Digital ZP-IR

[DRC]

I picked up a Canon EOS zone plate cap made by Pinhole Resource for pretty cheap via APUG. It's been sitting on my desk for quite some time, but yesterday was a good infrared day (sunny, lots of clouds) so I put it on my IR-converted Canon 5D and gave it a try:

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[Jimmy G]

Hi Dave,
Have you tried the ZP in normal...ie non IR... I've found the pinhole resource ZP to be very sharp and detailed so I'm wondering if the focus shift due to IR applies here. I've done some film IR with ZP and found them very soft whereas non ir were very sharp. It'd be interesting to do some experiments to find where your zP focuses....

[DRC]

Hi Dave,
Have you tried the ZP in normal...ie non IR... I've found the pinhole resource ZP to be very sharp and detailed so I'm wondering if the focus shift due to IR applies here. I've done some film IR with ZP and found them very soft whereas non ir were very sharp. It'd be interesting to do some experiments to find where your zP focuses....

I have not yet tried the ZP with a regular digital camera, but I will do so. I found these especially soft, but it didn't occur to me that the focal difference for IR might be the culprit. I'll let you know what I find out.

[europan]

Wouldnt it be best to fabriquate a ZP in the FL where one can mount on a very thin helicoid and then find out how to adjust?
skinkfoto has a set of pinhole, ZP, Zsieve. he told ZP and ZS must match exactly.