Does anyone happen to know the diameter of the standard LL triplet lens?
I need the measurements to optimize my LCD to Projector Lens distance within the projector box.
Thanks.
Full Version: Diameter of Standard Projection Lens
80mm?
The lens is 80mm in diameter and the casing adds a few more mils.
On the one I got
The shaft/barrel diam (measured externally) is 70mm,
eg the hole for your box should be 70mm.
the length of the barrel from the back of the flange/lip is 30mm, the lens sits about 4mm below this,
eg distance from front of box/mounting to back of actual lens is ~26mm
(verb0ten, i think this is what you were asking for no?)
Flange/lip whith the screw holes protrudes about 9mm all around from the barrel. (eg flange rim diam is 88mm)
The inner exposed lens diam is approx 60mm.
Where are you guys getting the 80mm from???
Did I get a different lens?
The shaft/barrel diam (measured externally) is 70mm,
eg the hole for your box should be 70mm.
the length of the barrel from the back of the flange/lip is 30mm, the lens sits about 4mm below this,
eg distance from front of box/mounting to back of actual lens is ~26mm
(verb0ten, i think this is what you were asking for no?)
Flange/lip whith the screw holes protrudes about 9mm all around from the barrel. (eg flange rim diam is 88mm)
The inner exposed lens diam is approx 60mm.
Where are you guys getting the 80mm from???
Did I get a different lens?
Mine is 70.9 mm outside diameter with a 60mm lens arpature.
This is the stock lens that I recieved.
Kirk
This is the stock lens that I recieved.
Kirk
Cool, thanks to all for the comments. It's much appreciated.
I was asking for the lens diameter (which I just learned is the same as the lens aperture) because my thought is that differing sizes of LCD screens will have different condensed image dimentions as the projected image hits the projector lens. If the condensed image is larger than the lens aperture, you will be missing some of the image in the end as it is not passed through the lens. Conversely, if the image is much smaller, your lens is not being efficiently used, translating to a larger than needed enclosure.
With the aperture as a known value, you could theortically calculate the minimum front fresnel to projector lens distance for any size lcd.
This way, you would ensure that your enclosure is as nice and tight as possible under any circumstances.
Let me know if my thought process is waaay off here, I'm still trying to pick up most of this...
Hey Brainchild,
Could you add full specs to the triplet lens listed in the LL store to avoid future confusion. I think it would be a help to your faithful customers.
I was asking for the lens diameter (which I just learned is the same as the lens aperture) because my thought is that differing sizes of LCD screens will have different condensed image dimentions as the projected image hits the projector lens. If the condensed image is larger than the lens aperture, you will be missing some of the image in the end as it is not passed through the lens. Conversely, if the image is much smaller, your lens is not being efficiently used, translating to a larger than needed enclosure.
With the aperture as a known value, you could theortically calculate the minimum front fresnel to projector lens distance for any size lcd.
This way, you would ensure that your enclosure is as nice and tight as possible under any circumstances.
Let me know if my thought process is waaay off here, I'm still trying to pick up most of this...
Hey Brainchild,
Could you add full specs to the triplet lens listed in the LL store to avoid future confusion. I think it would be a help to your faithful customers.
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