- 24X36
- FIL.82
- NAH:20
- ABB:1:4
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Product Description
Sigma EX 1,8/20 DG C/AF for Canon aspherical RF
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Customer Reviews
Most Helpful Customer Reviews
3 of 3 people found the following review helpful
I have one of these and I'm very happy with it. It's an ex lens and as such it's full frame compatible however it remains useable on an APS-C digital SLR camera on which it'll be the equivalent of 32mm assuming a "crop" factor of x1.6.
The lens lacks HSM however the focus ring can be pushed forward thus avoiding accidental damage when in AF mode. I think that this is a nice touch but that the lens would be even better with HSM.
Whilst the widest aperture setting of f1.8 doesn't produce the sharpest of images it may prove useful for low light or creative DOF shots and as this lens is possibly best suited for landscape use at narrower apertures I think that a little softness at f1.8 shouldn't detract from the usability of the lens at all. In my view a maximum aperture of f1.8 is nice to have but isn't or shouldn't be the main reason for buying the lens.
All in all I'm very happy with this lens, HSM would be nice, but it's still a very nice and useable lens without it.
The lens lacks HSM however the focus ring can be pushed forward thus avoiding accidental damage when in AF mode. I think that this is a nice touch but that the lens would be even better with HSM.
Whilst the widest aperture setting of f1.8 doesn't produce the sharpest of images it may prove useful for low light or creative DOF shots and as this lens is possibly best suited for landscape use at narrower apertures I think that a little softness at f1.8 shouldn't detract from the usability of the lens at all. In my view a maximum aperture of f1.8 is nice to have but isn't or shouldn't be the main reason for buying the lens.
All in all I'm very happy with this lens, HSM would be nice, but it's still a very nice and useable lens without it.
Most Helpful Customer Reviews on Amazon.com (beta)
Amazon.com:
13 reviews
32 of 35 people found the following review helpful
AMAZINGLY SHARP AND FAST SUPER-WIDE ANGLE
7 May 2006
I have used this lens extensively with the 1D and the Rebel XT. Results have been excellent. My suspicion is that the previous reviewer got a defective or damaged copy of the lens. It is incredibly sharp, even at f1.8, which I did not expect - generally you expect a lens to be a bit soft wide open, especially 1.8. The degree of sharpness of this lens is quite surprising.
I have used, for example, both the Canon 50mm f1.8 and the Canon 35mm f2.0, both of which are deservedly renowned for their sharpness and contrast. I find this lens to be sharper than either of them wide open. The lens provides images which have excellent color saturation and contrast. Of course, at f1.8, depth of field is razor thin, by design, which is great for bokeh or out of focus background, but which also requires care concerning the desired focal point being in focus. Speaking of bokeh, I find it to be very attractive compared to any other lens I have used.
Its minimum distance focusing is also quite remarkable. I think it is rated at just under 8 inches, but I routinely focus at distances which seem a good bit closer than that. The lens works well as a macro for many applications, with a relatively strong multiplication factor.
Of course, given the inherent light-gathering of a 20mm focal length lens, combined with a huge aperture of f1.8, this lens is outstanding for shooting indoors or in other low-light situations with natural light and no flash.
Canon's nearest competitor to this lens is the 20mm f2.8, which is a full stop slower in terms of light collection. I consider this lens to be an extremely good value at the retail price, new. If you can get a good copy used on-line, it will be an incredible value. You may find that you never want to take the lens off the camera because of its versatility as a walkaround lens.
This lens has been extremely well-reviewed, by and large, on lens forum sites. I encourage you to check those out. Most people rate the lens 5 out of 5. A distinct minority give it 1 out of 5. I suspect that they either have defective copies which may need repair, or they have inaccurate perceptions of the lens. Also, popular photography magazine online reviewed this lens, as well as the 24 f1.8 and the 28 f1.8, very highly.
I would highly recommend this lens to anyone who wants a fast, sharp superwide angle lens.
I have used, for example, both the Canon 50mm f1.8 and the Canon 35mm f2.0, both of which are deservedly renowned for their sharpness and contrast. I find this lens to be sharper than either of them wide open. The lens provides images which have excellent color saturation and contrast. Of course, at f1.8, depth of field is razor thin, by design, which is great for bokeh or out of focus background, but which also requires care concerning the desired focal point being in focus. Speaking of bokeh, I find it to be very attractive compared to any other lens I have used.
Its minimum distance focusing is also quite remarkable. I think it is rated at just under 8 inches, but I routinely focus at distances which seem a good bit closer than that. The lens works well as a macro for many applications, with a relatively strong multiplication factor.
Of course, given the inherent light-gathering of a 20mm focal length lens, combined with a huge aperture of f1.8, this lens is outstanding for shooting indoors or in other low-light situations with natural light and no flash.
Canon's nearest competitor to this lens is the 20mm f2.8, which is a full stop slower in terms of light collection. I consider this lens to be an extremely good value at the retail price, new. If you can get a good copy used on-line, it will be an incredible value. You may find that you never want to take the lens off the camera because of its versatility as a walkaround lens.
This lens has been extremely well-reviewed, by and large, on lens forum sites. I encourage you to check those out. Most people rate the lens 5 out of 5. A distinct minority give it 1 out of 5. I suspect that they either have defective copies which may need repair, or they have inaccurate perceptions of the lens. Also, popular photography magazine online reviewed this lens, as well as the 24 f1.8 and the 28 f1.8, very highly.
I would highly recommend this lens to anyone who wants a fast, sharp superwide angle lens.
7 of 7 people found the following review helpful
Sigma 20 mm for Astrophotography
16 Aug 2010
Amazon Verified Purchase
I purchased the Sigma 20mm f/1.8 lens, mainly for wide field astrophotography purposes. I refuse to pay what Canon was asking for a comparable lens...this Sigma lens costs less than half of what Canon charges. I can tell you the quality is top notch - well built, very sharp images across the field, easy to use and transport. The two issues I knew about before purchase - the autofocus is a bit rough and noisy compared to the Canon and you have to engage the focus ring for manual focussing - were no surprise, and really not much in the way of issues anyway. The autofocus with the Sigma is a bit noisier than the smooth Canon lens, and is remembering to move the focus ring when manually focusing really a hassle? Some reviewers made it sound horrible, but for saving over $500 I will put up with a little noise and a focus ring......
I captured some fanstastic shots of the Perseid meteor shower while camping at Joshua Tree in early August - the Sigma performed flawlessly. I recommend this lens without reservation.
I captured some fanstastic shots of the Perseid meteor shower while camping at Joshua Tree in early August - the Sigma performed flawlessly. I recommend this lens without reservation.
5 of 5 people found the following review helpful
A Great Lens for low light Photo and HD Video
6 Nov 2010
Amazon Verified Purchase
This lens has been out on the market for almost ten years. The current version on amazon is different, at least on the outside, from previous ones. I don't know if there is a difference in performance, but I find the lens to be fairly sharp even at wide open. It seems recent feedbacks and reviews are more positive than in the past.
Anyway, this is a perfect lens for crop sensors, especially for doing HD video indoor. As you may know if you want less than 22mm on a crop sensor(or 35mm on 35mm equivalent)and fast (less than 2.5), for low light, then this is IT, no other choice on the market.
Fortunately, this lens performs very well, better than what many old reviews would have you believe. I think most people will be happy to have this powerful lens in their bag, for situations that all the other lenses on the planet simply cannot deliver.
Anyway, this is a perfect lens for crop sensors, especially for doing HD video indoor. As you may know if you want less than 22mm on a crop sensor(or 35mm on 35mm equivalent)and fast (less than 2.5), for low light, then this is IT, no other choice on the market.
Fortunately, this lens performs very well, better than what many old reviews would have you believe. I think most people will be happy to have this powerful lens in their bag, for situations that all the other lenses on the planet simply cannot deliver.
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