Lens comparisons
Oct 21, 2017 09:36:52 #
I have taken pictures with two lenses I have. A Tamron 17 to 50 2.8 without image stabilization and a 18 to 50 Canon kit lens with stabilization. I have two pictures of the same fall leaf and find the image from the Canon to have more detail than the one from Tamron. There is a major difference in price in these lenses and I thought the Tamron would produce better results. Both images at AV 4.0.
Does the image stabilization produce the better results. Here are the images. I am not sure why the EXIF data is not with the image.
Does the image stabilization produce the better results. Here are the images. I am not sure why the EXIF data is not with the image.
Oct 21, 2017 09:42:14 #
First it would be good to shoot them at the same focal length. I'm also not sure the aperture is the same. Neither appears blurred, so it has nothing to do with image stabilization. The only thing that I can say is that the Tamron seems to have more chromatic aberration, but until we have images that are more identical (including exposure) it is hard to say more.
Oct 21, 2017 10:06:56 #
kymarto wrote:
First it would be good to shoot them at the same focal length. I'm also not sure the aperture is the same. Neither appears blurred, so it has nothing to do with image stabilization. The only thing that I can say is that the Tamron seems to have more chromatic aberration, but until we have images that are more identical (including exposure) it is hard to say more.
The exif in the downloads show the Tammy shot was at 17mm 1/200s, the Canon at 21mm 1/160s; both at f/4 which I would think would be way too large an aperture to get good focus across the leaf. I think all that can be said based on these is that the Canon at 21mm produced a better image at close focusing distance than the Tamron did at 17mm.
Oct 21, 2017 11:22:03 #
A rather unscientific comparison as already noted by others. In "your hands" since a tripod was not used, yes, the IS-enabled lens clearly makes a difference. There's nothing in sharp focus in the top leaf .... If attempting a valid comparison, it also would have helped to create a valid comparison if you'd set your focus points on the exact same areas of the leaf ...
Oct 22, 2017 06:07:04 #
Oct 22, 2017 06:30:05 #
tarsen wrote:
I have taken pictures with two lenses I have. A Ta... (show quote)
DIY comparisons are very difficult to do well. The pros use lots of equipment and exacting standards when comparing similar products. That's why I rely on multiple reviews and comparisons before buying anything.
Oct 22, 2017 08:00:51 #
tarsen wrote:
I have taken pictures with two lenses I have. A Ta... (show quote)
The EXIF data clearly shows that the exposures are different. This affects detail as well.
Oct 22, 2017 08:37:34 #
You need to shoot both at the same exposure and most importantly at the same focal length. There is often a large difference in performance in a lens between its extreme wide setting and somewhere in the middle. For comparison shoot both at 18mm, or at 21mm, but not one at 17 and the other at 21.
Oct 22, 2017 10:17:11 #
When I looked at both images I zoomed in almost as far as possible (using Preview) and I find the Canon lens to have much more detail than the Tamron. Is that a valid assessment of these pictures? Maybe I should re-shoot with all the same including the light.
Oct 22, 2017 11:56:03 #
tarsen wrote:
When I looked at both images I zoomed in almost as far as possible (using Preview) and I find the Canon lens to have much more detail than the Tamron. Is that a valid assessment of these pictures? Maybe I should re-shoot with all the same including the light.
Rather than how, let's ask what you're trying to do?
Oct 22, 2017 13:33:42 #
The difference is not in IS. You've probably metered the two exposures differently, since the two images do not include the same matter. In one image, for example, the leaf occupies a much greater proportion of the field, so, if you were not spot-reading it for exposure, the leaf may have played a greater part in determining exposure, making it appear lighter on the surround (with is higher in value).
If you want to reply, then register here. Registration is free and your account is created instantly, so you can post right away.