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thommitch
Joined: 03 Jan 2002
Posts: 2
Location: Boston
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 Posted: Fri Mar 15, 2002 4:41 am Post subject: |
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I have been bitten by the pinhole bug and was wondering if anyone has any experience making and using pinholes on a Crown? I have the 127 lens but I would like a wide-angle pinhole and/or a tele-pinhole. How would I zero in the pinhole for it's appropriate focal length? ( I.E a pinhole that is a 90mm focal length or a 300mm focal length) Also what is the longest/shortest pinhole that one could use on a crown? Any advice would be appreciated.
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Les
Joined: 09 May 2001
Posts: 2682
Location: Detroit, MI
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| Posted: Fri Mar 15, 2002 1:18 pm Post subject: |
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Pinholes don't have a focal lenght, but for a given focal length you can have an optimal size hole. Optimized holes aren't necessarily what's used as it gives you the sharpest image, and there are much easier ways of doing that. I suggest you look at
http://www.pinhole.com
zone plates are another odditiy, giving you the eitherial look of a pinhole but with an 8 stop gain, these you do have to focus. |
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Les
Joined: 09 May 2001
Posts: 2682
Location: Detroit, MI
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| Posted: Fri Mar 15, 2002 1:19 pm Post subject: |
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Pinholes don't have a focal lenght, but for a given focal length you can have an optimal size hole. Optimized holes aren't necessarily what's used as it gives you the sharpest image, and there are much easier ways of doing that. I suggest you look at
http://www.pinhole.com
zone plates are another odditiy, giving you the eitherial look of a pinhole but with an 8 stop gain, these you do have to focus. |
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