Hey all, I am in need of a condensor lens, and I am not having any luck finding any. Anyone know where I could purchase one? Thanks
If you don;t mind shipping time and cost, you can get one from YWH in guangzhou, China. I got a reflector from him cheap.
thanks, ol' YWH eh? I am need of an extra reflector too... how much total did it cost for him to ship it over to you, if you don't mind me asking.......
Ok, please educate me guys! make me smrt lol!
I admit i dont even know how a condenser lens actually works or what it is.... I just know i need one from what I've been told. I assume it focuses the light to a point, making it more of a point source for the fresnel.
Surplus shed doesnt have any specifically labeled "condensor lens", or can a condenser lens be any type of focusing lens?
And if so, what should the focal length of a condensor lens be? Or does it only depend on how i want to design the projector?? It confuses me like, the focal of the bottom fresnel is 14", so do i need a condenser that will focus the light at 14"???
Thanks for the help!!
I admit i dont even know how a condenser lens actually works or what it is.... I just know i need one from what I've been told. I assume it focuses the light to a point, making it more of a point source for the fresnel.
Surplus shed doesnt have any specifically labeled "condensor lens", or can a condenser lens be any type of focusing lens?
And if so, what should the focal length of a condensor lens be? Or does it only depend on how i want to design the projector?? It confuses me like, the focal of the bottom fresnel is 14", so do i need a condenser that will focus the light at 14"???
Thanks for the help!!
ok, i just got a BIG grab bag of various lenses from a warehouse cheap, i am working on finding the focal lengths for them, think any i can use for a condenser??? HELP! 🙂
does this warehouse have anymore lenses?
if you have a 3plet amongst those lenses can u sell me one?
if you have a 3plet amongst those lenses can u sell me one?
condensor lenses
you can make condensor lenses from acrylic -- since you are using 2 lenses of symmetrical characteristics you don't need particularly fine optics in this application.
you can make condensor lenses from acrylic -- since you are using 2 lenses of symmetrical characteristics you don't need particularly fine optics in this application.
NG: Nope, sorry no triplet in these, all singles. thatd be nice but i prob would keep it anyway hahah!! Oh btw, I got the lenses from a glassworking shop locally, They sell a bunch in bulk usually once in a while, some with flaws, some are fine. I'll keep an eye out for more.
jackinnj:
So I can just make a condesor lens? How do I go about doing that?? Just get a lens over my light source and focus it onto the center of the fresnel?? I am confused still... computers and electronics are my thing, this optics was high-school stuff haha!
I just figure from the little I know:
Get a lens, put it over MH light / reflector, setup fresnel @ the lens's focal length, and done?? or missing something in my train wreck of thought??
jackinnj:
So I can just make a condesor lens? How do I go about doing that?? Just get a lens over my light source and focus it onto the center of the fresnel?? I am confused still... computers and electronics are my thing, this optics was high-school stuff haha!
I just figure from the little I know:
Get a lens, put it over MH light / reflector, setup fresnel @ the lens's focal length, and done?? or missing something in my train wreck of thought??
50joe said:
sadly, Optics (or at least ray tracing) isn't in the High School Physics syllabus anymore -- at most high schools at least. What a shame as we get into nano-technology.
a kondensor lense just gathers the light and throws it in a more narrow cone than it would normaly go. it is important for some fresnels with high focal length. i split my fresnel in two fresnels of different focal length. so i need a condensor now, or otherwise the light won't be focussed by the fresnel at all. but it has to go through the projection lense...
i woulnd't recommend making your own condensor, since those lenses are high heat resistant. acrylic is just plastic! it will melt!
i woulnd't recommend making your own condensor, since those lenses are high heat resistant. acrylic is just plastic! it will melt!
I have glass lenses I will try with too...
So do i get this yet?? A lens to focus the light source into a point (the condenser) that hits the center of the fresnel, can effectively decrease the amount of space needed for projection right? Say the normal Focal of a fresnel is 14". I have a lens that I place in between the light and the fresnel that lets me focus the source to a point at about 8", so I place the fresnel there, where the light is focused, eliminating the 14" space previously needed without a condenser??????? Thanks for the help guys
So do i get this yet?? A lens to focus the light source into a point (the condenser) that hits the center of the fresnel, can effectively decrease the amount of space needed for projection right? Say the normal Focal of a fresnel is 14". I have a lens that I place in between the light and the fresnel that lets me focus the source to a point at about 8", so I place the fresnel there, where the light is focused, eliminating the 14" space previously needed without a condenser??????? Thanks for the help guys
nahaaw,
you want the whole fresnel to be lit. and with a condenser you only narrow the light to a cone. it won't focus to a point. that's the fresnels job. so if you use a condensor, you have to move the light further away to get the whole fresnel lit. but you also can use a fresnel with a much shorter focal distance that can focus the light without a condensor pre narrowing it...
you want the whole fresnel to be lit. and with a condenser you only narrow the light to a cone. it won't focus to a point. that's the fresnels job. so if you use a condensor, you have to move the light further away to get the whole fresnel lit. but you also can use a fresnel with a much shorter focal distance that can focus the light without a condensor pre narrowing it...
Condenser lens offer
I don't mean to capitalize on this situation, but I should have condenser lenses for sale at www.diylabs.org in about a week. They will probably be geared more towards the shorter FL fresnel lenses that make the image brighter, but should also work with the 14" FL fresnel lenses. As is typical whenever I start offering a new product, it will probably be about 3 weeks before I have any in stock to ship out, but I have to do it this way since I don't make enough profit on anything to be able to afford very many parts in advance.
I haven't ordered the lenses yet, but they are made specifically for this application and I'll even sell them at my actual cost if you guys will agree to purchase them knowing that it will take me a while to ship them. I think I can get these lenses for about $8 or $10 per lens, but I don't know yet - still researching.
Email me at diylabs@hotmail.com if you have any questions.
I don't mean to capitalize on this situation, but I should have condenser lenses for sale at www.diylabs.org in about a week. They will probably be geared more towards the shorter FL fresnel lenses that make the image brighter, but should also work with the 14" FL fresnel lenses. As is typical whenever I start offering a new product, it will probably be about 3 weeks before I have any in stock to ship out, but I have to do it this way since I don't make enough profit on anything to be able to afford very many parts in advance.
I haven't ordered the lenses yet, but they are made specifically for this application and I'll even sell them at my actual cost if you guys will agree to purchase them knowing that it will take me a while to ship them. I think I can get these lenses for about $8 or $10 per lens, but I don't know yet - still researching.
Email me at diylabs@hotmail.com if you have any questions.
don't worry, your helping us out finding the stuff we need. ok i'm out of this deal since i live in europe but the others will aprechiate this. i have some condensors myself but not very good once. heh and btw i had the same idea with the soup ladle for the reflektor. although i'm still having trouble lighting everything smoothly out...
NITEMARE said:
Thanks for understanding that I'm trying to help. If you ever need a lens or something like that, then let me know - I ship to the UK all the time.
The soup ladle reflector actually wasn't my idea originally, so I certainly can't take any credit for it. It seems to work decently well, although I sure would like to find a ladle that is more smoothly rounded than the one I have. If only I knew of an inexpensive source to get a really shiny sheet of metal - I could then stamp my own reflectors using a steam press. Oh well, these condensers should be of great help even with the soup ladle reflector! I'm hoping to ultimately boost the total output of my projector up to around 800-1000 lumens, and I think that is feasible with double-ended metal halides or the skinny 400 watt bulbs.
i thought the condesnor is only scattering the light better on the fresnel. but the main problem i have now is the fresnel. the only i got big enough is from an old overhead projector. i split it but it still does a bad job and is light absorbing as hell. my tft lcd is absorbing enough...
Alan, thatd be great if you start selling condenser's i cant find cheap ones anywhere! Let us know on the board when you have them up for sale, for sure I'll buy! Thanks!
Condenser Lens Update!!!
Finally I have found a good source for condenser lenses! The price per lens would be an estimated $10-$15 per lens! These lenses would make any small-bulb projector setup much brighter regardless of whether the bulb is metal halide, xenon, or even halogen. Also, the lens is made of tempered glass, so it will be durable even when nearly in contact with hot lamps. The downside is that I would have to order about 100 lenses as an opening order, and the lenses would not be here for about 4-6 weeks!! This is a tricky decision for me, so I would appreciate everyone's input. Please email me at diylabs@hotmail.com to let me know what you think. I would need to get a few people to preorder the lenses as I have done in the past with lens triplets and fresnel lenses unless someone wanted to loan me some money or start making donations to the website
. Thanks for your input!!
Finally I have found a good source for condenser lenses! The price per lens would be an estimated $10-$15 per lens! These lenses would make any small-bulb projector setup much brighter regardless of whether the bulb is metal halide, xenon, or even halogen. Also, the lens is made of tempered glass, so it will be durable even when nearly in contact with hot lamps. The downside is that I would have to order about 100 lenses as an opening order, and the lenses would not be here for about 4-6 weeks!! This is a tricky decision for me, so I would appreciate everyone's input. Please email me at diylabs@hotmail.com to let me know what you think. I would need to get a few people to preorder the lenses as I have done in the past with lens triplets and fresnel lenses unless someone wanted to loan me some money or start making donations to the website
. Thanks for your input!!I got a great deal on a Osram Powerstar HQI 150 watt kit. The reflector is about 6x4 inches. Can I use a condenser with this? Would it not have to be at least 4 inches in diameter and about 1.5 inches from the bulb itself? The impression I got was to use a condenser lens you need to use a much smaller bulb/reflector combo.
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