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1. ## Thread: Is it a linear progression between 90mm and 150mm?

by reddesert
Replies
77
Views
2,059

### Re: Is it a linear progression between 90mm and 150mm?

When asking whether something is "linear" you always have to qualify, linear in what variable?

In this case, for example, focal length, image size on the film, field of view in degrees, or...
2. ## Thread: Shooting The Christmas Star . . .How?

by reddesert
Replies
8
Views
355

### Re: Shooting The Christmas Star . . .How?

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).. ...
3. ## Thread: Putting together lenses from scratch

by reddesert
Replies
8
Views
717

### Re: Putting together lenses from scratch

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...
4. ## Thread: Copal No 1 Shutter Stopped Firing

by reddesert
Replies
15
Views
687

### Re: Copal No 1 Shutter Stopped Firing

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...
5. ## Thread: Tilt an old lens a teeny bit off axis to improve image. Anyone ever heard of this?

by reddesert
Replies
13
Views
669

### Re: Tilt an old lens a teeny bit off axis to improve image. Anyone ever heard of this

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...
6. ## Thread: The first war to be photographed?

by reddesert
Replies
11
Views
649

### Re: The first war to be photographed?

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...

by reddesert
Replies
15
Views
883

### Re: Developer trays

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...
8. ## Thread: Jeff Wall essay on Anthony Hernandez

by reddesert
Replies
2
Views
598

### Re: Jeff Wall essay on Anthony Hernandez

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...

by reddesert
Replies
50
Views
2,887

### Re: Still Smokey

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...
10. ## Thread: Meniscus lens iris "sweet spot"???

by reddesert
Replies
17
Views
1,222

### Re: Meniscus lens iris "sweet spot"???

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,...

by reddesert
Replies
67
Views
3,486

### Re: Avedon

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...
12. ## Thread: Any tips on how to repair lenses with Balsam Separation?

by reddesert
Replies
22
Views
1,159

### Re: Any tips on how to repair lenses with Balsam Separation?

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...

by reddesert
Replies
32
Views
1,734

### Re: Review of new Ansel Adams book!

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...
14. ## Thread: Tripods in lightning storms?

by reddesert
Replies
20
Views
1,084

### Re: Tripods in lightning storms?

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...
15. ## Thread: Disastrous Consequences (solved: fog with Intrepid lensboard)

by reddesert
Replies
51
Views
2,255

### Re: Disasterous Consequences

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...
16. ## Thread: Flash Firing Before Shutter?

by reddesert
Replies
10
Views
524

### Re: Flash Firing Before Shutter?

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...
17. ## Thread: Gregory Crewdson's 'An Eclipse of Moths'

by reddesert
Replies
27
Views
1,554

### Re: Gregory Crewdson's 'An Eclipse of Moths'

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...
18. ## Thread: Chamonix 57N + Technika Lens Board

by reddesert
Replies
10
Views
673

### Re: Chamonix 57N + Technika Lens Board

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...
19. ## Thread: McKeowen's and all those cameras.

by reddesert
Replies
18
Views
1,131

### Re: McKeowen's and all those cameras.

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.

20. ## Thread: McKeowen's and all those cameras.

by reddesert
Replies
18
Views
1,131

### Re: McKeowen's and all those cameras.

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

by reddesert
Replies
21
Views
1,648

### Re: Hypo clear?

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...
22. ## Thread: Wratten & HEX numbers

by reddesert
Replies
9
Views
648

### Re: Wratten & HEX numbers

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...
23. ## Thread: Wratten & HEX numbers

by reddesert
Replies
9
Views
648

### Re: Wratten & HEX numbers

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...

by reddesert
Replies
10
Views
727

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...
25. ## Thread: Is there a free site that will host your images in their original full resolution?

by reddesert
Replies
32
Views
1,487

### Re: Is there a free site that will host your images in their original full resolution

WFH Sucks, a Haiku:

Hundred gig files from
detector at lab, summer
26. ## Thread: Washing Anti-Halation Backing on HP5

by reddesert
Replies
6
Views
439

### Re: Washing Anti-Halation Backing on HP5

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.
27. ## Thread: Glass plate negative storage

by reddesert
Replies
5
Views
350

### Re: Glass plate negative storage

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...
28. ## Thread: Fujinion W f5.6 210mm fuzzy at wide open

by reddesert
Replies
12
Views
697

### Re: Fujinion W f5.6 210mm fuzzy at wide open

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...
29. ## Thread: Film Holder Provenance for you Military Buffs...

by reddesert
Replies
2
Views
340

### Re: Film Holder Provenance for you Military Buffs...

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

post #2 suggests (Graflex) Riteway plastic film holder production started in 1950,
30. ## Thread: Chamonix 57N + Technika Lens Board

by reddesert
Replies
10
Views
673

### Re: Chamonix 57N + Technika Lens Board

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...
31. ## Thread: Smoke smoke everywhere

by reddesert
Replies
172
Views
7,377

### Re: Smoke smoke everywhere

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...
32. ## Thread: Seeking guidance on pairing a Nikon 150mm W lens with a Graflex Crown Graphic 4x5

by reddesert
Replies
18
Views
592

### Re: Seeking guidance on pairing a Nikon 150mm W lens with a Graflex Crown Graphic 4x5

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...
33. ## Thread: Looking for a count up timer for use with film development

by reddesert
Replies
18
Views
697

### Re: Looking for a count up timer for use with film development

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...
34. ## Thread: KEH and the "Copal BT" shutter

by reddesert
Replies
8
Views
3,868

### Re: KEH and the "Copal BT" shutter

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...
35. ## Thread: Chasing star trails with an 8x10

by reddesert
Replies
29
Views
1,472

### Re: Chasing star trails with an 8x10

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...
36. ## Thread: 15" Tele-Raptar front group FL question

by reddesert
Replies
7
Views
319

### Re: 15" Tele-Raptar front group FL question

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...
37. ## Thread: Calumet C1 Repair and questions

by reddesert
Replies
10
Views
644

### Re: Calumet C1 Repair and questions

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...
38. ## Thread: Focal length, distance, and depth-of-field: clarification?

by reddesert
Replies
19
Views
940

### Re: Focal length, distance, and depth-of-field: clarification?

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...
39. ## Thread: How To Properly Determine Infinity For a Lens?

by reddesert
Replies
25
Views
1,273

### Re: How To Properly Determine Infinity For a Lens?

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...
40. ## Thread: Focal length, distance, and depth-of-field: clarification?

by reddesert
Replies
19
Views
940

### Re: Focal length, distance, and depth-of-field: clarification?

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...
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