Search:

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

Page 1 of 23 1 2 3 4

Search: Search took 0.08 seconds.

  1. Replies
    6
    Views
    334

    Re: 37mm Mamiya RB lens on a Plaubel 4x5

    That _is_ the normal operation. This is a leaf shutter lens for a reflex camera. So when it is on the RB and armed, the lens is open so you can see through your viewfinder. When you fire it, it...
  2. Re: Focusing on the GG: am I missing some optical principle?

    I have no idea of the f-value of loupes but I guess that the same DOF applies to them as to lenses?
  3. Replies
    2
    Views
    268

    Re: a Compur shutter with issues

    I got out a more powerful loupe and indeed it looked as it is the plating. So I torn off all loose plating. After that I gave it a buffing with a fibre glass "eraser". Up to the next stage to get...
  4. Replies
    2
    Views
    268

    a Compur shutter with issues

    I'm taking apart the Compur shutter of my Devin camera. The lens is a Dogmar 5.5" f/4.5. The shutter is very hard to arm and the slow times are very erratic. Shutter and diaphragm are clean.

    So I...
  5. Replies
    57
    Views
    4,301

    Re: Cheap 4X5 Cameras are Everywhere

    I'm glad I do not seem to be the only one thinking this is not a cheap camera but a very, very expensive sunshade....
  6. Replies
    99
    Views
    4,384

    Re: What equipment is hard for you to find?

    - a scanner that sits between a flatbed and a drum that could take to 8x10
    - centerfilters for wide angles
  7. Replies
    30
    Views
    1,897

    Re: can't get sharp photos with an LF camera

    Could be I'm running into the limits of the scanner. But I don't think so. I'll get the light table out end of April (not at home the next week and weekends). As for large aperture... when used at...
  8. Replies
    30
    Views
    1,897

    Re: can't get sharp photos with an LF camera

    Yes, I always try to be between f/16 and f/27. Maybe a bit arbitrary but on the other hand I'm mostly at a fair distance of the subject.


    To me it all seems just as "not quite sharp".


    It was...
  9. Replies
    30
    Views
    1,897

    Re: can't get sharp photos with an LF camera

    Ok, thanks for your input guys. So I need to do some tests the coming days. I won't be able to develop the results for a week or so but I'll come back with what I found.
  10. Replies
    30
    Views
    1,897

    Re: can't get sharp photos with an LF camera

    Well, I only took apart the GG of the Wista 45D as it was in need of a clean. And what I found was:
    - lens
    - fresnel with the ridges to the side of the lens
    - metal spacer
    - GG with the ground...
  11. Replies
    30
    Views
    1,897

    can't get sharp photos with an LF camera

    when I compare my photos with what I find here and elsewhere on the net, they never look as sharp. Sometimes I do get a sharp one. But I cannot attribute that to a lens of film. It isn't movement,...
  12. Replies
    192
    Views
    22,149

    Re: How Many LF Formats Do You Use/Own?

    Still at least 5475 days to go. That is if they don't change the rules and I make it. Honestly, I'm not counting on either of that. Taking photos when I can using the camera I feel that moment. Going...
  13. Replies
    192
    Views
    22,149

    Re: How Many LF Formats Do You Use/Own?

    4 x 5: Wista 45N, 45D and a pinhole camera
    3-1/4 x 4-1/4: National Photocolor 3T44
    6.5 x 9 : Devin Tricolor (but that's MF I guess)

    I do have some 5x7 holders around but no camera to put them in...
  14. Replies
    12
    Views
    819

    Re: A ULF from a cardboard box?

    Problem is that ULF film is more expensive than the cameras and lenses...
  15. Replies
    57
    Views
    4,301

    Re: Cheap 4X5 Cameras are Everywhere

    If you don't absolutely want the "big names" because "they are soo much better" you can get set up for a reasonable cost. But if you want to pay for a brand name on your gear, go ahead.
  16. Replies
    12
    Views
    814

    Re: Curtis Color Scout

    Great job! I'm interested in those dichroic splitters. That must be a great step up from beamsplitters and color filters.

    National Photocolour can stll provide new beamsplitters for their cameras....
  17. Replies
    6,893
    Views
    1,794,433

    Re: MF (6x4.5,6x6,6x7,6x9,6x12) B&W film images sharing

    They are holiday homes in De Haan (Belgium).
  18. Replies
    6,893
    Views
    1,794,433

    Re: MF (6x4.5,6x6,6x7,6x9,6x12) B&W film images sharing

    One with the Mamiya Press 65mm. I repaired the light leak around the button to release the lens and also replaced the seals of the back.

    https://quirinus.one/forum_foto/6x9_018.jpg

    Foma 200, 10...
  19. Re: Trouble releasing front element retaining ring of 178mm Kodak Ektar - images incl

    I have taken out 2 sheared brass bolts (M1.6 JIS) by drilling very carefully in them with a 0.5mm drill in a hand holder. Takes some time but when I was through (about 3mm deep) I inderted a square...
  20. Replies
    7
    Views
    739

    Re: making shutter blades?

    Well, I got some 0.1mm stainless steel shim. At the moment the idea is to etch them using the old (rusted) blades as a mask.
  21. Re: Ilex No. 4 Acme Synchro Shutter - Troubleshooting

    My pleasure, I'm happy it served someone. Here it is: https://www.largeformatphotography.info/forum/showthread.php?162077-taking-apart-and-cleaning-an-Ilex-4-ACME-shutter&highlight=ilex+acme

    Keep...
  22. Re: Ilex No. 4 Acme Synchro Shutter - Troubleshooting

    If I compare that to what I found in my Ilex 4 Acme, then that spring sits differently:

    http://quirinus.one/forum_foto/3t44/ilex/ilex_4_acme_006.jpg

    The rest if taking it apart is also on the...
  23. Re: DIY ULF Lenses - 3D printing resin, epoxy casting or sand casting?

    Would making it yourself be an option? No idea if you can buy an optical blank. But I once found in the library at uni a book about lab practices and grinding your own lenses and mirrors was part of...
  24. Re: DIY ULF Lenses - 3D printing resin, epoxy casting or sand casting?

    "Liquid optics"? Nothing new, Herschel used it in one of his telescopes. 2 halves filled with liquid in between. Different liquids give different indexes. But you can go large without needing massive...
  25. Re: How many film holders do you bring for a day out?

    Just 2 questions about this:
    - do you store the film holders with the darkslides in? I sometimes think it might be better for the velvet that the dark slide is out. But I never seen/read this so...
  26. Re: What issues are there with this Aero Ektar lens - and how can I repair them?

    #3 says fungus to me. Might be the photo and how it is taken. The black things are likely paint flakes.
  27. Re: Ilex shutter #5 bent shutter blade, are all #5 identical?

    If it is as the #4 ACME I took apart, then you just need to "wiggle" the next piece out of the black "cup". It is just very tight fitted together.

    New parts shouldn't that hard for an Ilex....
  28. Re: How many film holders do you bring for a day out?

    Using a Jobo 2520 + 2509n I never messed up developping unless I poured in the wrong solution or messed up the dilution. And with rotation I can develop 6 of them with 270ml. Try to find a lot of 4x5...
  29. Re: How many film holders do you bring for a day out?

    Do you mean ten keepers or just ten shots?
  30. Re: How many film holders do you bring for a day out?

    Ah is it? Sorry, when I read measurements without units I assume SI.
  31. Re: How many film holders do you bring for a day out?

    I looked at those and they all come from the US or further away. Let's take a look at just the first on the list:
    - 100 sheets 10x12 (approx 4x5) €39.61
    - postage €45.63
    - taxes and duties, 30% on...
  32. Replies
    7
    Views
    739

    Re: making shutter blades?

    It might be easier to find another shutter in the US but here in the EU it isn't that easy. And getting one mostly involve getting a complete lens. I do have a good set of lens elements. So it looks...
  33. Replies
    7
    Views
    739

    making shutter blades?

    Right, I'm trying to get a synchro-compur #00 back to work. This was a bad buy on a fair. Lens was clear and neat, shutter locked (nothing rare) and low priced. Ok, so the shutter had been wet, rust...
  34. Replies
    29
    Views
    2,677

    Re: Lens element sources and specs?

    I haven't followed this from the beginning or read all the related threads. But when you have formulas that describe a design, you can use them in several ways.

    Mostly this seems to be interpreted...
  35. Re: How many film holders do you bring for a day out?

    Like many others I work in multiples of 6 sheets. So mostly 6 holders. All the same film or 2 types.

    I do tend to buy boxes of 25 sheets and then load the complete box in holders, mark the holder...
  36. Replies
    23
    Views
    1,636

    Re: How not to drill a lens board

    +1! You really need a mill with a flycutter or a lathe.
    .
    .
    .
    .
    .
    .
    .
    Or far more patience than I have.
  37. Replies
    24
    Views
    2,578

    Re: Bolts in an Envelope

    This works until you meet a JIS thread. Which is metric in diameter and pitch but not in thread form. I haven't found a source for small JIS bolts so far.
  38. Replies
    24
    Views
    2,578

    Re: Bolts in an Envelope

    They very likely sell you a new camera because they have no idea, let alone tools and pieces to repair a camera that is older than they are.
  39. Replies
    59
    Views
    4,794

    Re: Expired Certificate Error

    Same here. According to firefox (on linux) I have to update my clock of the pc. I don't think that NTP works that way :D At least Firefox let me continue, Vivaldi (my default browser) or the Android...
  40. Re: Question about Lenses and focal lengths... in German

    "freier Öffnung" is the "free opening", that which is free to pass light. So apperture is correct I'd say.

    "verhält" in this case is as in a mathematical "ratio/proportion of 2 to 3".
Results 1 to 40 of 903
Page 1 of 23 1 2 3 4