Search:

Type: Posts; User: reddesert; Keyword(s):

Page 1 of 9 1 2 3 4

Search: Search took 0.01 seconds; generated 50 minute(s) ago.

  1. Re: The F.64 BPX Back Pack does not seem to have a place for a tripod. What do people

    There are tripods with a leg that's a detachable monopod. One could use that as a hiking pole while strapping the rest of the tripod on one's back. I think that detachable-leg tripods are mostly...
  2. Replies
    11
    Views
    510

    Re: Packpack DIY frame-finishing question

    I'm impressed by building a custom wood frame. I hope this isn't taken as critical:
    - A foam insert with dividers would likely be protective enough. However, many non-hiking backpacks do not have...
  3. Replies
    21
    Views
    3,197

    Re: Rittreck View 5x7 camera manual

    Interesting - I'm not familiar with the Toyo 57G. Was that an interchangeable back with the same fitting as the usual Toyo-Sakai 4-3/4 x 6-1/2, or a uniquely 5x7 version of it?



    There's a few...
  4. Replies
    21
    Views
    3,197

    Re: Rittreck View 5x7 camera manual

    The Toyo / Sakai metal field 4-3/4 x 6-1/2 does have swing in the front. It unlocks with a chrome lever at photographer's right, bottom of the front standard. No front shift, no rear swing (and no...
  5. Re: My first Lens. Symmar-S 6,8 /360 in a Copal 3 shutter. What next?

    Because the maximum aperture of a lens is limited by the lens design, not necessarily by the mechanical opening of the shutter's aperture. The shutter's aperture lever may have travel beyond what the...
  6. Re: My first Lens. Symmar-S 6,8 /360 in a Copal 3 shutter. What next?

    It sounds like you need to understand how to mount an LF lens to a lensboard. The lensboard needs to have a hole that accepts the mount diameter (outer thread) on the rear of the shutter, and then...
  7. Re: Is this a Linhof Technika III lens board or something else?

    Yes, but there are many other cameras (some not made by Linhof) that take Technika-IV-style boards but don't have the exact same front standard as a Technika, so it's possible that somebody modified...
  8. Re: Is this a Linhof Technika III lens board or something else?

    A Technika III board is a little taller and narrower than a Technika IV board, and the light trap on the back is different.

    I would guess a Technika III board that someone added notches to so that...
  9. Re: Just bought a Fujinon 135/5.6 W ( first type )

    Yes, but sometimes the M sync delay mechanism is sticky. It's a little weird that it manages to move but so slowly as to take a 1/4 second. I have had lenses where it was just stuck, so the shutter...
  10. Replies
    17
    Views
    1,553

    Re: broken groundglass - need to replace

    I used 600 grit silicon carbide. I got a pound of it from a local tool shop that also caters to jewelry and rock-hounds (lapidary, rock-polishing). A pound of SiC grit cost $8 a few years ago and is...
  11. Re: Berenice Abbott's "Super Sight" at the MIT Museum

    I also read the article and was skeptical about the arrangement described. I think it's likely that Hank O'Neal's recollection was incorrect and that there was a single camera obscura / projection...
  12. Replies
    67
    Views
    4,228

    Re: Lens__ Circle of confusion

    Doremus, in your second paragraph you wrote "Diffusion is always present ..." but obviously meant to write "Diffraction is always present ..." - just for clarity.

    "Confusion" in imaging can refer...
  13. Replies
    67
    Views
    4,228

    Re: Lens__ Circle of confusion

    I've always seen "circle of confusion." That is mostly a photography term, not an optical science term. Generally (in English) diffusion refers to a different type of physical process, a multiple...
  14. Replies
    67
    Views
    4,228

    Re: Lens__ Circle of confusion

    It's a filled circle. I don't think that is the confusing part for most people.

    Other terms that could be used include "disk" (commonly used for the Airy disk as someone mentioned), and "spot...
  15. Re: Luna-pro advice. Which ones do you like and why?

    The spot meter attachment from the old Luna Pros does not fit on the Digital F, which is smaller. The Digital F is still available new as the "Sixtomat F2" (Gossen always had different model names in...
  16. Re: How to Mount View Camera Lenses to Lensboards

    I also have a Fujinon 210mm in the Seiko #1 shutter that is like a Copal #1 shutter but slightly larger. I've posted about it here before to assist people. It mounts in a 48mm hole versus the 42mm...
  17. Re: Telephoto Compression and “Super Sun” / Potato Masher Effect in LF?

    Something is wrong with this (simulated 35mm overlaid on 4x5) image. The image of the sun is improperly scaled for focal length. You can tell because the image of the sun should be 10x linearly...
  18. Replies
    18
    Views
    1,551

    Re: SOLAR Eclipse LF PINHOLE Advice

    Sorry, I didn't see this in time. The disk of the sun is about half a degree diameter, so about 1/110 radian. This means that to get any appreciable extended image of the sun, you need a very long...
  19. Re: Is hand check film available at Rome airport (FCO) in Italy?

    Nice photos! Were you there at a time or day that the Colosseum was closed? It looks quite early or late in the day from the shadows. I was there in spring of this year and the whole plaza was...
  20. Replies
    27
    Views
    2,258

    Re: National park closures

    Unfortunately as seasonal employees the Park bears are extremely vulnerable to layoffs during shutdowns, so it's a good thing this has been averted.
  21. Re: A question about unscrew off the front cell of Schneider Super Symmar 80mm XL len

    I wouldn't interpret the Schneider cautions about precision to mean that lens cells must never be touched. There isn't any mechanical degree of freedom to adjust when a lens cell stops as you screw...
  22. Replies
    23
    Views
    11,214

    Re: G-Claron casket set

    There's a review of the Wisner plasmat set by Jean-David Beyer on the LFphoto main page, dated Oct 1997: https://www.largeformatphotography.info/plasmats.html
    I think he used to post to the...
  23. Re: DIY shutter-speed tester: Informed opinions?

    Several years ago I assembled an inexpensive mini storage oscilloscope from a kit (a JYE Tech DSO150) for about US$20-30. I did a writeup of it on a guitar pedals forum, you can find it at the...
  24. Re: DIY shutter-speed tester: Informed opinions?

    The shutter speed app is very useful even in the free audio version and Fritz is very kind to make it free. Although it's not as correct as a real 2-point focal plane shutter tester, it can tell you...
  25. Re: DIY shutter-speed tester: Informed opinions?

    It's a phototransistor and a resistor. You can find details if you look around. I made one myself, and the homemade one works fine although you have to interpret the waveform that comes from it (it...
  26. Replies
    50
    Views
    12,222

    Re: The "Art" School is Dead

    I don't think one goes to expensive art school to be a famous artist. I mean, maybe that is one's ambition, but most graduates aren't going to become famous artists, just like most football players...
  27. Re: Giant Holmes, Booth & Haydens info wanted

    E. E. Barnard, among many other things, made a number of celestial photographs with a large lens he refers to as the "Willard lens," a lens he describes as 31" focal length and 6" clear aperture,...
  28. Re: What ever happened to rear swings AND tilts on field view cameras?

    It's not just Simmons who says that the position of the back determines perspective. Writers of books on the view camera such as Strobel and others have been saying this long before 2015. If one is...
  29. Replies
    58
    Views
    8,135

    Re: A Mess in Yosemite right now--a cautionary

    People are having fewer children, and that's what gives them the disposable income to go on vacation to Yosemite. It may be a special madhouse this summer, but the way to deal with that is to go...
  30. Replies
    6
    Views
    702

    Re: Do 62mm Extension Tube's Exist?

    I think that is a 62mm long extension for a telescope focuser for 2" diameter (50.8mm) eyepieces. Not what the OP wants.

    Spacing only the front cell of a lens away from the shutter and rear cell...
  31. Replies
    40
    Views
    3,163

    Re: Glass Dressing or coating for old lenses

    This is a good one too: Scratched Front Element, https://www.lensrentals.com/blog/2008/10/front-element-scratches/

    (typically, rear element damage has worse effects than front element damage).
  32. Replies
    40
    Views
    3,163

    Re: Glass Dressing or coating for old lenses

    Put a few drops of windex-type glass cleaner or lens cleaning or alcohol on a microfiber cloth, wipe gently, and dry. You shouldn't need to do anything more. Using anything that seems remotely...
  33. Replies
    34
    Views
    3,140

    Re: De Smidt Dedustinator 15

    There is an interesting DIY air filter called a Corsi-Rosenthal Box that was designed during the height of the Covid pandemic but would also be useful for this moment of wildfire smoke, and general...
  34. Replies
    40
    Views
    3,163

    Re: Glass Dressing or coating for old lenses

    There is a kernel of truth to the serendipitous origin story of optical coatings, although it's not about a photographer, cigarette smoke, or resolution; but respectively Lord Rayleigh, tarnish, and...
  35. Re: Servo controlled large format 3d printed leaf shutter

    Now that is pretty cool!

    Do you have any videos showing the shutter in operation?
  36. Replies
    222
    Views
    24,345

    Re: New 75mm Hypergon Lens

    Roosinov's patent is US2516724A, https://patents.google.com/patent/US2516724A/en?oq=us2516724 You have to download the PDF as the OCR'ed text is very poor.

    He uses "aberrational vignetting" to...
  37. Re: How to extend the focal length on a DIY lens?

    For simple lenses, the thin lens approximation is usually sufficient. If you have two lenses of focal lengths f1 and f2, and they are separated by a distance d that is less than the focal length, the...
  38. Replies
    20
    Views
    2,497

    Re: Metal field cameras - what was the niche?

    I can't "know" the answers to the original question, but suspect that part of it is that monorail cameras took longer to become the dominant studio / commercial tool than it seems in retrospect.
    ...
  39. Replies
    11
    Views
    1,362

    Re: Ground Glass Questions & Thoughts

    I made a ground glass for a 5x7. I used a 5x7" piece of picture frame glass, and some 600 grit silicon carbide I bought from a local rockhound/jewelers/tool shop, with another piece of glass as the...
  40. Re: Goerz Doppel-Anastigmat Series III No. 1 Question

    Here is a thread where I asked about a somewhat similar Serie III Dagor to the OP's. Mine had a similar deep barrel mount and was likely from a camera with a focal plane shutter, but if there had...
Results 1 to 40 of 359
Page 1 of 9 1 2 3 4