Chris S. wrote:...I’d be interested in seeing more details of your reflector/collimator approach...
Quick drawing of the existing onePau wrote:Me too!
...and link to the 3D view of the adapter:
https://www.3dvieweronline.com/members/ ... NHMGnH48iW
Moderators: rjlittlefield, ChrisR, Chris S., Pau
Chris S. wrote:...I’d be interested in seeing more details of your reflector/collimator approach...
Quick drawing of the existing onePau wrote:Me too!
Chris, thanks for the information !Chris S. wrote: In my experience, EKE bulbs cast plenty of light for 100x, even with cross-polarization, which wastes most of the light. Without X-pol, I have to dial back the intensity using my illuminators’ irises, in order to permit the 8-second exposures I prefer. Also, this is often with a quad head, which of course divides the light four ways. If you’re willing to use exposures in the realm of two seconds, I think you’ll be fine. This said, my experience may only apply if you can concentrate and collimate the light into the FO light guide with a parabolic reflector, or perhaps another approach.
BTW, I’m not at all sure that the light need be concentrated within the physical diameter of the FO light guide. I had a conversation about this with a leading researcher in fiber optics. He described optical fibers as having a numerical aperture/entrance cone. His sense was that my collimated light source need only fall within the optical fiber’s entrance cone—which would be larger than the diameter of the FO light guide—to be transmitted down the light guide.
Hard to tell. I have to find the right way to measure it. I have Minolta flashmeter, maybe it will work ?Pau wrote:Now what for me are the key questions:
- Is the light more collimated and/or more intense that if you just place the FO at the same distance of the LED without the Lens + snoot adapter?
I do not think so. And, what is most interesting, I tried this approach with 5w LED also, both 5w and 30w looked very similar. I suspect, because of the FO angle of acceptance, same count of subLED's fits to this cone angle.- Is the light more intense that if you just place the FO just as close as possible to the LED?
http://www.ebay.com/itm/2pc44mm-Lens-Re ... xyzi9Si6s1I affirmative to both questions, what kind of lens do you use?
Pau,Saul wrote:I do not think so. And, what is most interesting, I tried this approach with 5w LED also, both 5w and 30w looked very similar. I suspect, because of the FO angle of acceptance, same count of subLED's fits to this cone angle.Pau wrote:- Is the light more intense that if you just place the FO just as close as possible to the LED?
Hi JCB,jcb wrote:Could you list the equipment you use from the mains plug to the Cree LED ? What is the Cree LED color temperature ?
In my short experience the only approach that will work with a big light source like your COB LED is by means of lenses, but you would need to design the adequate optics. Did you see my links at my first post?I tried several options to get the light into the entrance pupil of the FO conductor. I tried directly shoning the LED into the FO guide. I tried to diffuse the light with a spherical diffuser, and I tried diffusing the light and keeping it inside the diffuser. NONE of the options gave me a strong enough light at the other end of the FO guide.
Nice project. I admire your DIY skills but...you can buy complete and working used FO illuminators for very good pricesI wonder if I use a less powerful EKE lamp, say a 100W 12V bulb, what results would I get.
That's my next project
Hi vitikin,Pau wrote: Did you see my links at my first post?