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I found Darkroom Automation's f-stop dial for the graylab timers to be very helpful.

https://www.darkroomautomation.com/support/grastops.pdf

I added a second spigot to my sink, connected to a fixed mixer and a foot operated valve. The idea being that I can step on the foot valve to deliver tempered water to rinse my hypo laden hands...

I pushed my wife in her manual chair up to the Lady Bird Johnson Grove in Humboldt County back in the late '80s. This was prior to the ADA. It was a difficult push and I remember feeling that we did...

Great answer Doremus. It reminded me that Sinar cameras have a mechanical calculator built into the rear standard to do this for you. I was expecting to find a constant ratio between focus spread...

Looks like no. Different order numbers apply. See:

http://www.cameraeccentric.com/html/info/cambo_1.html

Makes sense, I know from experience that lens boards are incompatible so it would be...

When I wanted to mount my magnesium Calumet C1 8x10 to an older Bogen tripod I enlisted the aid of my father-in-law, an amateur machinist. The problem with the Calumet was that while the mounting...

Revised:

I agree with Brian. Large Format is not so much more difficult than smaller formats as it is simply different. Loading film holders seems to be intimidating for some folks, but after a...

Very succinctly: Any lens design is optimized for a particular magnification, although some designs hold their corrections well over a wide range of magnifications. Taking lenses are designed to...

You may also consider the maximum enlargement that you would be able to make with such a long lens. My Omega DII allows only about 37 inches (940mm) from negative stage to easel. With a 180mm lens,...

My recurring recommendation:

Quality Light Metric Co
7095 Hollywood Blvd Ste 550
Los Angeles, CA 90028
(323) 467-2265

They repair and calibrate meters including replacing some selenium...

One cautionary tale. This weekend I had a chance to get away and make a few exposures. I had little time to put together my kit and so just grabbed the tripod and bag that I generally have ready. ...

Well yes, but, while the longer lens does have a larger image circle, it will also require greater shift to take the same picture. In fact when photographing a tall building from a close distance,...

The Reflector of my 8x10 Elwood has a lot of dark area, but the person selling me mine said that it does not matter. My experience has been that that was not too much of a stretch of the truth. I...

Dan, How do you find the 80mm WF Ektar? I don't get much use out of my 6x9 view camera rig, a reducing back and Graflex roll film holder for my 4x5 Cambo. I have 65 and 100mm lenses, plus longer...

6" Dagor

I use these in the darkroom.

Well some Americans, maybe. South Bend's famous university has already been cited. But I have lived my life in two US States that offer an abundance of unconventional pronunciations for...

That looks like the B&J monorail variation on the Calumet C1 8x10 camera. The lens board you describe sounds like the C1 board, which was recently available from Calumet, but fortunately is also...

My speculation (totally unsupported by anything that might pass as fact) is that the Repro-Clarons came from an age when workmanship was held in high esteem in its own right and was not totally...

Not stated above is that when used in a process camera where flat original art is imaged onto a flat piece of film all parts of the image are in focus, so aperture shape has no consequence. I bought...

Do you mean the window that illuminates the diaphragm?

Am I misreading your chart, or do I see diffraction actually improving resolution in certain ranges. That would seem to suggest that you have a sign error somewhere.

I think that Struan was...

You may want to read through through following thread:

http://www.largeformatphotography.info/forum/showthread.php?t=36745

Please look at the two graphs attached below representing calculated data and please do not overlook that the two charts have very different horizontal and vertical scales.

These are an attempt...

Be aware of what you ask for. Unless you buy the latest multi-kilobuck lens from Schneider or Rodenstock, you are going to be compromising sharpness. Now, is it a compromise that you will see with...

Thanks for posting. I have a very decrepit E3 and that cold light head and have been considering just such a conversion.

Like many other rules taught in photography classes "1/3 in front and 2/3 in back" should be recognized as a rule of thumb that conveys some useful guidance, but is not technically true.
...

Even symmetrical lenses have a non-zero nodal point separation.

Dan gave the applicable formula, but interpreted it incorrectly. f*(1+m) gives the image distance, not the extension from the infinity focus position. Consider the following familiar situations:
...

ic, Ken's Wikipedia reference includes a link defining a normal lens. It is defined in terms of the print size and the related normal viewing distance so if you are in a mood to question all uses of...

Rick,

I think that your definition of perspective taken from the world of mechanical drawing is essentially the same as that I applied, and I thought that your comments to Ken starting with post...

Ken,

Is there a reason why you chose to make your four photos from the same position?

Clearly making your four photos from distances proportional to focal length so that the building (or other...

For a lark, it might be easier to DIY a Goerz Hypergon style fan.

I am relieved to learn that it is not Wisconsin that is occupied by Canadians. I would hate to think that foreigners have control of so much of our beer production.

Oh Yeah, they do.

I am unhappy with them just now. I recently ordered an EX+ used Samsung NX10 body from KEH but called first to see if the manual and software were included. I was plainly (and too quickly, I...

Retouching stand?

As Frank said, you are bound to get a lot of conflicting advice. I for one, cringe when somebody inevitably recommends a press camera to a person whose interests are principally studio or landscape...

Mr. Brown seemed to be suggesting yet a different erroneous way of calculating magnification when he said that a 64 x 80 would be 5x from a 4x5 neg. I am guessing that he took magnification to be...

Not "from the ground glass", but from in front of it.

Sinar has offered a number of products that work similarly.

Some folks use incident meters, others reflected. To say that one is superior or more natural than the other would be to invite a flame war that would not shed much light.

That said, I own both...