Re: [Cameramakers] Speed Graphic Enlarger
Gene, Sounds good. Does it get real hot like those cheap halogen floor lamps? They would work good but they get about a million degrees. Matt --- Gene Johnson [EMAIL PROTECTED] wrote: I was looking at the light I have on my patio and it looks like a real candidate. I bought it at Home Depot and it's rated at 27W but it's real bright. It has four small tubes laid out flat, which should make it easy to get a nice even distribution. Gene Robert Stoddard wrote: Hi Gene, Since the only real question that I can see is about the spectral quality of the light, I would be tempted to try a compact fluorescent if BW enlarging is what is wanted. Seems to me there is a good enough chance of success to make it worthwhile. Bob S. From: Gene Johnson [EMAIL PROTECTED] Reply-To: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: [Cameramakers] Speed Graphic Enlarger Date: Fri, 15 Jun 2001 08:24:14 -0700 Robert I was thinking about that too. It sure seems like that might work great but then I know right next door to nothing about this. Gene Robert Stoddard wrote: Here's another idea: I have been intrigued by the possibilities of using what are called compact fluorescent bulbs to form a light head. These lamps are designed to replace an ordinary screw-base household bulb and provide fluorescent advantages (low power consumption and heating with high light output and long life) in ordinary household lamps. I see no reason why they couldn't be used to make a good diffused cold-light enlarger light head, unless the spectral output of the bulbs is a problem. RKS From: [EMAIL PROTECTED] Reply-To: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: [Cameramakers] Speed Graphic Enlarger Date: Wed, 13 Jun 2001 19:16:25 EDT Hi Matt, I think your on the right track with the multiple lights and the diffusing material. I tried a piece of lexan under the condensors of my D5 and it did work giving a nice diffuse light source,but the light output was reduced dramatically and made the exposures longer than necessary. I tried a higher wattage lamp but then this smell of burning appeared so I gave that up. I have thought about using one of those 200 watt long life fluorescent bulbs. I also had another idea thanks to a neighbour who installed one of those outdoor mercury vapour lamps it kinda looks like an enlarger lamp housing and by the light it puts out bright enough,maybe you could check one of these out at a d.i.y place. My final idea( but not sure of the power aspects of it) would be to use the halogen lamps from car headlights ,maybe you could obtain a couple of volvo headlights and place some opal glass in front or make a mixing box and bounce the light onto the diffusing bit. you would need a power supply for the 12v but the lamps are cheap. Also along this idea what about those searchlights used for hunting they maybe bright enough. hope this helps some and let us know how your experiments go Regards Andy _ Get your FREE download of MSN Explorer at http://explorer.msn.com ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers _ Get your FREE download of MSN Explorer at http://explorer.msn.com ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers __ Do You Yahoo!? Spot the hottest trends in music, movies, and more. http://buzz.yahoo.com/ ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
Re: [Cameramakers] Speed Graphic Enlarger/spectral trouble
On Mon, 18 Jun 2001, Matt Mengel wrote: I think I have enough info to get started BUT, there have been some concerns here as to spectral problems with different light sources. Can anyone shed some light (sorry) on what the problem(s) would be. I am not at all familiar with this. If I used a source with the wrong color temp. what would happen? I'm speaking in the BW sense of course. The issue is that the sensitivity of photographic emulsions depend on the frequency of the light used to expose it. This is a common variable between different enlargers. No two light bulbs are quite the same, and different enlargers use different technologies (cold light or flourescent, incandescent, halogen, etc.). The upshot of this is that if you cut up a sheet of enlarging paper and exposed it under different enlarging systems you would get varying exposure times. Another twist on this is that modern variable contrast papers use two different formulations in the emulsion. One is a low contrast emulsion that responds to one color and the other is a high contrast emulsion that respones to a different color. I think the colors are green and blue, but don't remember for certain. This allows you to adjust the print contrast by changing the relative amounts of each color of light through filtration. The limits of the possible changes depend on how much of each of the two colors of light are emitted by your light source. So, as far as what would happen: - First, I'm not certain that there is a particular standard color temperature for BW enlarger lights. Maybe, but I don't know it. If I had to guess, it is probably daylight at around 5500 Kelvin. - Your enlarger will print with different exposure times compared to your so-called standard light source. - You will likely have a different contrast (filtration) range than someone with the standard light source. The good news is that you will calibrate any enlarger for your printing times, and that you can check your maximum and minimum printing contrast ranges. That is really all you'd need for BW. (For color the filtration range becomes a much bigger issue.) - Wayde ([EMAIL PROTECTED]) ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
Re: [Cameramakers] Speed Graphic Enlarger
Hi Gene, This is very interesting: I have several of these lamps, but I have never found one that had the tubes laid out flat-- mine are at 90-degrees to one another, like at 3, 6, 9, and 12 o'clock. If yours are laid out flat and parallel, then I would think that just 2 of them placed side-by-side with the tubes parallel would cover a 4 X 5 negative. Bob S. From: Gene Johnson [EMAIL PROTECTED] Reply-To: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: [Cameramakers] Speed Graphic Enlarger Date: Mon, 18 Jun 2001 07:42:39 -0700 I was looking at the light I have on my patio and it looks like a real candidate. I bought it at Home Depot and it's rated at 27W but it's real bright. It has four small tubes laid out flat, which should make it easy to get a nice even distribution. Gene Robert Stoddard wrote: Hi Gene, Since the only real question that I can see is about the spectral quality of the light, I would be tempted to try a compact fluorescent if BW enlarging is what is wanted. Seems to me there is a good enough chance of success to make it worthwhile. Bob S. From: Gene Johnson [EMAIL PROTECTED] Reply-To: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: [Cameramakers] Speed Graphic Enlarger Date: Fri, 15 Jun 2001 08:24:14 -0700 Robert I was thinking about that too. It sure seems like that might work great but then I know right next door to nothing about this. Gene Robert Stoddard wrote: Here's another idea: I have been intrigued by the possibilities of using what are called compact fluorescent bulbs to form a light head. These lamps are designed to replace an ordinary screw-base household bulb and provide fluorescent advantages (low power consumption and heating with high light output and long life) in ordinary household lamps. I see no reason why they couldn't be used to make a good diffused cold-light enlarger light head, unless the spectral output of the bulbs is a problem. RKS From: [EMAIL PROTECTED] Reply-To: [EMAIL PROTECTED] To: [EMAIL PROTECTED] Subject: Re: [Cameramakers] Speed Graphic Enlarger Date: Wed, 13 Jun 2001 19:16:25 EDT Hi Matt, I think your on the right track with the multiple lights and the diffusing material. I tried a piece of lexan under the condensors of my D5 and it did work giving a nice diffuse light source,but the light output was reduced dramatically and made the exposures longer than necessary. I tried a higher wattage lamp but then this smell of burning appeared so I gave that up. I have thought about using one of those 200 watt long life fluorescent bulbs. I also had another idea thanks to a neighbour who installed one of those outdoor mercury vapour lamps it kinda looks like an enlarger lamp housing and by the light it puts out bright enough,maybe you could check one of these out at a d.i.y place. My final idea( but not sure of the power aspects of it) would be to use the halogen lamps from car headlights ,maybe you could obtain a couple of volvo headlights and place some opal glass in front or make a mixing box and bounce the light onto the diffusing bit. you would need a power supply for the 12v but the lamps are cheap. Also along this idea what about those searchlights used for hunting they maybe bright enough. hope this helps some and let us know how your experiments go Regards Andy _ Get your FREE download of MSN Explorer at http://explorer.msn.com ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers _ Get your FREE download of MSN Explorer at http://explorer.msn.com ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers _ Get your FREE download of MSN Explorer at http://explorer.msn.com ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
Re: [Cameramakers] Speed Graphic Enlarger/spectral trouble
Hi Matt, The problem is that fluorescent lamps don't have a continuous spectrum of colors of light as a hot filament lamp does. This probably would not be a problem if you are using single contrast-grade BW enlarging paper, since it would only affect the time required to print. If using multi-contrast paper, it might cause some trouble because of the fact that the color of the light must be changed to get the different contrasts. RkS From: Matt Mengel [EMAIL PROTECTED] Reply-To: [EMAIL PROTECTED] To: Cameramakers [EMAIL PROTECTED] Subject: [Cameramakers] Speed Graphic Enlarger/spectral trouble Date: Mon, 18 Jun 2001 07:18:41 -0700 (PDT) Thanks to everyone on the speed graphic light head stuff. I think I have enough info to get started BUT, there have been some concerns here as to spectral problems with different light sources. Can anyone shed some light (sorry) on what the problem(s) would be. I am not at all familiar with this. If I used a source with the wrong color temp. what would happen? I'm speaking in the BW sense of course. Also, I mentioned earlier the Ansel Adams book, The Negative. After I actually READ the book instead of just reading captions, I got a little more insight on the type of enlager he was describing. If anyone is interested just about any library has this series. Thanks Matt __ Do You Yahoo!? Spot the hottest trends in music, movies, and more. http://buzz.yahoo.com/ ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers _ Get your FREE download of MSN Explorer at http://explorer.msn.com ___ Cameramakers mailing list [EMAIL PROTECTED] http://rmp.opusis.com/mailman/listinfo/cameramakers
