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Re: [Cameramakers] Journey to the dark slide
I measured the dark slides on one Fidelity holder and also one Lisco holder last night. They are both between 0.0325 and 0.330. So one should be safe using commercial 1/32 sheet. The second problem, of course, will be to get it cleanly cut to shape... I would suggest that a paint or epoxy type coating would be a difficult idea -- any such coating will be at least few thou thick and will make the resulting slide far too thick to work smoothly. Someone asked about a source for cold-anodizing chemistry: It's made by Birchwood-Casey and is called Aluminum Black. It is available from Fargo at www.micro-tools.com, and also from some of the major industrial tool companies, such as www.reidtool.com. Other versions of the product are also available for ferrous metals and brass. Don Feinberg [EMAIL PROTECTED] [EMAIL PROTECTED] ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
Re: [Cameramakers] Journey to the dark slide
John Cremati wrote: I have my doubts that these thicknesses will work in a 20x24 inch format.. If a thin aluminum sheet is used in the mammoth sizes it will have to be made of highly tempered aluminum alloy and very ridged.. In the book "Primitive Photography " A guide to making Cameras , Lenses and Calotypes, they specify 1/8 inch thick luan as dark slide material for just a 8x10 format.. Is there anyone on the list that has experience in such large formats as the 20x24 ? - Original Message - From: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Friday, September 27, 2002 9:52 AM Subject: Re: [Cameramakers] Journey to the dark slideI measured the dark slides on one Fidelity holder and also one Lisco holder last night. They are both between 0.0325 and 0.330. So one should be safe using commercial 1/32" sheet. The second problem, of course, will be to get it cleanly cut to shape... I would suggest that a "paint" or "epoxy" type coating would be a difficult idea -- any such coating will be at least few thou thick and will make the resulting slide far too thick to work smoothly. Someone asked about a source for cold-anodizing chemistry: It's made by Birchwood-Casey and is called "Aluminum Black". It is available from Fargo at www.micro-tools.com, and also from some of the major industrial tool companies, such as www.reidtool.com. Other versions of the product are also available for ferrous metals and brass. Don Feinberg [EMAIL PROTECTED] [EMAIL PROTECTED]
Re: [Cameramakers] message from Nettles. KV! etc.
Nope no virus attached in the message. On Fri, 27 Sep 2002 07:21:50 -0700, Gene Johnson wrote: I could not make out this message, but there was something in it about a worm. Did anyone's virus protection program go off? Gene -- Cedric Malitte, [EMAIL PROTECTED] on 27/09/2002 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
Re: [Cameramakers] message from Nettles. KV! etc.
Thanks Gene - Original Message - From: Cedric Malitte [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Friday, September 27, 2002 12:25 PM Subject: Re: [Cameramakers] message from Nettles. KV! etc. Nope no virus attached in the message. On Fri, 27 Sep 2002 07:21:50 -0700, Gene Johnson wrote: I could not make out this message, but there was something in it about a worm. Did anyone's virus protection program go off? Gene -- Cedric Malitte, [EMAIL PROTECTED] on 27/09/2002 ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] SuperSized Darkslides
Darkslide material is part of the reason I would construct a non-standard film holder and matching ground glass. If you could have thicker (deeper?) holders than your darkslide material could be thicker. Even sealed masonite would work. It would also take more bumping without marring the film surface than would something thin. A thicker slide of course raises the light trap question. Make the light trap longer and make the darkslide non-removable so you never have toworry about the gap. Formica's other big problem is it is brittle. But then so are some of my circa 1980 4x5 8x10 commercially made darkslides. Also to save on anodizing the aluminum, I often use flat black high heat paint. It dries quick, its thin, its matte black and you can quickly repair any scratches with another spray. Will ---William Nettles [EMAIL PROTECTED] Nettles Photo / Imaging Site http://www.wgn.net/~nettles Formica(TM) and other similar products is compressed paper with melamine plastic. It is useful for some camera parts where a slight warp isn't a problem A 24 in sq. darkslide would be very risky. I laminated wood veneer to formica and found that their expansion was too different and the veneer cracked. I believe conventional darkslides use a cloth/bakelite material. I've seen it in the Small Parts cat. but no thinner than 1/8 in. It ain't cheap. There was a posting a couple years ago on this list about anodizing aluminum. I wonder if that is a relatively cheap way to go? Black anodized aluminum would be very nice. ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Box Pan Brake
While constructing some light reflectors several months ago I had a hankering for a box and pan brake--but couldn't find one for less than $1000. I was at a place called Harbor Tools, I think its a chain, they had a brake, shear combo for about $300. Chinese made nothing you would add to your NASA shop, but it was heavyu duty and looked like it would do the trick for a camera bodger who only occasionally risks sheet metal cuts. ---William Nettles [EMAIL PROTECTED] Nettles Photo / Imaging Site http://www.wgn.net/~nettles Find out what's happening in Echo Park: [EMAIL PROTECTED] From: [EMAIL PROTECTED] Reply-To: [EMAIL PROTECTED] Date: Fri, 27 Sep 2002 00:37:12 -0600 To: [EMAIL PROTECTED] Subject: Cameramakers digest, Vol 1 #494 - 15 msgs 2) You really will need something like a brake or a horizontal shear to get the thin sheet metal cut with real accuracy and smoothness. You'll need to do that, as machining a thin sheet-metal edge is not so easy. ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
Re: [Cameramakers] message from Nettles. KV! etc.
Yup, mine went off and isolated the Klez worm. Matt Nope no virus attached in the message. On Fri, 27 Sep 2002 07:21:50 -0700, Gene Johnson wrote: I could not make out this message, but there was something in it about a worm. Did anyone's virus protection program go off? ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Journey to the Dark Slide 20x24
Hi William, I agree with you... I think just making your own holders and non standard back is the way to go ..Then design the back to the holder... The thicker holder has a big advantage of being more durable but the big disadvantage is the possibility of a light leak... I plan to use a dual light stop made from spring bronze or spring stainless steel weather stripping.. It is a V shaped strip that is very cheap available at McMaster Carr..Unfortunately it is 1 inch in width but on 20x24 holders, what's another couple of inches... . I had taken apart a graplex holder and found they use sort of a bronze spring "v" strip with fingers cut about every 1/8 inch. The assemble is then covered in a felt cloth..With the bronze V weather stripping these fingers could be easily cut on a fine toothed table saw with a simple jig.. As another idea how about making the holders and back 24x24 inches so that the film could be placed in any position with out having to position the camera on its side... I do not know how this could be accomplished yet but it is just a idea... I plan on making the ground glass back with out a spring system and the ground glass removed then holder will just lock into the back in its place . I think this will simplify things and prevent any possible light leaks while trying to maneuver such a large dark slide and heavy holder.. This is the site for Spring Metal weather stripping... ... I plan to cover it with some sort ofpolyester felt ...Any Comments on using this material?Look up number: 1115a2 http://www.mcmaster.com/ John Cremati--William Nettles wrote: Darkslide material is part of the reason I would construct a non-standardfilm holder and matching ground glass. If you could have thicker (deeper?)holders than your darkslide material could be thicker. Even sealed masonitewould work. It would also take more bumping without marring the film surfacethan would something thin.A thicker slide of course raises the light trap question. Make the lighttrap longer and make the darkslide non-removable so you never have toworryabout the gap.Formica's other big problem is it is brittle. But then so are some of mycirca 1980 4x5 8x10 commercially made darkslides.Also to save on anodizing the aluminum, I often use flat black high heatpaint. It dries quick, its thin, its matte black and you can quickly repairany scratches with another spray.Will---William Nettles
[Cameramakers] question and apologies for virus
Hello: I have been fighting with upgrading my AV software and got bit by an address-book virus today or yesterday - and I sure heard about it from everyone else's AV software that was working. I must have gotten 50 rejection messages! It was one of those Klez.H variations and it infected some weird things like my CD-R software (which was deleted and now has to be reinstalled). And my question - I bought (eBay - haven't received yet) an Ilex Process Paragon lens with some sort of motorized sliding scaling device (copy ratio I presume) 15 f/9 lens. This would be 381 mm..not quite 11 x 14 diagonal...maybe 10 x 12. 1) I am going on the assumption that process lenses make good enlarger lenses 2) What happens if 'too long' a lens is used for smaller format, say 8x10 or 5x7 negs...does it just mean enlarger starts out with a larger than 'normal' enlargment ratio? I know what happens from a camera point of view, but don't know what happens if I plan on using one enlarger lens for a variety of formats (for budget reasons). 3) Is this a good, excellent or barely decent lens for this application (and maybe a convertible camera/enlarger kluge)? Thanks . Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
[Cameramakers] Ilex Process Paragon
http://www.uptowngallery.org/ilex1.jpg http://www.uptowngallery.org/ilex2.jpg If anyone can identify what the mechanism did, it would be appreciated. Thanks Murray ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
Re: [Cameramakers] Journey to the dark slide
At 02:33 PM 9/27/2002 -0400, you wrote: John Cremati wrote: I have my doubts that these thicknesses will work in a 20x24 inch format.. If a thin aluminum sheet is used in the mammoth sizes it will have to be made of highly tempered aluminum alloy and very ridged.. In the book Primitive Photography A guide to making Cameras , Lenses and Calotypes, they specify 1/8 inch thick luan as dark slide material for just a 8x10 format.. Is there anyone on the list that has experience in such large formats as the 20x24 ? Guys, RE the relative hugeness of 24 in. sq. film, I now believe thinking in terms of conventional dark slide materialis is probably wrong. Using luan may be a very good idea. Also think about black foam core. It is terrific for experimental camera bodies. A stack of large film holders would weigh quite a bit. Also There should be a container that will hold them flat - like a an old wood tennis racket clamp. AZ Maker of Lookaround panoramic camera. http://www.panoramacamera.us or keyword.com lookaround ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
Re: [Cameramakers] Journey to the dark slide
Hi Alan, I think your right about the possibility of wood warpage on such large holders... I intend to try to make them out of alllnneeyyummm... You can epoxy aluminum together with rivets... You can also silver solder it.. I have a tig welder so I may risk the chance of heat warpage and try to weld it in key stress areas If I was looking at this material called Sintra with out knowing the name of it , I would call it black foam core... We are probably talking about the same thing It is actually a expanded PVC product and is reasonably stiff ( not as stiff as I would like though for 1/8 inch thick..) and extremely light weight.. It seems pretty durable as wellI am going to get a 20x24 x 1/8 piece this weekend and give it a light fast test in the sun with some film underneath The best part about it is it is cheap I think a 4 foot by 8 foot sheet is about $35 . If I am layering 1/8 x 1 1/2 aluminum strips to form the framework for the dark slide the edges of the black foam core are easily sanded to fit. John Cremati. - Original Message - From: Alan Zinn [EMAIL PROTECTED] To: [EMAIL PROTECTED] Sent: Friday, September 27, 2002 11:45 PM Subject: Re: [Cameramakers] Journey to the dark slide At 02:33 PM 9/27/2002 -0400, you wrote: John Cremati wrote: I have my doubts that these thicknesses will work in a 20x24 inch format.. If a thin aluminum sheet is used in the mammoth sizes it will have to be made of highly tempered aluminum alloy and very ridged.. In the book Primitive Photography A guide to making Cameras , Lenses and Calotypes, they specify 1/8 inch thick luan as dark slide material for just a 8x10 format.. Is there anyone on the list that has experience in such large formats as the 20x24 ? Guys, RE the relative hugeness of 24 in. sq. film, I now believe thinking in terms of conventional dark slide materialis is probably wrong. Using luan may be a very good idea. Also think about black foam core. It is terrific for experimental camera bodies. A stack of large film holders would weigh quite a bit. Also There should be a container that will hold them flat - like a an old wood tennis racket clamp. AZ Maker of Lookaround panoramic camera. http://www.panoramacamera.us or keyword.com lookaround ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
