Same question as here: http://www.lumenlab.com/forums/index.php? showtopic=19997 If you don't know, I'm pretty sure the focal length of the fresnel (I don't...
Remy, Is the photo result on your website that of a normal curved 15 inch tv or from a flat screen? What are the results like with a normal curved screen tv?...
Hi, My TV's screen is a normal curved screen not flat. Actually it is better to have a curved screen than a flat one because it compensate the negative...
Thanks for your quick reply. So are you saying that the reason standard ebay fresnels give blurred corners mostly because the FL is too short? So I guess you...
Also, I would say its fair to say a 500mm distance from the tv also has less then 1.5 times less light hitting the fresnel compared to a 330mm fresnel. I...
Standard ebay fresnel lens are usually cheap plastic ones (pvc type) It is impossible for you to obtain high quality projected images with these kind of...
Yep that's the price to pay! You will have less light hitting the lens at 550mm than one which is at 330mm but do you want a tv projector that works or one ...
Ok. Im confused why the files in this forum recomend fresnel lenses as last resort for choice if you are claiming better results then with PMN lens? Also many...
Listen, everybody has his own experience. My experience was not good with plano-convex lenses and with triplet lenses. Maybe others had better results, with...
I undertand that all lenses must be diaphramed except a triplet. I ask first starting with a 115mm diameter positive meniscus how much diaphraming is aceptable...
For your first question, secret, secret... Sorry can't answer this one. It took me a lot of testing before I found the right formula. and that's partly what...
Hi, I recently bought a Teac tv second hand to use for my projector and needed to access its service settings to increase the brightness and contrast. I found...
/// New Member \\\ Hello group, name here is: Mark form Clearwater Florida TV info: TV= Magnavox 56 inch (R.S.P. 3X CRT) Model number: FP5420 W101 Chassis...
Hi dear rined, Polished land coated Multi element lenses might not have tolerated this Hard Nursing ! "wiped the inside lense, waited for it all to dry, and...
Hi dear friend, Polished land coated Multi element lenses might not have tolerated this Hard Nursing ! (might have lost original clarity and alignment ) "wiped...
what alinement are we talking about here, i think there is 4 that come to mind? tnx for the reply De K4eeZ Group Owner Of The .C.A.R.G. Clearwater Amateur...
Hey, A local shop has a set of condenser lenses that are mounted together convex to convex. They're pretty big, like 7inches diam, maybe more. Just wondering...
lenses from enlargeres shoud work Syed angryandy11 <angryandy11@...> wrote: Hey, A local shop has a set of condenser lenses that are mounted together ...
Is it possible to buy a fresnel lens locally, and does the fresnel lens have to be the same size as the screen on the tv that is being used? Thanks. Scott...
Bought several years, it seems to be a lens used for the first retroprojector during seventees. Diameter : 6,5 inchs. The adress if somebody is interrested : ...
Hi, I've been using my diy crt projector for about 6 months now. I'm using a 42cm fresnel lens,first image mirror and have a silver pvc screen painted white. I...
Hello, Just to tell that I sell my big lens (diameter more than 16cm (6,4 inchs)) with bid on a-bay (title : enorme lentille). If someone is interested... Best...
hi still have my mag box complete one thing i wish i knew how to do is turn up the contrest, the dark seens are way too dark but duing out door daylight seens...
I sell giant lenses in INDIA only 10" dia(250 mm dia) with focal length 580 mm 0r 370 mm for CRT projection. These lenses are fresnel type and can be also used...
Hi, To fine tune your tv for crt projection it's a must to be able to access your tv's service settings. Do you have access to them on your tv? If you leave...
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