Just picked up a friend from airport today. He brought me 2 fresnel lenses from You-Know-Who in Guangzhou 😀.
one is 395mmx395mm f330mm lens. and another is a 400mm x 320mm f550mm lens. Are you thinking 3Dlens? They were made in northern China, where is far away from 3Dlens.
Both lenses were cracked during transportation
But they are still good enough to experiment with ( will do after I finish my diseartation ). I don't know how much they cost because they were aquired as 'samples' for a flat fee. but as far as I know the most expensive model in this manufacturers production line is under $20 a piece (550mm wasn't in the list though).
one is 395mmx395mm f330mm lens. and another is a 400mm x 320mm f550mm lens. Are you thinking 3Dlens? They were made in northern China, where is far away from 3Dlens.
Both lenses were cracked during transportation
But they are still good enough to experiment with ( will do after I finish my diseartation ). I don't know how much they cost because they were aquired as 'samples' for a flat fee. but as far as I know the most expensive model in this manufacturers production line is under $20 a piece (550mm wasn't in the list though).Attachments
Do their have any thing that is bigger? Something in the range of 370*550mm, FL between 450 and 550mm.
DJ
DJ
the problem is you never know when and what is in stock. I wanted a 450mm and a 505mm fresnel lens at the beginning, but I had to change twice because they were not in stock and the replacement they confirmed in stock were not in stock either. I think I already forgot what I requested at the end now. but getting a 550mm is a nice surprise.
why do you need a 550mm wide lens? I thought 400mm wide is large enough for most LCDs?
why do you need a 550mm wide lens? I thought 400mm wide is large enough for most LCDs?
Yeah, thought that 😉
Have just purchased the 220 mm and 630 mm fl lenses ($9.50 ea) as I've managed to pick up a cooke process triplet lens (f/10, 25 inch for 16x20 format) on ebay which has a 25" fl (635 mm) and which should cover up to at least a 22" LCD.
http://cgi.ebay.ie/Cooke-process-lens-Series-VA_W0QQitemZ7538864757QQcategoryZ30076QQcmdZViewItem
Hopefully, these should match quite nicely, We'll see...
Have just purchased the 220 mm and 630 mm fl lenses ($9.50 ea) as I've managed to pick up a cooke process triplet lens (f/10, 25 inch for 16x20 format) on ebay which has a 25" fl (635 mm) and which should cover up to at least a 22" LCD.
http://cgi.ebay.ie/Cooke-process-lens-Series-VA_W0QQitemZ7538864757QQcategoryZ30076QQcmdZViewItem
Hopefully, these should match quite nicely, We'll see...
makey2 said:
Sounds like a good deal. Where did you buy the fresnels? What size and groove pitch are they?
Hey rlwoodjr,
This is where the lenses are from:
http://www.evergreen-henan.com/Fresnel Lens.htm
They have a Groove Pitch of 0.5mm, and their dimensions are:
431mm × 406mm × 2mm
Fl of 630 and 220 mm
This is where the lenses are from:
http://www.evergreen-henan.com/Fresnel Lens.htm
They have a Groove Pitch of 0.5mm, and their dimensions are:
431mm × 406mm × 2mm
Fl of 630 and 220 mm
I contacted:
lidong@evergreen-henan.com
I requested the price per sample and shipping (Fedex) and organised payment through western union money transfer. The triplet and varifocal triplet I ordered came about 5 days later. The fresnels I ordered on the 31st aug are in london now (fedex track 😉). Should have them monday.
lidong@evergreen-henan.com
I requested the price per sample and shipping (Fedex) and organised payment through western union money transfer. The triplet and varifocal triplet I ordered came about 5 days later. The fresnels I ordered on the 31st aug are in london now (fedex track 😉). Should have them monday.
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