Build Your Own SLA/SLS

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Build Your Own SLA/SLS A forum dedicated to helping you build your own SLA/SLS-based 3d printer 2015-04-29T13:27:45-04:00 https://www.buildyourownsla.com/forum/feed.php?f=12&t=42 2015-04-29T13:27:45-04:00 2015-04-29T13:27:45-04:00 https://www.buildyourownsla.com/forum/viewtopic.php?t=42&p=9729#p9729 <![CDATA[Re: Lens replacement]]> For those interested Texas Instruments has a pdf on the subject of DLP optics that has all the formula for figuring to focal distances and correcting those.

Statistics: Posted by Crusader68 — Wed Apr 29, 2015 1:27 pm

]]> 2015-04-13T15:02:51-04:00 2015-04-13T15:02:51-04:00 https://www.buildyourownsla.com/forum/viewtopic.php?t=42&p=9520#p9520 <![CDATA[Re: Lens replacement]]> http://www.amazon.com/Vivitar-55MM-Clos ... o+lens+kit

Statistics: Posted by dangre — Mon Apr 13, 2015 3:02 pm

]]> 2015-04-11T02:21:14-04:00 2015-04-11T02:21:14-04:00 https://www.buildyourownsla.com/forum/viewtopic.php?t=42&p=9486#p9486 <![CDATA[Re: Lens replacement]]> Statistics: Posted by Crusader68 — Sat Apr 11, 2015 2:21 am

]]> 2014-08-12T01:31:51-04:00 2014-08-12T01:31:51-04:00 https://www.buildyourownsla.com/forum/viewtopic.php?t=42&p=4597#p4597 <![CDATA[Re: Lens replacement]]> First of thank you for your reply, any advice is better then none. I found out that placing a flashlight in front of lenses and tried various combinations may teach about the way projection lens are working. Even simple flashlight from smartphone will do the trick. It's my first time addressing Steve, so I would like to thank him personally for the great job on his great contribution to our community, that partially at least owes its existence to him.
As to Steve's advice, moving the projection lens a few mm further outward from the frame created a blurring corners at offset projection lens. Lenses that had used in nontelecentric architectures projectors, like mp2800 projector.
Best regards guys,
You Are Great Aspiration!
Vlad

Statistics: Posted by golemid — Tue Aug 12, 2014 1:31 am

]]> 2014-08-11T18:31:18-04:00 2014-08-11T18:31:18-04:00 https://www.buildyourownsla.com/forum/viewtopic.php?t=42&p=4594#p4594 <![CDATA[Re: Lens replacement]]> Statistics: Posted by PacManFan — Mon Aug 11, 2014 6:31 pm

]]> 2014-08-11T16:50:42-04:00 2014-08-11T16:50:42-04:00 https://www.buildyourownsla.com/forum/viewtopic.php?t=42&p=4593#p4593 <![CDATA[Re: Lens replacement]]>
I have a few boxes of lenses I have collected over time, and kept trying them all untill I got the result I was
looking for, not very helpfull for you I am afraid, I have seen lens calculator online which may indicate what you need.

sorry not to be of more help.
P.S. from memory one lens was concave and the other convex, about 30mm diameter and approx 40mm apart.

Statistics: Posted by johnrpm — Mon Aug 11, 2014 4:50 pm

]]> 2014-08-11T03:57:39-04:00 2014-08-11T03:57:39-04:00 https://www.buildyourownsla.com/forum/viewtopic.php?t=42&p=4587#p4587 <![CDATA[Re: Lens replacement]]> I disassemble a projection lens totally, tried various combinations, none of them minimize throw.
Please see the attached image, it is a schematic section view of my projection lens.
Hope you have some advice,
Kind regards,
Vlad

Statistics: Posted by golemid — Mon Aug 11, 2014 3:57 am

]]> 2014-08-07T01:24:16-04:00 2014-08-07T01:24:16-04:00 https://www.buildyourownsla.com/forum/viewtopic.php?t=42&p=4553#p4553 <![CDATA[Re: Lens replacement]]> Can you provide some details of how did you manage to reduce the number of elements in the lens?
Kind regards,
Vlad

Statistics: Posted by golemid — Thu Aug 07, 2014 1:24 am

]]> 2013-12-30T17:09:23-04:00 2013-12-30T17:09:23-04:00 https://www.buildyourownsla.com/forum/viewtopic.php?t=42&p=192#p192 <![CDATA[Lens replacement]]>

Statistics: Posted by johnrpm — Mon Dec 30, 2013 5:09 pm

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