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Old December 28th, 2004, 05:15 AM   #1
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DIY Reflector/Compound camera lens?

Hi,

I am doing preliminary research into using a reflector lens, like what is use in refelctor telescopes, as a conventional camera lense. My reasoning is to get better image per cost, and a lot more light gathering power than normal lense. There is the possibility to do a compound lens, using bother reflectors and normal lenses, instead.

The problem is that I don't know much about lens systems and need some advice on how things work, problems and suitabilities.

One thing that occurs to me is that all the reflector lenses for cameras I have seen, and telescopes of course, are telescopic. It appears that a normal angle lense should be possible, but are there real problems against this?

If anybody really knows their stuff please let us know.


Some very basic stuff on how reflector works:
http://science.howstuffworks.com/tel....htm/printable

Thanks

Wayne.
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Old December 28th, 2004, 06:52 AM   #2
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Perhaps look up Maksutov-Cassegrain and Schmidt-Cassegrain, with or without the -.

From the little I know and it is very little, you deny yourself ability to control exposure via a lens iris when using these types.

Slightly off this topic, the older photocopiers have a reflector lens which you can do some weird stuff with but the image path through the lens to a focal plane is not along the same axis to the rear but projected back out through the front.
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Old December 29th, 2004, 01:10 PM   #3
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Thanks Bob. I'll look at that in the new year, I just spent all night trying to get this computer to do what it should ;(

Would putting the iris after the mirror and before the image plane be able to solve the Iris problem?

Thanks

Wayne.


-----Further questions

I wonder how they go on zoom, focus and DOF?

I see some designs with the lense out the side and some with the lense out the back, I wonder what the compromisers are.
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Old December 29th, 2004, 01:34 PM   #4
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Dear Wayne
take it this way It can be done,
it was not the need to do it
as for short focal the lenses are compact
for extrem telephoto there
is an economocal need
as it is much cheaper as to have 20 or more lenses.
for a 50mm I do not know
there are lenses 1.4 or even 1.1 leica 35mm
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Old December 31st, 2004, 10:14 AM   #5
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I have had a prelliminary look at mirror prices, and I think it might be possible to do a much cheaper and lighter lense of cinema quality in small volume, or home made. So instead of spending thousands, for us it might be hundreds, also the lite design is good for any handheld, portable, or low light use ;) But again, the compromises of a mirror lense are what will sink or float that that dream. Unfortunately, as most people are away, we will probably have to wait weeks to get a propper discussion going, so I might have to do another post then.
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Old January 6th, 2005, 12:11 PM   #6
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Well I am making progress on the subject ("mirror lens" works better than those search terms) but research is proving difficult as I am dizzy at the moment.

It's exciting, it looks like I can resolve most, if not all, the problems of the mirror lens (with zoom and aperature). I have a few leads on some things, and one of them is the solution I was going to implement anyway. I'm sure that with the other optical ideas I have been developing I could do some interesting things.

I'll see how I go, but I am starting on a very low cost laser projector project again, so I am going to deviate to that.

Thanks

Wayne.
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