Re: [pinhole-discussion] Angle of projection
Guillermo, Thank you for your incredibly rapid response. This is exactly what I needed. Michael -- On Sat, 19 Apr 2003 11:00:11 Guillermo wrote: - Original Message - From: p g crd...@lycos.com Is there a simple formula, for the mathematically challenged, to calculate the light's angle of projection relative to the plane of an orifice as diagramed below? For the Lenox's Pinhole Competition, the camera is designed with multiple adaptors to reposition the disc to other locations using 1/2 interior diameter PVC fittings. I want to calculate how far below the 0.585 mm aperture the fitting can extend without protruding into the image's projection. Using this hardware the fittings will need to extend 10-12 mm below the disc. Will this work, or do I need to change the design? P.G: Your pinhole, if it is mounted right at the center of the fitting and if the fitting extend 12mm bellow the pinhole, will project an unobstructed cone of light of about 90 degrees (93.246 to be more exact). Will it work or do you need to change the design? It will as long as your camera is made with a focal length not shorter than half the diagonal of the format you are using. If you need shorter focal length than half the diagonal of the format, just use a fitting with a larger I.D. For math challenged, the best is to make a scale diagram on paper. Forgot the formulas, tell me if you really need them. Guillermo ___ Post to the list as PLAIN TEXT only - no HTML Pinhole-Discussion mailing list Pinhole-Discussion@p at ??? unsubscribe or change your account at http://www.???/discussion/ Get advanced SPAM filtering on Webmail or POP Mail ... Get Lycos Mail! http://login.mail.lycos.com/r/referral?aid=27005
Re: [pinhole-discussion] Angle of projection
- Original Message - From: p g crd...@lycos.com Is there a simple formula, for the mathematically challenged, to calculate the light's angle of projection relative to the plane of an orifice as diagramed below? For the Lenox's Pinhole Competition, the camera is designed with multiple adaptors to reposition the disc to other locations using 1/2 interior diameter PVC fittings. I want to calculate how far below the 0.585 mm aperture the fitting can extend without protruding into the image's projection. Using this hardware the fittings will need to extend 10-12 mm below the disc. Will this work, or do I need to change the design? P.G: Your pinhole, if it is mounted right at the center of the fitting and if the fitting extend 12mm bellow the pinhole, will project an unobstructed cone of light of about 90 degrees (93.246 to be more exact). Will it work or do you need to change the design? It will as long as your camera is made with a focal length not shorter than half the diagonal of the format you are using. If you need shorter focal length than half the diagonal of the format, just use a fitting with a larger I.D. For math challenged, the best is to make a scale diagram on paper. Forgot the formulas, tell me if you really need them. Guillermo
[pinhole-discussion] Angle of projection
Is there a simple formula, for the mathematically challenged, to calculate the light's angle of projection relative to the plane of an orifice as diagramed below? I I I I For the Lenox's Pinhole Competition, the camera is designed with multiple adaptors to reposition the disc to other locations using 1/2 interior diameter PVC fittings. I want to calculate how far below the 0.585 mm aperture the fitting can extend without protruding into the image's projection. Using this hardware the fittings will need to extend 10-12 mm below the disc. Will this work, or do I need to change the design? Get advanced SPAM filtering on Webmail or POP Mail ... Get Lycos Mail! http://login.mail.lycos.com/r/referral?aid=27005
