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It depends what kind of picture you are trying to make.

At closest conjunction Jupiter and Saturn were 0.1 degree = 6 arcmin apart (for comparison, the moon's apparent diameter is 30 arcmin).. ...

Surplus Shed has some threaded barrels and retaining rings intended for people to build telescope eyepieces, that may be useful if you can figure out ways to mount the elements to the ring or within...

I just tried this with a very similar looking Copal shutter (like yours it has the two aperture scales, probably originally for a convertible Symmar), and there is a little detent between the two...

Lens aberrations depend on the focus distance. So it's possible you were using lenses computed for "normal" ranges like infinity to 1:10, but focusing it at a large reproduction ratio of 1:4 to 1:1...

I like attempts at historical deduction, but when that Errol Morris discussion went into the third page of if-this-no-maybe-that, I began to sympathize with Thomas Kuhn, whom Morris claims (no...

This is a delightful project.

I don't have a good developer tray story, but this reminded me of a developing tank. I was in high school and struggling to learn B&W developing with my dad's old...

Thanks for that. A really interesting read. I appreciated Wall's placing this work in the context of "street photography" both evolving from it and against it.

A few of the photos can also be seen...

FWIW I was camping and hiking in Yosemite from Oct 26-31. At the beginning on Oct 26 it was noticeably hazy in the Valley and at night there were many visible particles in a flashlight beam, as if...

Lens design books have discussions of this. In Warren Smith's "Modern Optical Engineering" he works it out that the ideal position for the stop is about 1/6 of the focal length in front of the lens,...

Good article,
it's interesting to think of someone as top of their game as Avedon (whether we like him or not) still striving for acceptance or to make a break into a new kind of work.

Something...

Methylene chloride is a very strong solvent that is a significant health hazard (as in, touching it momentarily won't poison you, but major inhalation or skin exposure can cause various kinds of...

Rebecca Senf is giving Internet (virtual) talks/presentations on the book and subject periodically, in lieu of a book tour I imagine. There's one next on Oct 21, 2020. If you miss that there might...

Lightning can do weird things, the potentials are so high that it will jump across objects that are insulators under "normal" voltages. (Rubber caps on tripod feet or rubber soled shoes are no...

Picture 4 here shows the retaining ring not fully seated into the lens board. When this happens, the rear element may also not be fully screwed into the back of the shutter, and there could be light...

Are you sure that the shutter doesn't have an M/X switch and that you haven't accidentally bumped it to M since the previous time you used a flash? Because M sync will cause exactly what you're...

I guess that most of you who are familiar with Crewdson's work know that it's highly staged and lit. The behind the scenes photos at the first link Randy posted show a few examples, such as (if this...

Yes, exactly, as Bob says (of course he's the expert) - that's a genuine Linhof board, but it's for a 4x5 Technika III. It differs from the Technika 4/5 board that many cameras have adopted as...

I know, but the OP was asking for information on a Kodak 2D and Kodak, Eastman, Folmer and Schwing; so piercevaubel.com is a more promising place to find information than McKeown's.

We're about...

Have you browsed http://www.piercevaubel.com/cam/index.htm "Wooden Field Cameras of the United States: 1870's-1930's" ?

It likely won't answer your specific question, especially because large...

Here is an MSDS for Perma Wash that lists a couple of ingredients: https://art.illinois.edu/images/documents/MSDS/Darkroom-SDS/Heico-Permawash.pdf
Ammonium sulfite and sodium ethylhexyl sulfate are...

If it's just one warming/cooling adjustment rather than a general specification for many Wratten filters ... I am not a Photoshop guru, but Photoshop may have an approximation to this adjustment for...

I don't think there is a simple way to translate them. Filters are subtractive, while the RGB hexadecimal codes for colors displayed on your monitor or similar are an additive color system. What you...

Interesting information. Have any of you tried a similar test in the sun, without window glass intervening?

There is an Ikea desk lamp that some people have recommended for this purpose. I don't...

WFH Sucks, a Haiku:

Hundred gig files from
detector at lab, summer
heat and slow downloads.

I found that in some B&W films a lot of the colored dyes come out in the wash aid (I typically use Perma Wash). You might consider doing a wash aid step in the hanger rather than the holder.

As far as I know, astronomical glass plates tended to be filed in something that looked like a envelope / manila folder made for the size of the plate, open on one side. I don't know if it was made...

Pictures would help.
I took post #4 to mean that the good lens is the one with a bent filter ring.

It's a little strange to have a modern lens that is so bad that you can see its softness on the...

https://graflex.org/helpboard/viewtopic.php?p=28032

post #2 suggests (Graflex) Riteway plastic film holder production started in 1950,
and that one might learn more about this history by studying...

It's narrow side to side? How wide is it? Does it have clipped bottom corners? Is the circular light trap on the back raised or not?

The Technika IV board is about 96x99 mm WxH with clipped bottom...

A friend of mine was planning to start a High Route hike on Sunday, southbound, but bailed before starting due to the smoke. The Sierra and Inyo NF are now temporarily closed for hiking. He reports...

An aftermarket Graphic board for a #0 shutter should be fine. You can get them on ebay and possibly from shops that sell LF equipment.

The shutter PC outlet will work fine with an electronic...

I use a couple of free iphone apps (called Develop! and Darkroom Clock) that have countdown, not count up, timers, but you can preset a sequence (like 10 min dev, 1 min stop, 4 min fix, etc) and just...

KEH's designations are a little cryptic but I'm pretty sure that many of their LF lenses are listed as "BT," meaning "this shutter has B and T in addition to the normal timed speeds." There are some...

When the moon is down or new you will have much, much darker skies. If the moon is a thin crescent and you're facing away from it (which you should be, shooting North) then it doesn't brighten the...

The usual design for a telephoto lens is front group(s) with positive power (converging) followed by rear group(s) with negative power. The rear groups make the bundle of rays converge in a longer...

There are Arca style plates that are longer than normal and have two screws or a slot in which the screws can move, so you could hopefully get both screws to line up with your mount holes. Like...

There's no real discrepancy in the two examples you posted in the first post. There is a mistake though. Go back to the online calculator and try the numbers for the 135mm again. You have:



It...

I don't really understand what the argument is here.

To set the infinity stops, Linhof doesn't focus on the Frauenkirche. They presumably use an autocollimator to produce a virtual target at...

Choice of lens and subject distance should be dictated by what image you are trying to make. With that said, to first order:

- when you change the subject distance to get the same horizontal...

This is the second time you've said something like "Infinity at 5.6 and 150mm is assumed at about 24m, because of the hyperfocal distance at about 47m," and I think that's misleading. 24m would be...