Old 09-25-2015, 06:14 PM #33
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Default Re: WTB - "Extended Length" Lens Holder

Yes, Gary does have some nice extended focus adapters, I have used quite a few on my own builds. I'm glad he added the green ones to his inventory a while back.


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Old 07-07-2016, 04:11 AM #34
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Default Re: WTB - "Extended Length" Lens Holder

This is responding to a very old thread, but I found these today: Michael Mei's Store - Small Orders Online Store, Hot Selling cut saw,filter circuit,filter sticker and more on Aliexpress.com | Alibaba Group - I don't know if this link will expire or not, but it's on AliExpress.com and is Michael Mei's Store. The long barreled lens is on the bottom right hand courner of the page. I believe their is an error on the focal length, 15mm isn't right.
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Newbie advice: Please take the time to first make an introduction in the Welcome section before posting questions.


Divergence to spot size calc: - 1 mRad is about .057 degrees which expands to be very roughly ~10% the diameter of the moon or sun at their distances.

Divergence Calculator: pseudonomen137's JScript mRad Calculator - Measure your lasers beam dia. at 1 foot & then 20'.

Online calc. to determine spot intensity at different mRad's & powers: http://tinyurl.com/divergence-calculator

Laser Power Density Calculator: Laser Power Density Calculator - Ophir

Build a beam expander to reduce divergence: http://tinyurl.com/BeamExpander

University YAG Project The Professor's Homebuilt Lasers Site - YAG Lasers

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Angular Size Calculator; use with diode angle of radiation spec. for lens dia. at FL: Angular Size Calculator

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Old 07-07-2016, 04:39 AM #35
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Default Re: WTB - "Extended Length" Lens Holder

Great find!
Those do look to be 15mm long, that's at least as long as the old style extended length lenses.
Thanks!
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405nm Custom JETLASERS Ti-B (1.08W)

445nm Build "Ole Blue" (2.8W+)
445nm 1.3W JETLASERS PL-E (1.5W)

450nm Custom JETLASERS Ti-B (327mW)
462nm Solarforce T2 (2.1W)-link-
465nm 1.4mW JETLASERS Mini (1.64W)
467nm "Maraxus" (2.3W)
470nm "Silver Bullet"
515nm 30mW Ehgemus titanium (84mW)
520nm S/S build (250mW) •50mW JETLASERS Ti-B (73mW)
520nm Ehgemus Custom (1.45W) •Coleman Jr. (234mW)
-link-
532nm 1.5W Goldenstar lab (3W)
532nm 500mW JETLASERS PL-E (754mW)
532nm 100mW JETLASERS Ti-B (161mW)
532nm 5mW "Eclipse" mints tin (54mW)

589nm 80mW CNI PGL-III-C (154mW)
589nm 50mW Dragonlasers Spartan (124mW)

594nm L/G Rigel-6 "LPF Anniv. Ed." (6.7mW)
635nm 20mW JETLASERS Ti (30mW)
638nm Custom JETLASERS Ti-B (232mW)-link-
638nm "Coleman Special" (260mW)
638nm Build in sinner's "MS-SSW Stubby" (1.25W)
650nm W/L E2 (89mW) • Laserbtb PL-650 1000 (1W)
660nm S/S Build (383mW)
674nm 501B/Melles Griot u/k Build 20mW

LK-3D Projector

5W Ophir/dmm LPM, nospin 5W LPM
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