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G2 Lens Supplier-ONLY $7 per lens

Alaskan

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Here's a comparison of two of the lenses being sold on ebay now, the upper one is very similar to the lenses I received from Sci-Fi lasers at two dollars something each, maybe closer to three. Anyway, the lens holder in the lower half of this photo are the ones I prefer. Maybe it doesn't make a difference on that end of the lens holder if it has that thick retaining ring, but with the splash mine had I made an association against those lens holders with the big inner ring.

 



GSS

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They are selling the top pic as a G2? Is the link handy?
 

BowtieGuy

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Hey Pete, here's a pic of one of the14mm style holders, with a standard one for reference. :)


 

Alaskan

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They are selling the top pic as a G2? Is the link handy?
405-G-2 Glass Collimating Lens with M9/P0.5 Frame for 405nm 445nm 515nm Laser

Jeff, I sure like the longer lens holder to keep from burning my fingers when trying to focus. It won't truncate with a G2 single element aspheric lens in it due to its short FL of close to 2.4mm, the exit end can be las long as you want it, after collimation, of course. Just mentioning this for those who might not know, I know that is why you wanted them, to put a G2 in and not burn your fingers.
 
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GSS

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Thanks Bow,
that 14mm unit sure opens up some options..When did Dtr discontinue it if you remember?
Alaskan, they seem to be showing 3 different retaining version's or pic's anyways of that G2..Cheap enough I guess but just wondering:thinking:
 

Encap

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I'd like to confirm you business, do you have a web site?
Y0u can't because it does not exist--is only an imaginary daydream of business, business
Sci-Fi lasers started out his relationship with members this very same way, with this very same type of item (IMO, cheap crappy lenses)...
Caution!
Some buyers loose their common sense when they think they are getting a steal, but are the ones who end up getting stolen from.
Exactly.

I smell a snake oil salesman trolling LPF for $s that makes used car sales look like the most honest people on earth -the OP has never assembled or made a laser of any kind and been trolling the forum for 3 months about a daydream host that does not exist with the idea of selling to LPF members --since 28 June 2017 in this thread: http://laserpointerforums.com/f44/thoughts-my-design-100819.html
The OP clearly says he knows nothing about optics in post #21 of the thread saying "I am not as familiar with optics, optical engineering is one of the most complex fields ". He knows nothing about lenses much less quality of lenses in that thread.

In this thread the OP outright misrepresents the lens prices on ebay attempting to sell to the forum:
Anyone can buy a G2 lens with free shipping included 1 at a time for laserlands for $5.98 and much cheaper for more than 1 piece.
See: https://www.ebay.com/i/381139270764?chn=ps&dispItem=1
even less elsewhere see here: 3 pieces for $4.95 w. free shipping https://www.aliexpress.com/item/Laser-Collimating-Lens-12mm-Focus-6-3mm-Diameter-Aspheric-Glass-Lens/32278702524.html?spm=2114.search0104.3.206.O2qcUT&ws_ab_test=searchweb0_0,searchweb201602_1_10152_10065_10151_10130_10068_10344_10342_10343_10340_10341_10307_10060_10155_10154_10056_10055_10054_10059_10534_10533_10532_100031_10099_10338_10339_10103_10102_10052_10053_10142_10107_10050_10051_10324_10325_10084_513_10083_10080_10082_10081_10178_10110_10111_10112_10113_10114_143_10312_10314_10078_10079_10073,searchweb201603_2,ppcSwitch_5&btsid=8d801b98-5bb0-46e1-9ff6-72274d4177ae&algo_expid=82c14ac7-2b35-4825-8609-93ab02232d2e-28&algo_pvid=82c14ac7-2b35-4825-8609-93ab02232d2e
Anyone can but 1 piece of 11mm focal 6mm Aspherical Glass Lens for $6.27 with free shipping here: https://www.ebay.com/p/5pcs-Laser-Collimating-Lens-11mm-Focus-Dia-6-0mm-Aspherical-Glass-Lens/1187977567?iid=201061913596 and 5 pieces for $17.28 that is $3.46 each here: 5pcs Laser Collimating Lens 11mm Focus Dia 6.0mm Aspherical Glass Lens | eBay
 
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Alaskan

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Yea, they are different in those photo's, I didn't look at the other photo's until you pointed it out. I wouldn't buy from a seller who does that with their photo's, you don't know what you will get. Probably doesn't matter with most China sellers, you can't assume the photo is what you will get anyway.

Edit: Encap, you posted as I was writing. I don't trust this at all, maybe he is a dreamer or just trying to make a few bucks reselling ebay stuff. I would be very happy to be wrong and this guy really have a lead on quality g2 lenses at a good price, but I don't expect that will be the reality.

One good thing I found when searching for focal lengths just now, to refresh my memory, the G7 appears to have about a 8 mm focal length which is great, I need to get some of those for my single mode laser diodes. The beam will be fat which is kind of a downer for low power laser pointers due to the reduced power density, or brightness of the beam when fatter, but wow, the divergence ought to be even better. I don't know how well a G7 would work with some multimode diodes, especially the NUBM44, probably will get truncated with that long of a FL, or will it? Anyone know?
 
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GSS

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Read the OP thread....he wants instant reply PM's but has yet to reply??
This is also for G7's if re read plus "all these lenses have much better beam spec's than a 3 element":whistle:
 
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Alaskan

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Well, a G2 and G7 will have less loss than a 3 element lens, but specs? Nope, I prefer a 3 element lens with most of my laser diodes but they don't work well for the NUBM44 due to the long focal length and beam truncating inside the tube.
 

Encap

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Yea, they are different in those photo's, I didn't look at the other photo's until you pointed it out. I wouldn't buy from a seller who does that with their photo's, you don't know what you will get. Probably doesn't matter with most China sellers, you can't assume the photo is what you will get anyway.

Edit: Encap, you posted as I was writing. I don't trust this at all, maybe he is a dreamer or just trying to make a few bucks reselling ebay stuff. I would be very happy to be wrong and this guy really have a lead on quality g2 lenses at a good price, but I don't expect that will be the reality.

One good thing I found when searching for focal lengths just now, to refresh my memory, the G7 appears to have about a 8 mm focal length which is great, I need to get some of those for my single mode laser diodes. The beam will be fat which is kind of a downer for low power laser pointers due to the reduced power density, or brightness of the beam when fatter, but wow, the divergence ought to be even better. I don't know how well a G7 would work with some multimode diodes, especially the NUBM44, probably will get truncated with that long of a FL, or will it? Anyone know?
Look at the OP's thread here: http://laserpointerforums.com/f44/thoughts-my-design-100819-3.html
You can't take anything the guy says at face value --it is all noob daydreams and trolling for $s daydreams which is what has come out clearly in his misrepresentations of ebay prices in the thread. He knows nothing about lasers and even less about lenses for them --I doubt he has owned a laser and is pretty clear he has never made one and knows little if anything about them. All he has done is look at real builders work on LPF and trolled LPF with how his "design" will be the miracle that never has been. He makes "used car salesmen" look like saints. See: http://laserpointerforums.com/f44/thoughts-my-design-100819.html

Here is a thread from 2013 of the G2 vs LFL lens: http://laserpointerforums.com/f49/lfl-long-focal-length-g2-lens-81454.html
 
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Alaskan

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Thanks, found that thread a few minutes ago. The G7 looks good for my needs, I looked on DTR's google shop and on ebay for one, notta. I thought I saw Sanwu had them some time ago, I will check PM him and ask.
 

GSS

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But he's giving us a discount:shhh: and don't forget he's sending lifetime a free build:crackup: We just have to remind him because he's so busy:D
 

Encap

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"25 min purchase"? What does that mean? 25 dollars, or 25 quantity?
It means he has to buy 25 pieces to resell then here as he has nothing, only has smoke and mirrors to sell. Of course for a 25 pieces order anyone can buy them for $2 or $3 each

But he's giving us a discount:shhh: and don't forget he's sending lifetime a free build:crackup: We just have to remind him because he's so busy:D
Yes can't forget the discount or to remind him as he has such a busy pretend business
Too busy to post any pictures of anything he talks about with the date and his nick in the picture.
My guess is because he has nothing he can take a picture of and too busy to post any details of anything. :crackup:
 
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Solomon Laser

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Ok,

I a lot of replies WOW. I have been away from my computer all day so I apologize.

I get these lenses from a manufacture directly, unfortunately I don't have a website... I might when more of my products come out. The 11mm focal point lens is a M9x 05 and is 10mm long, 80% efficiency, I apologize if I said 85 before.

Yes 25 lenses minimum, it does not really make sense for me to address a package for a dollar or so profit... I am really looking for someone or a few people who want to distribute or sell these lenses... as even selling one batch of 25 does not provide much because I have the price so low

I have addressed Encaps concerns in another thread, he really likes picking on me for some reason....

Ok, here is the deal, to eliminate the concern, I ask that a user with power meters PMs me, I will give him the 3 free lenses to test if he posts the results.
 

Alaskan

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Where did you get the 11mm FL from? Can you reference it on the net?

Edit: G2 lenses have 2.39 mm FL, G7 have 8 mm. This shouldn't be called either, if 11 mm. Maybe you meant 11 mm long lens holder?
 
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