Images may appear blurry even when f stop is at F22

I bought the Canon SL1 with the standard 18-55mm IS. I am having some problems with the update. I can't attach the picture of this post to show you... But here's a description: the lower part looks a little blurry; in fact, the rest of the photo is too (but especially if I have much zoom in several times I found it). Image stabilization is enabled. Italy snow photo is F22, 80 (hand-held) ISO 100 speed. With this F stop, I expect 100% objective. It was not windy. Even when I use a tripod and the speed is faster (125 +) I have this problem to varying degrees. This could be the cause? I would appreciate any thoughts! I realize without seeing photos, you may not be able to help me, but thought I'd try! Thank you and happy holidays, Annie

amatula wrote:

Thank you! It's all very useful.

I just found how to post pictures. Here are two. Note: both I used an older Sunpack UV filter. Both were at hand.
The parameters were:

Barn: ISO 200 F16 125 manual

Other ISO 100 F22 80 manual snow scene mode (wind was not blowing, but note that the snow on the bottom of the picture appears blurred)

Dosage for the two - Center weighed

Picture style: standard

Large/fine image quality

I have other photos without the filter that have the same problem with sharpness not total throughout the picture.

With all the pictures, I have the camera set to 18 mm

I think buy the 2.8 lens or a 1.8 but just want to be sure I can photograph this first goal successfully.

Yet once, I really appreciate the help - I don't remember these problems with my old Nikon film SLR; Therefore, a new learning experience for me!

Annie

Buying a lens f/1.8 or f/2.8 will do nothing to help your images because the question is that you are using too small of an opening (too high f/number).

Something from a film camera to a digital camera APS - C, you need to understand is that all openings you are using shift by one f-stop. So f/16 on your digital Rebel will give you the same depth of field to use f/22 on a film camera. And it goes the same for diffraction f/22 on your rebel gives you the same amount of diffraction to use f/32 on your film camera.

Diffraction sets in at the beginning when you use an APS - C sesnor. An optimal sharpness with your lens at 18mm is at f/5.6 and stop after that diffraction more impact on the photo and becomes less sharp your image. So it becomes a balancing act between the maximum sharpness and an adequate depth of field.

Angles more wide lenses have a very large depth of field. I would suggest to 18mm, you try to use f/8. Still, this gives a very large depth of field to about 4 ft to infinity and reduce diffraction as a factor in the sharpness of your image.

You can also try to use the picture style 'Landscape', because it gives a bit more sharpening.

Edit: I also would try to support the distance of your update until you get more comfortable with the performance of your new equipment. (e.g. support 5 shots with emphasis varying between 5 feet and 1/3 of the way in the photo) Unlike with film it costs you nothing but time.

Tags: Canon Camera

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