DLP Projector lenses - is hacking throw ratio possible?
Posted: 29 Jan 2021, 18:19
I would like to start a discussion regarding projectors.
Cameras and lenses are quite easy to find, they work out of the box.
They have a variety of features, pros and cons.
Consumer DLP/LCD/Laser/LED/Halogen... projector are used most of the times without modifications.
Lenses are often the weak ring in the chain, and probably the hardest to mod.
(yes: color wheel, kind of light source, etc.. all have their impact).
But the biggest issue I have found is the fixed throw ratio, too long minimum focus distance, poor focus and lens quality, etc...
I got the idea to start this thread following a discussion that started in a Micr0 thread:
https://www.3dscanforum.org/viewtopic.p ... 3&start=10
My wish: to add a tele zoom to my LGPF50KS or a PF1500 I can use to create a multi-FVO (with 3 lenses: 12-16-25 mm) scanner.
Something like the RangeVisionPro (which I suppose is using a zoom projector lens) or HDI Advance (which I don't).
As an alternative, I will consider using three lenses for the projector.
This will help (if I am not in mistake) keeping a similar camera distance and reducing the scanner dimensions.
Polyga is selling a development scanner that uses a TI DLP projector:
https://www.polyga.com/evm-3d-scanner-kit/
People watching films often looks for the opposite: reducing throw ratio:
https://www.avsforum.com/threads/wide-a ... or.378751/
https://www.instructables.com/Turn-a-Re ... hrow-Mode/
(notice the distorsion when usins additional lenses)
So if anybody has good thought based on optical theory and experience, the community of DIY will thank you!
Cameras and lenses are quite easy to find, they work out of the box.
They have a variety of features, pros and cons.
Consumer DLP/LCD/Laser/LED/Halogen... projector are used most of the times without modifications.
Lenses are often the weak ring in the chain, and probably the hardest to mod.
(yes: color wheel, kind of light source, etc.. all have their impact).
But the biggest issue I have found is the fixed throw ratio, too long minimum focus distance, poor focus and lens quality, etc...
I got the idea to start this thread following a discussion that started in a Micr0 thread:
https://www.3dscanforum.org/viewtopic.p ... 3&start=10
My wish: to add a tele zoom to my LGPF50KS or a PF1500 I can use to create a multi-FVO (with 3 lenses: 12-16-25 mm) scanner.
Something like the RangeVisionPro (which I suppose is using a zoom projector lens) or HDI Advance (which I don't).
As an alternative, I will consider using three lenses for the projector.
This will help (if I am not in mistake) keeping a similar camera distance and reducing the scanner dimensions.
Polyga is selling a development scanner that uses a TI DLP projector:
https://www.polyga.com/evm-3d-scanner-kit/
People watching films often looks for the opposite: reducing throw ratio:
https://www.avsforum.com/threads/wide-a ... or.378751/
https://www.instructables.com/Turn-a-Re ... hrow-Mode/
(notice the distorsion when usins additional lenses)
So if anybody has good thought based on optical theory and experience, the community of DIY will thank you!