Hey! Thanks for looking at my setup. If you have any worries or qualms or things that might need improvement, please let me know. 🙂 Here's my setup as of yet (un-ordered except for the LCD), so any of the lenses are up for improvement. 🙂 You don't need to give me solutions to problems, even just pointing out problems would be great. 🙂
I'm mainly concerned if the optics would work correctly, or if there's a better way to do it. The large 7 1/2" lens costs $22, the negative lens costs $15, as does the Fujinon projection lens. All are available from Surplus Shed. It would be about $50 in optics, but if it all works I think it will definately be worth it. I heard that normal optics are better than fresnel lenses as for losing light, but that's completely heresay at this point. Thoughts on my setup before I add them all to my shopping cart and get them shipped to my house? 🙂 *ANY* feedback will be greatly appreciated. 🙂
Thanks!
--Clint
P.S. The main problem that I'm trying to overcome is how to project a 5.7" LCD through a 4" projection lens. If you can think of a better way to do it (even building my own projection lens), please lemme' know. 🙂
I'm mainly concerned if the optics would work correctly, or if there's a better way to do it. The large 7 1/2" lens costs $22, the negative lens costs $15, as does the Fujinon projection lens. All are available from Surplus Shed. It would be about $50 in optics, but if it all works I think it will definately be worth it. I heard that normal optics are better than fresnel lenses as for losing light, but that's completely heresay at this point. Thoughts on my setup before I add them all to my shopping cart and get them shipped to my house? 🙂 *ANY* feedback will be greatly appreciated. 🙂
Thanks!
--Clint
P.S. The main problem that I'm trying to overcome is how to project a 5.7" LCD through a 4" projection lens. If you can think of a better way to do it (even building my own projection lens), please lemme' know. 🙂
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That's about what I have in mind as well after a bit of thinking. Myself also, I have to deal with the problem of shrinking the image size of a 5.6" LCD to fit through a 4" lens, but I was going to go with the Delta 20 instead. Be a while before I can get the lenses as I'm in the middle of job hunting, so I won't be the first to try, but if you get to it first and figure out a way, let me know how it works.. 🙂
I'm not a big fan of the idea on using a fresnel in front of an LCD.. I dunno, maybe I just can't get it past my head that something with that many ridges will be able to display the image correctly, without having artifacts visible from those ridges.. For the cost of them though, it may end up being something I'd try, if even just to rule them out.. *shrugs*
From the looks of your drawing though, and knowing what little I do about optics and moreover, angle refraction, it seems to be right to me, provided that the lenses are matched in their angles of refraction..
Wish I could get my hands on a Delta HD-145... It's an HDTV lens thats 5" meant for flat CRT... Or better yet (And no doubt more $$) the HD-10K which is a whopping 7" in size.. Just for fun I've been tracking down someone at 3M to speak to on the costs of these lenses, just to see.. No doubt they're several hundred $$ if not more..
http://www.corningprecisionlens.com/theatercatalog.cfm - Formerly FORMERLY known as U.S. Precision Lens -- Formerly known as Corning Precision Lens -- Now known as 3M Precision Optics, but still paged under Corning..
I'm not a big fan of the idea on using a fresnel in front of an LCD.. I dunno, maybe I just can't get it past my head that something with that many ridges will be able to display the image correctly, without having artifacts visible from those ridges.. For the cost of them though, it may end up being something I'd try, if even just to rule them out.. *shrugs*
From the looks of your drawing though, and knowing what little I do about optics and moreover, angle refraction, it seems to be right to me, provided that the lenses are matched in their angles of refraction..
Wish I could get my hands on a Delta HD-145... It's an HDTV lens thats 5" meant for flat CRT... Or better yet (And no doubt more $$) the HD-10K which is a whopping 7" in size.. Just for fun I've been tracking down someone at 3M to speak to on the costs of these lenses, just to see.. No doubt they're several hundred $$ if not more..
http://www.corningprecisionlens.com/theatercatalog.cfm - Formerly FORMERLY known as U.S. Precision Lens -- Formerly known as Corning Precision Lens -- Now known as 3M Precision Optics, but still paged under Corning..
Thanks Dark!
Thanks for your reply! 🙂
Cool. 🙂 I'm glad to hear that it makes sense in someone else's mind and not just my own twisted lump of gray matter. 🙂
Yeah, I'm still debating on what to do about the fresnels. 🙂 It would save me almost $40. 🙂
Do you still need a projection lens if you use fresnels? I'm really unclear as to what a projection lens actually *does*.
--Clint
Thanks for your reply! 🙂
Cool. 🙂 I'm glad to hear that it makes sense in someone else's mind and not just my own twisted lump of gray matter. 🙂
Yeah, I'm still debating on what to do about the fresnels. 🙂 It would save me almost $40. 🙂
Do you still need a projection lens if you use fresnels? I'm really unclear as to what a projection lens actually *does*.
--Clint
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