Old 07-01-2016, 02:14 AM #1
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Default Lenses from a projector TV

I scored three lenses from an old TV and the fresnel screen lens. The lenses are biconvex and flatter on one side. Much like a human eye lens. Anyone interested?

The screen lens cracked, so it still has 24"by 36" of usable area


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Old 07-01-2016, 02:30 PM #2
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Default Re: Lenses from a projector TV

How many inches diameter biconvex lenses, are the plastic or glass? I can find 4 inch plastic out of an old TV projector, but so far, never glass.
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Old 07-01-2016, 02:54 PM #3
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Default Re: Lenses from a projector TV

Four inches and they are real glass
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Old 07-01-2016, 04:26 PM #4
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Default Re: Lenses from a projector TV

How much do you want for all the lenses? I've always wanted to play around with a fresnel lens

Edit: I'm interested, of course only if Alaskan passes up on them
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Old 07-01-2016, 05:08 PM #5
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Default Re: Lenses from a projector TV

When I get a chance, I'll post photos this weekend.
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Old 07-01-2016, 05:14 PM #6
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Default Re: Lenses from a projector TV

Go for them Cali! Are they coated? If yes, I'm interested, if not, Cali is welcome to make a deal you can't refuse

If anyone knows where to find some large diameter, 3 inch or larger, VIS coated PCX lenses for a good price (surplus) please contact me.
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Old 07-01-2016, 09:57 PM #7
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Default Re: Lenses from a projector TV

I have 2 of these glass lenses as well. (Didn't save the Fresnel) If trussmonkey25 gets rid of all his and someone wants more I need to fund the XPL RG:Y diodes if we do that single mode group buy. I'd match any offer. I'm by no means greedy and this would require trussmonkey25's approval only after he acknowledged he has gotten rid of all his. I will also add these came out of a hitachi rear projection TV for anyone hunting.
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Old 07-02-2016, 12:31 AM #8
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Default Re: Lenses from a projector TV

Quote:
Originally Posted by Alaskan View Post
Go for them Cali! Are they coated? If yes, I'm interested, if not, Cali is welcome to make a deal you can't refuse
Thanks buddy! I have 12 BDR-209s that I have been planning to do put together for some time. I've got the diodes/sleds but no spare time right now. I've been wanting to grab a mix of lenses to try to learn hands on and have some fun at the same time.
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Old 07-02-2016, 09:09 PM #9
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Default Re: Lenses from a projector TV

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Old 07-02-2016, 11:31 PM #10
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Default Re: Lenses from a projector TV

How much do you want for them?
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M140 @1.8a- c8 with G7- 2.32w
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NDB7875 @2.4a- c8 with G2- 3.11w
Nubm44@4.5a- S4X with G7- 6.12w

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NUBM07E@4.5a- 'Gadget' custom C8 with 3E- 4.15w

PLP-520B1- 'ElectricPlasma' custom with 2E lens-202mw
PL520- laser66 with g7- 137mw
XPL 1W 532nm- 1.41w avg 1.97w peak
Laserbtb 532-HL300- 380mw avg 509mw pk
# of Multiline 532s= (17)
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Old 07-03-2016, 12:45 AM #11
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Default Re: Lenses from a projector TV

Thirty bucks each.
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Old 07-03-2016, 07:08 AM #12
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Default Re: Lenses from a projector TV

Those look nice and with a very slight curve on one side ought to work for just about anything we need, if using it for a BE put the more pronounced curved side towards the diode. Although sometimes I use them the other way around. I'd pay 20 dollars for one of those lenses, but 30 is too much for my interest, if you want 30 for them and Cali doesn't snap them up, I'd try listing on ebay as 4 inch Diameter Glass Biconvex Lenses. I will give him first shot at them, since they aren't coated.
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Attention new brothers of the collimated light!

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

YAG Power Calc. Laser Peak Power Calculator - Ophir

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

RHD's Calc: http://lsrtools.1apps.com/RelativeBr...&useRaleigh=on

High Current Pulse Drivers: https://tinyurl.com/ya7whuk3

Last edited by Alaskan; 07-03-2016 at 07:52 PM.
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Old 07-06-2016, 03:47 PM #13
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Default Re: Lenses from a projector TV

Truss?
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