology uses silent focusing, in fact, the noise from focusing of the Sigma 18-200mm f / 3.5-6.3 II OS HSM is heard. In general, the lens focuses quite quietly, but not silently.

When used on a camera Nikon D90 with unpretentious Multi-CAM 1000 focusing system the lens behaves well. With precision and clinging focus, I had no particular problems. On camera Nikon D90 I checked the presence of the back and focus front at different focusing distances (infinity and MDF as well). Pictures taken using the Live View mode (which does not suffer from back / front focus) were used as a measure. Focusing accuracy using phase sensors completely coincided with the Live View mode.

Auto focus speed medium (neither high nor low). Repeated refocusing or focusing errors rarely occur, but their number increases with reduced illumination, as well as with the use of the tele-range and side non-cross-shaped focus points.

Focusing on the Sigma 18-200mm f / 3.5-6.3 II OS HSM internal - when focusing, neither the front nor the rear lens rotates, and the lens itself does not change its size when focusing. Sorry, but during auto focus focus ring rotates and cannot be touched. In such Nikon lenses, the focus ring remains stationary during auto focus.

In manual focus mode, the focus ring rotates 60 degrees. Manual focus is very inconvenient. When extreme positions are reached, the focus ring abuts and cannot be rotated further.

The minimum focusing distance is only 45 cm (the distance from the camera’s matrix to the subject). With such an MDF, the maximum magnification ratio is 1: 3.8. Thus, the lens allows you to shoot amateur 'close'. On the retractable frame of the case there are labels indicating the maximum magnification factor for certain focal lengths: 1: 13.1 (28 mm), 1: 10.7 (35 mm), 1: 7.9 (50 mm), 1: 5.6 (80 mm), 1: 4.2 (135 mm), 1: 3.8 (200 mm).

The lens has focus mode switch 'AF / M'. For manual focus, the lens must be switched to 'M' mode, otherwise the focus motor may be damaged. Unfortunately, unlike many Nikon lenses of this type, the Sigma 18-200mm f / 3.5-6.3 II OS HSM does not support continuous manual focus mode.

Focus Features:

• There is a strong effect of 'Focus Breathing' (changing the viewing angle during focusing).
• When changing the focal length, focusing is lost.
• Unknown compatibility with teleconverters.
• Sigma 18-200mm f / 3.5-6.3 II OS HSM does not have hard stop (hard infinity mechanical stop) which allows you to accurately and quickly focus the lens at infinity under any external conditions.
• The lens has a focus distance scale with marks in meters and feet. The scale is plotted on the focus ring. The scale is very meager, on it there are marks for only 5 values ​​of the focusing distance (including 'infinity').
• Focus shift (shift-focus) was not noticed.
• Sigma 18-200mm f / 3.5-6.3 II OS HSM has no focus problems in Live View (tested on Nikon D90 ), but focuses slowly.
• The lens transmits the focus distance to the subject in the camera (analog Nikon D, Nikon G).

Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS

The effect of F / 6.3 on focus

The instructions for most Nikon cameras indicate the threshold for the maximum relative aperture of the lens with which correct auto focus will be available. Most Nikon cameras are designed for lenses only. no darker than f / 5.6. For example, camera Nikon D90, with the help of which test shots were taken, theoretically should not work correctly with this lens. But still, as my practice has shown, in conditions with good lighting there are no special problems with automatic focusing even on cameras that are not designed to work with lenses with F / 6.3.

You can find a list of Nikon cameras whose focus sensors can easily focus with lenses with a maximum aperture of F / 5.6-8.0 here. At the time of writing, there were only three Nikon DX cameras with this feature: D7100, D7200, D500. Most of all, the lateral focus points are sensitive to the lack of aperture. In Live View, the restriction on F / 6.3 may not work.

The same remark applies to cameras from other manufacturers. The difference in aperture between F / 5.6 and F / 6.3 is about a third of the stop.

Small relative aperture - one of the main reasons for possible focus misses and 'jerking' focusing with this lens. I want to note that focusing with the Sigma 18-200mm f / 3.5-6.3 II OS HSM is more tenacious than, for example, with a similar 'dark' and non-motorized lens ProMaster 18-200 / 3.5-6.3.

Third-party manufacturers, so far (at the beginning of 2018), have not made any such super-zoom lens for SLR cameras, which would have at the long end F / 5.6. And here are the original lenses:

• Nikon DX AF-S Nikkor 18-200mm 1: 3.5-5.6 G ED SWM VR IF Aspherical
• Nikon DX AF-S Nikkor 18-200mm 1: 3.5-5.6 GII ED SWM VR IF Aspherical and
• Nikon DX AF-S Nikkor 18-300mm 1: 3.5-5.6 G ED SWM VR IF Aspherical
• Canon Zoom Lens EF-S 18-200mm 1: 3.5-5.6 IS

use on the long end of f / 5.6.

I note that in the range of 18-100 mm, where the relative aperture is greater than F / 5.6, focusing errors are less than in the tele-range, where the relative aperture is from F / 5.6 to F / 6.3.

Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS

Image quality and sample photos

• generally low sharpness / detail on open apertures
• drop in sharpness with increasing focal length, especially in the tele-range
• good sharpness in the wide-angle range in the center of the frame, especially on covered apertures
• weak sharpness and very strong chromatic aberration at the corners and edges of the frameespecially in the TV range
• tangible distortion by 18 mm, while the nature of the distortion is of the same type (either barrel-shaped or pillow-shaped, without a mixed type)
• poor resistance to back / side light in certain conditions. In general, the lens gives a small amount of parasitic glare and flare
• slight vignetting over the entire range of focal lengths, the most vignetting is felt at 18 mm and open apertures
• filters impair vignetting

Important: with this lens on some Nikon cameras are not available distortion control functions.

Camera shots Nikon D90. The photos in the gallery below are shown without processing, conversion of the source RAW files by the original Nikon Capture NX-D utility without any additional adjustments or the source JPEG files.

Original '.NEF' (RAW) photos from the camera Nikon D90 can download from this link (441 Mb). All photos were taken using protective filter Quantaray 62mm QMC-UV Japan.

Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS

Alternatives

Below is a list of all hyper-zooms for SLR or mirrorless cameras with an APS-C sensor and a range of focal lengths greater than or equal to the classic 18-200 mm.

Tamron (different mounts):

1. Model A14 Tamron 18-200/3.5-6.3 AF (IF) Aspherical LD ​​XR DiII Macro, February 2005. Country of manufacture Japan or China. The version for Pentax cameras has a metal mount, for Nikon / Canon / Sony / Minolta the mount is plastic. In March 2008, an improved Tamron Model appears for Nikon cameras. A14 NII with built-in focus motor, focus mode switch, 8 microprocessor pins and metal mount.
2. Model B018 Tamron 18-200/3.5-6.3 AF Di II VCAugust 2015.
3. Model B011 Tamron 18-200 mm F/3.5-6.3 Di III VC, black or silver, December 2011, for mount mirrorless cameras Sony E и Canon EOS M
4. Model A18 Tamron 18-250/3.5-6.3 AF Di II LD Aspherical [IF] Macro, September 2006. Country of origin Japan or China. In December 2007, an improved model appears for Nikon cameras Tamron model A18 NII with built-in focus motor, focus mode switch and 8 microprocessor pins.
5. Model B003 Tamron 18-270/3.5-6.3 AF Di II LD [IF] Aspherical VC MacroJuly 2008.
6. Model B008 Tamron 18-270/3.5-6.3 AF Di II VC PZD, December 2010. Country of origin China or Vietnam.
7. Model B008TS Tamron 18-270/3.5-6.3 AF Di II VC PZDSeptember 2016.
8. Model B016 Tamron 16-300/3.5-6.3 AF Di II VC PZD Macro, February 2014.
9. Model B028 Tamron 18-400/3.5-6.3 Di II VC HLD, June 2017.

Promaster (various mounts):

1. PROMASTER 18-200/3.5-6.3 DIGITAL XR EDO AF Aspherical LD ​​(IF) Macrocopy Tamron model a14 under the Promaster brand. Japanese assembly

Sigma (different mounts):

1. Sigma 18-200 mm/3.5-6.3 Zoom DC, February 2005.
2. Sigma 18-200/3.5-6.3 Zoom DC (+ -HSM) OS (Optical Stabilizer)September 2006 velvet or smooth black body. The HSM motor is only available on Nikon camera lenses.
3. Sigma 18-200/3.5-6.3 II Zoom DC HSM OS (Optical Stabilizer)October 2011.
4. Sigma 18-200/3.5-6.3 DC OS HSM MACRO | C (Contemporary, Optical Stabilizer), January 2014.
5. Sigma 18-250/3.5-6.3 Zoom DC HSM OS (Optical Stabilizer)January 2009
6. Sigma 18-250/3.5-6.3 Zoom DC Macro HSM OS (Optical Stabilizer)June 2012.
7. Sigma 18-300/3.5-6.3 DC OS HSM MACRO | C (Contemporary, Optical Stabilizer)September 2014.

Quantaray (different mounts):

1. Quantaray 18-200/3.5-6.3 Dio Multi-Coated, copy of Sigma 18-200mm/3.5-6.3 Zoom DC (2005) branded as 'Quantaray'
2. Quantaray 18-200/3.5-6.3 Dio OS (+-HSM) Multi-Coated, copy Sigma 18-200/3.5-6.3 Zoom DC (+-HSM) OS (2006) under the banner of 'Quantaray'.

Nikon (F):

1. Nikon 18-200/3.5-5.6G DX VRNovember 2005.
2. Nikon 18-200/3.5-5.6GII DX VRJuly 2009.
3. Nikon 18-300/3.5-5.6G DX VR, June 2012.
4. Nikon 18-300/3.5-6.3G DX VRApril 2014.

Sony ('A' or 'E'):

1. Sony 18-200/ 3.5-6.3 AF DT, A mount, most likely uses an optical design Tamron model a14.
2. minolta 18-200/3.5-6.3AF DT Dmount A is likely to use an optical circuit Tamron a14
3. Sony 18-250/3.5-6.3 AF DT, A mount, since 2007, most likely uses Tamron Model A18 optical design.
4. Sony 18-200/3.5-6.3 OSS, E-mount, May 2010
5. Sony 18-200/3.5-6.3 OSS LE, E-mount, May 2012
6. Sony 18-200/3.5-6.3 PZ OSS, E-mount, September 2012

Hasselblad (Sony E):

1. Hasselblad E 3.5-6.3/18-200 OSS copy Sony 18-200/3.5-6.3 OSS, September 2012

Pentax (K):

1. Pentax 18-250/3.5-6.3 AL SMC DA [IF], October 2007, most likely uses Tamron Model A18 optical design.
2. Pentax 18-270/3.5-6.3 ED SMC DA SDM, September 2012, most likely uses an optical design Tamron model b008.
3. Samsung 18-250/ 3.5-6.3, with a Pentax KAF2 mount, 2008, (most likely uses the Tamron Model A18 optical design.

Canon (EFS):

1. Canon 18-200/3.5-5.6 IS Zoom Lens EF-S (Image Sbabilizer), August 2008.

Samsung (NX):

1. Samsung 18-200/3.5-5.6 ED OIS i-Function, Samsung NX mount

Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS

My experience

Sigma 18-200mm f / 3.5-6.3 II OS HSM is another branch in the development of superzoom from Sigma. In fact, this is the third iteration of such a lens. If about the previous version Sigma 18-200mm f / 3.5-6.3 OS HSM I didn’t respond very flatteringly, I liked the second version of Sigma 18-200mm f / 3.5-6.3 II OS HSM a little more. But still Sigma 18-200mm 1: 3.5-6.3 DC OS HSM MACRO | C (Contemporary, Optical Stabilizer) is a more interesting option and by and large is even preferable over the original similar Nikon Nikkor lenses.

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Two similar lenses: Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS and PROMASTER DIGITAL XR EDO AF Aspherical LD ​​(IF) 18-200mm 1: 3.5-6.3 Macro

Results

Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS - classic hyperzoom, modified version of the lens of the previous generation - Sigma 18-200mm f / 3.5-6.3 OS HSM... In general, Sigma Zoom DC 18-200mm 1: 3.5-6.3 II HSM OS is a relatively affordable and functional super-zoom for crop cameras, the lens deserves attention and can be a replacement for the original and older Nikon DX AF-S 18-200mm 1: 3.5-5.6GII VR.

Advantages:

1. high zoom ratio of 11.11 X
2. many special optical elements in the optical scheme, including the rare Sigma FLD
3. built-in image stabilizer with switch
4. compact size, light weight, small diameter of light filters
5. lock for fixing the lens in position 18 mm
6. a very convenient set of focal lengths (at the same time 18 mm for a wide angle and 200 mm for a television range)
7. zoom ring rubberized, bayonet type hood with the ability to install the reverse side
8. small MDF with a good maximum magnification ratio of 1: 3.8
9. focus type internal
10. no focus shift
11. ultrasonic and fairly quiet built-in focus motor
12. fairly flat discs of blur due to 7 blade aperture at open and average apertures
13. confident sharpness on covered apertures in the center of the frame over almost the entire range of focal lengths
14. good sharpness in the center of the frame in the wide angle already at full aperture
15. 2012 TIPA Award for Best CZK Amateur Lens

Disadvantages:

1. low aperture, very few Nikon DX series cameras support normal focus with F / 6.3
2. incomprehensible logic of the stabilizer (found in some other Sigma lenses)
3. lack of a protective O-ring near the mount and the absence of any dust and moisture protection
4. trunk extension under its own weight
5. low speed auto focus
6. inconvenient manual focusing due to the small stroke of the focus ring, the focus ring rotates approximately 60 degrees, the ring is plastic, not rubberized
7. movement of the rear lens while changing the focal length, tangible effect of a vacuum cleaner / air pump
8. focusing accuracy is lost while changing the focal length
9. rotation of the focus ring during autofocus and, as a result, lack of the function of constant manual focus control
10. the direction of rotation of the zoom and focus rings does not match the original lens Nikon DX AF-S 18-200mm 1: 3.5-5.6GII VR, which may result in discomfort when using other genuine Nikon Nikkor lenses
11. strong effect of 'Focus Breathing' (changes in viewing angle during focusing).
12. there may be incompatibility with some cameras and / or teleconverters (no exact data)
13. lack of a switch for selecting stabilizer operating modes, which, for example, a similar one has Nikon DX AF-S 18-200mm 1: 3.5-5.6GII VR
14. TV drop in sharpness
15. tangible distortion by 18 mm, while the nature of the distortion is of the same type (either barrel-shaped or pillow-shaped, without a mixed type)
16. slight vignetting at open apertures over the entire range of focal lengths, especially noticeable at 18 mm and F / 3.5
17. the main disadvantage in image quality is poor sharpness and very strong chromatic aberration at the corners and edges of the frame, especially in the television range
18. poor resistance to back / side light under certain conditions
19. nut-shaped blur discs on heavily covered diaphragms, bulbous bokeh
20. lack of data about the lens in modern cameras, which makes it difficult to automatically correct some types of distortion (distortion etc.)

Material prepared Arkady Shapoval. Training/Consultations | Youtube | Facebook | Instagram | Twitter | Telegram