Years ago I ran tests of VC papers with a variety of OC filters and they will fog the papers, though slowly. I covered the OC filters with a sheet of dark red acetate and there was no fogging even...
Type: Posts; User: Michael Gudzinowicz; Keyword(s):
Years ago I ran tests of VC papers with a variety of OC filters and they will fog the papers, though slowly. I covered the OC filters with a sheet of dark red acetate and there was no fogging even...
It does look more like anodized aluminum than jewelry. It was meant to be used - not admired on a shelf - and does look like a knock-off replica. I do wonder if anyone really needs it or most of the...
I often used a sharp pencil on the ground glass itself. You may want to take the opportunity to use a small amount of dilute varnish to "fill" the ground glass at the center and a few other...
It would seem that's the case. They sold one Leica finder for a couple of hundred dollars which hardly is the cash flow required to support the enterprise if they actually had purchased their...
My comments were from the Book of Pyro. I agree with John that more exposure is desirable. I usually rate films a stop or more below the minimum acceptable EI promoted by manufacturers to get good...
An acid stop partially inactivates developing agents by lowering the pH into a range where the agents are less active, and by dilution. In the emulsion, the rate limiting step is diffusion so stop...
Using a development time of 13' @ 70F for HP5+ @ EI 320,
the N-3 time would be 7' @70F @ EI 160 (+ 1 stop).
PM sent with manual.
For consistency during one session, I'd suggest using as large of a developer volume as possible to avoid rapid exhaustion. Also, if you are using Dektol, dilute it 1+1 rather than 1+2. The capacity...
No... If you dilute the developer, the capacity is reduced by the dilution factor for the same volume of developer. In other words, the capacity of one liter of ID11 is 40 sheets, while one liter of...
Usually marks will affect resale value, but if it is a "prized lens" and still performs well, its value to you should not be diminished.
Performance will depend upon the specific damage. If the...
Both of those lenses cover 45 to 46 degrees (500-520 mm) which would appear to come up short of the 560 mm or so circle required for 14x17. The best bet in the 600 mm focal length would be the...
E6 in C41:
3827
Digital negative image:
3828
A number of people have commented on different focusing methods and effects of diffraction, defocus, etc. in the rec.photo newsgroups.
For the past 20+ years I've been using a simple calculator...
Duane, The 300 Xenar will cover 8x10. If the one you are considering is an older lens (pre-1940-50), it is likely that performance (sharpness) will just be adequate for 4x5. In any case, it is a...
If the enlarger uses the newer square bellows like the MXT and 45V, look under the lens stage and there's a plate which holds the lens boards. Remove the three screws, and the holes should match...
An enlarger is nothing more than a macro camera that takes a "photo" of the negative or chrome in the carrier. The macro formulas for extension and effective aperture apply.
This is one of my old rpd posts. It doesn't include reciprocity failure, but for
LF's somewhat limited print magnifications, that isn't a problem.
Suppose that your 15 sec, 8x10, was an 8X...
Are you sure that the older 6/2 lens isn't a Graphic Claron, and the newer 6/4 design, a G Claron? Completely different lenses...
You might have more luck looking for Emmet Gowin's photos.
1 second = "Ansel Adams"
Most commercial grade "sodium bisulfite" is actually bisulfite with a small amount of metabisulfite and water. Sodium metabisulfite may be regarded as an anhydride or "dehydrated" form of bisulfite....
It may not be a lens problem per se. Since storage under conditions of low humidity didn't remove the condensation, the lens would appear to be fairly well sealed. However, gas exchange with the...
Gene, You might try focusing on the lit filament of a clear glass electric bulb, and then stop down to see if focus shifts or if there's another problem. Try it on and off axis.
I agree with Pat - it looks like a rebranded Wollensak. The person from whom you purchased it, also has sold the Wollensak version (see EBay item 150073176856). The pertinent portions of the...
Check the "Details" tab accompanying the following photo:
http://photo.net/photodb/photo?photo_id=3651794
If the lens board fits well and is tightly held to the front standard, you should not have a problem with light leaks. That has been my experience with a dozen or so boards which lack the lip.
...
Here are a couple of links:
http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=00B4Up
http://www.kphoto.com.tw/front/bin/ptdetail.phtml?Part=AHV001
I haven't touched one, but from the...
Freestyle usually has sheets of lith film in stock. Lith film has an emulsion similar to paper with exceedingly fine grain and a comparable EI of around 4. Most are ortho films (Tech Pan was an...
As Bob mentioned, each element of the "sandwich" filters are not planar and imperfections introduce a variable but real difference in focal length over the filters surface. A good filter should be...
Simply use lith film which has a contrast and exposure range similar to B&W paper. Expose for the high values in the positive, and develop for the shadow density. You will have to experiment with...
Try to take a workshop or darkroom course before making a commitment to any layout. If you do that, you'll have a better appreciation for the work flow, and you'll have an opportunity to discuss...
There are a couple of probable causes. If the fixer has been used, it may contain a significant amount of complexed silver which will react with sulfide ions to form an insoluble silver sulfide...
The Ebony website in reference to the RW45 states: "Accepts both 4x5 International Standard and 6x9 Graphic Standard roll film holders (Horseman, Mamiya RB67 etc.): format reducing adapter required...
Well, they do give the impression of "precision" until you learn to ignore them.
There are a couple of situations where they may be useful. The first is if you're doing copy work and forgot your...
My grid lines are drawn with a thin lead pencil, a T-square, and a ruler to mark the spacing.
In practice (for instance photographing a building), I ignore the lines and use the bubble levels of...
Sheldon,
I have a DXII which should have a back similar if not identical to your camera. Mine has an original Wista combination screen with a GG surface facing the lens and the Fresnel surface...
You could use an enlarger with lenses mounted on a board. The focal length of a "thin" lens would be fl=(2 + 1/M +M) * dist where "M" is the magnification and "dist" is the carrier to easel distance....
If the manufacturer can't help, try: http://www.smallparts.com/components/
Edwal appears to be distributed by BKA. Try this link for technical information on Edwal products: http://www.bkaphoto.com/technical_info.asp
Also, see the darkroom section.