Very Large Fresnel Lens CHEAP

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#61
Anyone Up for a Fresnel?

So that is what I have to look forward to - very cool! I hope that people start pre-ordering. I still need 18 pre-orders in the next few days, or the dual FL lens may be a no-go. If anyone needs help deciding or has interest but needs mor info, please email me soon. You can already pre-order this lens from my website at www.diylabs.org/projector/parts.htm by clicking on the "fresnel lenses" link. Thank you for your participation
 
#62
Alan, your new fresnels will help out a lot of people on these forums and should be very popular regardless of anything we touched on in this thread. No one should hold back from buying a lens due to anything me, ace or anyone else said about them. Like Ace mentioned, we're just touching on subjects that arent usually talked about. Most people on the forums still think a fresnel is a fresnel regardless. So it's good to know these things.

I'm not trying to be a jerkoff or putting you down for my own advantages (I do have a site, but dont and won't sell fresnel lenses) so it really doesnt effect me in the least.

I would have gone a different way is all. Different focals, different pitch counts etc.

But like I said, great lenses, great price... can't go wrong.

And the 92% versus 95% argument is really pointless!. AWI, Edmund... most of their lenses are 92% and sell for hundreds of dollars a lens. Like Cruser said... NO ONE will actually SEE the difference between the two... and if you THINK you can... your kidding yourself 🙂 You MIGHT be able to get a reading from a light meter... but you'll NEVER see a brighter image from 3% more light throughput! Sorry Ace!

Think of the extra 3% like a benchmark test on computers with very close specs. Sometimes even though one is faster on paper... you need to run benchmark tests to actually SEE the difference between them.

JCB
www.diybuildergroup.com
 
#63
JCB, thank you also for your input. I see what you are saying. I would like to mention that I looked into a higher ring count, but found that to be a bit more costly and it would delay the fresnel manufacturing process. Are there others that would be more interested if there were a higher ring pitch, such as 0.3mm vs. 0.5mm? That is still a possibility if enough people want it, but I still need more people to join the group buy before I can guarantee anything.
 
#65
Like Cruser said... NO ONE will actually SEE the difference between the two... and if you THINK you can... your kidding yourself You MIGHT be able to get a reading from a light meter... but you'll NEVER see a brighter image from 3% more light throughput! Sorry Ace!
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LOL come over to my house and ill show you the difference, trust me, you will never go back to 92% again!

Trev
 
#67
I have to say, your a great guy... but when it comes to this **** your getting worse by the day. Contrary to popular belief... you dont know it all! And still have a lot to learn... as do I. But at least I dont pretend to know it all.
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JCB, if only you was here you would know too, as you could see it for yourself. Thats first hand experience.

About me knowing it all, ofcourse not, thats just a pathetic veiw in my mind, its impossible for anyone to know it all in anything, it doesnt matter how smart you are nor what degree you hold. But i will say this, thiose who have first hand experience over anything, will have a gain on those who only have a theory on things.
 
#68
Ace: No offense but unless you are going to publish scientific data about your results with a total equipment list in each case where you have used the 2 differnent fresnel types (which I assume were exactly the same apart from their transmissability and in exactly the same test rig?) so that we can be sure that you are comparing like with like. Then publish scientific readings about the output i.e. brightness, colour saturation etc. then I think its just your opinion. Even if it turns out to be true there's no need to state the same thing over and over.
 
#69
Ace: No offense but unless you are going to publish scientific data about your results with a total equipment list in each case where you have used the 2 differnent fresnel types (which I assume were exactly the same apart from their transmissability and in exactly the same test rig?) so that we can be sure that you are comparing like with like. Then publish scientific readings about the output i.e. brightness, colour saturation etc. then I think its just your opinion. Even if it turns out to be true there's no need to state the same thing over and over.
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Heya dave, no ofence but they have been tested in the exact same test rig and clearly you can see the difference with your eyes, they also have been tested with 3 sets of eyes and not just 1. Sure you could have scientific data on the test, but when you think about it, at the end of the day you will be looking at the projected image and not the data. If you can clearly see the difference with your eyes, thats what counts, and in this case myself and others who are here can clearly see that difference.

Either way as i said before, i gave data in here, i gave results for all to learn, if nobody wants to learn first hand experiences, then ill shut up, its that simple.

Guys, this is Allans group buy, lets just quit this, i beleive we all have said enough on this matter and should discuss it in a new thread. Lets just get on with the group buy for some respect to Allan holding the great deal.
 
#70
Getting Back to the Fresnel Group Buy

For anyone just tuning in, this thread is about a group buy for large fresnel lenses that will work with any LCD panel sizes up to 17" in 4:3 or 16:9 widescreen ratio! We're offering two different configurations of fresnel lenses:

15.5"x15.5" Dual Focal Length Fresnel (#DFLF15SPLIT)
Front Focal Length: 330mm (~13 in.)
Rear Focal Length: 220mm (~8.67 in.)
Largest Effective Square Aperature: 15"x15" (no corners missing)
Ring Pitch: 0.5mm (2 grooves per mm)
Thickness: 2.0mm (1.0mm per side)
Price: $52.65 (group buy special)


15.5"x15.5" Fresnel (#FL15SPLIT)
Front Focal Length: 330mm (~13 in.)
Rear Focal Length: 330mm (~13 in.)
Largest Effective Square Aperature: 15"x15" (no corners missing)
Ring Pitch: 0.5mm (2 grooves per mm)
Thickness: 2.0mm (1.0mm per side)
Price: $29.99 (group buy special)


These lenses are available for pre-order by emailing me or going to www.diylabs.org/projector/parts.htm and clicking on "fresnel lenses". When you purchase a lens, you are actually receiving a split fresnel - two fresnel lens halves. This is the best configuration to purchase them in since it allows for either fresnel method (split vs. combined).

We have several people who have expressed a lot of interest in this lens and who are planning to purchase, but we really need your support now if at all possible. Thank you very much!
 
#72
Im already in for one of the #DFLD15SPLIT . It will go nicely with all the 12.75" glass and lexan frames im using to sandwich my current 12.2" fresnel.

Nice to see this thread back on track, I guess the DIY special forces seal team took the hijackers out!
 
#75
He speaks the truth - the 30th is the end of the goup buy. The lenses will still be available after that of course, but the price will be a bit higher (about $60, which is still pretty good compared to what is used to cost!). If your not able to get a pre-order in by the 30th, and need just an extra day or two, then email me and that should probably be fine. I'll work with you however you need - I want to get these lenses out there to as many people as possible!
 
#77
If anyone would like to place a custom order, I would be fine with selling fresnel lenses by the half so that you could customize your set of either both short FL, both long FL, or one of each. You could also purchase an odd number of fresnel lens halves if you would like to for some reason. Just email me or post your question here if anyone would like to do that.
 
#79
Group Buy Update

For anyone interested in these larger fresnel lenses, I still need 5 more pre-orders, so please order soon if you are interested. Also, I'll be putting a thread on my home theater forum at www.diylabs.org/projector/ that I will post updates to as they are available. If you can't join the group buy for now, please at least let me know if you are interested so that I'll have an idea of how many lenses to order. Thank you!
 
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