Re: UV lenses ??? pin hole lense ???

John Francis writes: Gerald Cermak wrote: Buy a used helicoid extension, mount a body cap to the front that is drilled to hold the pinhole. Voila! A pinhole zoom! Gerald You are a deeply disturbed individual. Keep it up! (I love the idea of 'drilled to hold the pinhole', too!)

Re: UV lenses ??? pin hole lense ???

Can I get that with USM and IS Gerald Cermak wrote: Buy a used helicoid extension, mount a body cap to the front that is drilled to hold the pinhole. Voila! A pinhole zoom! - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net

Re: UV lenses ??? pin hole lense ???

Treena Harp asks: Can I get that with USM and IS USM isn't necessary, as focusing is instaneous compared to USM. (everything is always in focus with a pinhole lens). IS? Well, it probably could be done easily, since there is only one element to move, the pinhole holder itself, which is a

Re: UV lenses ??? pin hole lense ???

Can I get that with USM and IS Shoot-you can have it with lettuce, onions, and a slice of tomato if you want. :-) Dan Scott (suddenly hungry) [EMAIL PROTECTED] - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't

UV lenses ??? pin hole lense ???

Hey folks, IR is fun and quite easy, the second challenge is UV... anyone tried to play with UV Normal lenses are around 360nm UV 320nm would be fun very few lenses go to 215nm what lense would go down to 200nm ? Also anyone know a mirror lenses without Refracting elements ? How to build a

Re: UV lenses ??? pin hole lense ???

Philippe Trottier wrote: Hey folks, IR is fun and quite easy, the second challenge is UV... anyone tried to play with UV Yes, but I haven't had much luck with it yet. (Getting ahold of a filter that reduces visible light but _passes_ UV would probably help with the things I was trying to

Re: UV lenses ??? pin hole lense ???

check out: http://www.pinholeresource.com/products.html#bodycap D From: "Gerald Cermak" [EMAIL PROTECTED] Reply-To: [EMAIL PROTECTED] Date: Wed, 14 Mar 2001 11:04:44 -0800 To: [EMAIL PROTECTED] Subject: Re: UV lenses ??? pin hole lense ??? Philippe Trottier write: I wa

Re: UV lenses ??? pin hole lense ???

Hi Philippe, I haven't tried taking photographs at these wavelengths, but I've had lots of experience with pulsed UV lasers and low-level UV and VUV (vacuum UV -- below 200 nm) photometry/spectroscopy. For UV, you need fused silica optics. Much more expensive than BK-7 or BAK-4 glass.

Re: UV lenses ??? pin hole lense ???

Gerald Cermak wrote: By a used helicoid extension, mount a body cap to the front that is drilled to hold the pinhole. Viola! A pinhole zoom! Gerald You are a deeply disturbed individual. Keep it up! (I love the idea of 'drilled to hold the pinhole', too!) -- John Francis [EMAIL

Re: UV lenses ??? pin hole lense ???

Philippe Trottier wrote: What kind of mirror should be used for UV purpose ? Pretty much anything that reflects visible light; typical metallized coatings reflect deep enough into the UV spectrum for your purposes. Just make sure you get a front-surface mirror, though; the glass of a

Re: UV lenses ??? pin hole lense ???

Hi Phillipe, If you need lenses for UV photography, Nikon makes a pair of them. They are the 50 mm. f/4.5 and 105 mm. f/2.8 UV-Nikkor. Of course, you will need a Nikon body to use them. Besides, they say these lenses are quite fragile, because they are made of fluorite and quartz glass. And I

RE: UV lenses ??? pin hole lense ???

Hi Philippe, My comments are interspersed below. Hope these help. Any lead where to talk and ask for these "toys" I know they are expensive... Edmund Industrial Optics (http://www.edmundoptics.com) now carries UV optics. Simple planoconvex and biconvex lenses are available for around USD