IQ180 diffraction?

Questions, comments and suggestions regarding Phase One IQ4, IQ3, IQ2 and IQ1 series digital camera backs.

IQ180 diffraction?

Postby NNN635093227738883888 » Mon Apr 27, 2015 1:53 pm

Hi ,I'm planning to purchase an IQ 180 and have become aware of diffraction issues especially around f16-and smaller. I am shooting table top still lifes and require depth of field, I'm usually around 5 feet from subject and subject is 12 inches deep . I'm using a Mamiya AF with 80 mm Sekkor lens. I currently use a P45 back. Any knowledge about this is welcome. thanks ,Max
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Re: IQ180 diffraction?

Postby flashsplash » Thu Jul 02, 2015 7:36 pm

Diffraction is a lens issue, and not a back issue. Decrease your focal lenght for more depth of field and use the sweet spot of your lens ( typical around F11 pending the lens).
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Re: IQ180 diffraction?

Postby Christian Gruner » Thu Jul 09, 2015 1:05 pm

NNN635093227738883888 wrote:Hi ,I'm planning to purchase an IQ 180 and have become aware of diffraction issues especially around f16-and smaller. I am shooting table top still lifes and require depth of field, I'm usually around 5 feet from subject and subject is 12 inches deep . I'm using a Mamiya AF with 80 mm Sekkor lens. I currently use a P45 back. Any knowledge about this is welcome. thanks ,Max


Remember that diffraction is not something that suddenly appears, but something that gradually appears.

You can see the effects of diffraction here (and how remedy the loss of contast): https://phaseoneimageprofessor.wordpres ... rity-tool/

With regards to the loss of sharpness, at very aperture values, your best solution is tilting the lens, really. Either using our SK 120 mm TS lens ( https://www.phaseone.com/en/Products/Ca ... mm-TS.aspx ) or mounting the IQ180 on a technical camera (will give you ultimate control and extremely sharp and crisp images).

Decreasing the focal length (and maintaining the same magification) will not help, as the DOF will remain the same. And decreasing the focal length without moving the camera close will just loose a lot of pixels to cropping.
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