Can a Delta series projection lens be mounted?

eebasist · 28th June 2002, 06:51 PM

Can you mount a delta series projection lens about 1-2 feet away from a LCD panel. I know they are designed for a 5 or 7 inch crt panel up close, but is it possible to use one of these that far from the lcd to project the image......i want to get as much usable light and these have huge aperatures and are quite cheap and of high quality.

xblocker · 28th June 2002, 09:27 PM

eebasist,
there are some optical laws: size of panel and focal lenght of an objective are related on themselves. Objective's FL should have minimum the diagonal size of the panel or you won't see the whole image!

xblocker

eebasist · 28th June 2002, 09:45 PM

Thank you, that means some of those delta series lenses arent big enough since they are ~60mm. So i need a lens with a focal length of at least 250mm (254) for a 10in diagonal lcd?

xblocker · 29th June 2002, 10:32 PM

correct,
a lot of people with 10" panels use an OHP lens triplet (f~320mm), which is a corrected objective for spherical abberations.

xblocker

28th June 2002, 06:51 PM	#1
eebasist diyAudio Member Join Date: Apr 2002	Can a Delta series projection lens be mounted? Can you mount a delta series projection lens about 1-2 feet away from a LCD panel. I know they are designed for a 5 or 7 inch crt panel up close, but is it possible to use one of these that far from the lcd to project the image......i want to get as much usable light and these have huge aperatures and are quite cheap and of high quality.

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28th June 2002, 09:27 PM	#2
xblocker diyAudio Member Join Date: Dec 2001	eebasist, there are some optical laws: size of panel and focal lenght of an objective are related on themselves. Objective's FL should have minimum the diagonal size of the panel or you won't see the whole image! xblocker

28th June 2002, 09:45 PM	#3
eebasist diyAudio Member Join Date: Apr 2002	Thank you, that means some of those delta series lenses arent big enough since they are ~60mm. So i need a lens with a focal length of at least 250mm (254) for a 10in diagonal lcd?

29th June 2002, 10:32 PM	#4
xblocker diyAudio Member Join Date: Dec 2001	correct, a lot of people with 10" panels use an OHP lens triplet (f~320mm), which is a corrected objective for spherical abberations. xblocker

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