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Some help with my new 10-18mm IS STM please?

Started Dec 7, 2016 | Discussions thread
Steve Balcombe Forum Pro • Posts: 15,582
Re: Some help with my new 10-18mm IS STM please?

trulandphoto wrote:

bent christian wrote:

Looking at the two full-resolution photos, I can't find anything in focus. Absolutely nothing. The issue appears to be something other than than diffraction at f/11. Diffraction would be minimal at this aperture in a crop sensor.

Like I said, diffraction starts on this sensor at f/5.9 at normal focal lengths. super wide like this would be even larger aperture.

Some areas would still show focus.

"focus" and softness are different things but can be confused. Diffraction results in softness. At 10mm and f/11 on a crop sensor you could almost focus anywhere and the entire shot is "in focus."

The fact that you don't see anything "in focus" indicates it's not a focus issue.

It is definitely a focus issue, see my other response.

BTW - diffraction softness is certainly visible at f/11 on a crop body, but it wouldn't make an image as soft as these. I use f/11 sparingly, but when I have to use it I get good enough results.

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