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Forum: Troubleshooting and Beginner Help 02-07-2013, 02:33 PM  
Sigma 50mm f/2.8 EX DG Macro infinity focus issue
Posted By pacopentax
Replies: 6
Views: 2,326
I have been testing the lens again today in AF, MF with and without the focus limit.

I got very sharp pictures in MF, and also in AF, but some blurred ones with AF only.

I think the problem is caused by the AF. The lens has a beyond infinity position and I guess that the AF sometimes uses this set when you try to focus the horizon or the clouds. The result is a quite blurred image.

So, if you use this lens, I recomend MF when focusing to the infinity. Also, it is better to use a small aperture like F8 or smaller.

Hope this helps.
Forum: Troubleshooting and Beginner Help 02-06-2013, 03:43 PM  
Sigma 50mm f/2.8 EX DG Macro infinity focus issue
Posted By pacopentax
Replies: 6
Views: 2,326
Hi Bronmar

I have just bought that lens today and in my first 100 shots I have noticed the same problem you mention here. The photos are great at close range, but look awful at longer distance. I dont think that the lens is supposed to have such a bad performance with distant objects... ANY compact camera will look better than that!

However, the image does look perfectly sharp thru the finder at any distance.

I was wondering if the lens is defective, or there is a issue with the focus limit, or may be caused by the UV filter... Tomorrow I will try to shot without the filter, and without the limit... I will tell you what I find
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