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08/11/2005 06:36:06 PM · #1 |
I have a 105mm Macro EX DG. I don't have much experience in macro photography. So I was wondering: what is the smallest apperture that I can use withought loosing image qualaty? Becase sometimes I put my D70 in shutter priority in order to don't get blurry images due to camera shaking (most times at 1/160 sec.). Some photos look very crisp but when I see them at full size it gets not so crisp and a bit noisy. Here's an example
It was shoot raw, opened in Capture 4.1 and exported to PS in 16bit and this is a 100% crop of the dragonfly. Don't you think it's a bit noisy( iso 500 to get high dof)? Should I get higher shutter speed to compensate subject moving?
Any thoughts?
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08/11/2005 06:45:47 PM · #2 |
I have seen brilliant work at F32.
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08/11/2005 06:50:13 PM · #3 |
What's the smallest aperture that the lens is capable of? Experiment. You'll probably find that (depending on the lens of course) that the smallest aperture doesn't produce the best results. Experimentation is in order, me thinks.
BTW, iso doesn't affect the DOF. Primarily aperture and to a lesser extent focal length and distance to the subject will affect aperture.
Message edited by author 2005-08-11 18:51:21.
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08/11/2005 07:21:39 PM · #4 |
If I want a reasonably deep dof on my Canon 100 f2.8 macro lens I will stick it on f32, but then I have to give it 'plenty' of light using the flash.
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08/11/2005 07:23:56 PM · #5 |
You can calculate the smallest aperture you can safely use without negatively effecting image quality (because of diffraction) using the form at the end of this web page. Be sure to read through the explanation... and mouse-over the camera model (to change the grid size) and aperture (to change the size of the airy disk) in the "VISUAL EXAMPLE: APERTURE VS. PIXEL SIZE" section to help visualize diffraction effects.
Message edited by author 2005-08-11 19:33:28.
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08/11/2005 07:31:12 PM · #6 |
Originally posted by EddyG:
You can calculate the smallest aperture you can safely use without negatively effecting image quality (because of diffraction) using the form at the end of this web page. Be sure to read through the explanation... and mouse-over the camera model (to change the grid size) and aperture (to change the size of the airy disk) in the "VISUAL EXAMPLE: APERTURE VS. PIXEL SIZE" section to help visualize diffraction effects. |
Wow, how and where do you find these sites Eddy??? Pretty cool! |
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08/11/2005 07:34:04 PM · #7 |
If you need the DOF you need to deal with the diffaction and that's that.
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08/11/2005 07:38:04 PM · #8 |
Originally posted by kyebosh:
If you need the DOF you need to deal with the diffaction and that's that. |
I think is is worth mentioning. Quoting from the referenced web page: "Since photographers pursuing better sharpness use smaller apertures to achieve a greater depth of field, at some aperture the softening effects of diffraction offset any gain in sharpness due to better depth of field." (emphasis mine)
P.S. Nick: glad you like the link :)
Message edited by author 2005-08-11 19:39:00. |
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08/11/2005 07:42:19 PM · #9 |
Originally posted by EddyG:
Originally posted by kyebosh:
If you need the DOF you need to deal with the diffaction and that's that. |
I think is is worth mentioning. Quoting from the referenced web page: "Since photographers pursuing better sharpness use smaller apertures to achieve a greater depth of field, at some aperture the softening effects of diffraction offset any gain in sharpness due to better depth of field." (emphasis mine)
P.S. Nick: glad you like the link :) |
That doesn't hold true for macro photography because you can have half the bug in focus at F16, and maybe at F32 you might have the whole thing. Sure it will be a little softer, but you'll at least have the whole thing in focus. That quote doesn't say that the DOF doesn't become deeper... it says that the stuff in focus will be less sharp. Often the reason we see things as soft are because they're out of focus. This is what that quote says, and my statement still holds.
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