DPReview.com is closing April 10th - Find out more

Unsharp pictures with 7D and EFS 17-55mm, F2,8. Peter, Copenhagen

Started Nov 1, 2012 | Discussions thread
Sovern Contributing Member • Posts: 907
Re: Unsharp pictures with 7D and EFS 17-55mm, F2,8. Peter, Copenhagen

Yea, 2.8 is a very narrow DOF, you need to literally almost instantly take the picture after obtaining focus of your subject if you want a sharp picture or else your subject will be soft when viewed at 100%.

Even with my 50 1.8 I had to step down to 3.2-3.5 before getting razor sharp images when zoomed in 100%, you still get very nice bokeh at 3.2-3.5 especially when zoomed in at 50mm.

This applies to any lens, I'd say anything at 2.8 and under is extremely thin depth of field wise and should be used with care or if the lighting permits using that low of an aperture.

Also, the longer your focal range the thinner your plane of focus is going to be regarding your aperture. I know that I can get 100% zoomed in tack sharp images at 2.8 without much trouble at 17mm but once zoomed in it at 50mm it can be much more difficult as your plane of focus is decreased due to the perceived distance between your subject and the background.

Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow