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  1. Replies
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    Re: New here and looking for lens advice

    Also consider a loupe with a soft base that won't scratch up the Fresnel screen.
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    Re: Wet Plate Collodion questions answered here.

    Besides getting soft, old collodion also gets very thin with age, pouring almost like water. Let it set up on the plate a while or it will be too thin after being drained off. Better to just order...
  3. Re: Which first Rear Movement and Asymmetrical Tilt Chamonix 45F2

    Below is the type of Chamonix 4x5 I'm familiar with. As you can see, the pivot point is aligned with the bottom of the rear standard frame, not the bottom of the ground glass area. Yours may be...
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    Re: Petzval lens questions

    It may be too thick, as modern felt tends to be much thicker than the old stuff. But worth a try!
  5. Re: Which first Rear Movement and Asymmetrical Tilt Chamonix 45F2

    On the Chamonix, the axis (hinge location) is below the frame. That's where it tilts from, so of course any tilt moves everything off the focal plane. The bottom of the frame near the hinges moves...
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    Re: Petzval lens questions

    For question 1: Many Petzvals had a felt lining inside the brass barrel that the inner barrel slid against. When that's removed, the inner barrel is loose and slides around easily. Remove the drive...
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    Re: Agitation and highlight density

    Not really. We agitate to move new developer in as the old developer exhausts. With stand development (no agitation), the denser areas of the negatives (the highlights) exhaust the developer...
  8. Re: Which first Rear Movement and Asymmetrical Tilt Chamonix 45F2

    Respectfully, experience says secondary focusing always has to be done, regardless of the tilt system.
  9. Re: Which first Rear Movement and Asymmetrical Tilt Chamonix 45F2

    As the Chamonix 45F2 has its tilts hinged at the bottom, focus there first as that area of the focal plane will remain relatively unchanged. Then tilt for the foreground focus. As previously...
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    Re: Blowing and agitating whites

    If you're often photographing in situations where the highlights blow out, look into stand developing, also referred to as compensating developing.
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    Re: A very rare lens!

    I think Boris has had a little too much of that Austrian beer...
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    Re: New here and looking for lens advice

    To echo Luis-F-S, a reliable shutter is as important as the lens, and barring some sort of abuse, it would be difficult to tell much quality differences between modern (post-WWII) lenses.
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    Re: Voigtlander Heliar Universal Lens vs ?

    The Velostigmat Series II came in 12, 14, 14.5, 15, 15.5, 16, and 19-inch versions. Just for your search parameters.

    Here's a thread on removing that retention screw:
    ...
  14. Re: About Joe Cornish and the scope of the Large Format Photography Forum

    For all the furor over formats being "banned", I can't see anything that's been banned, just moved to a more appropriate part of the forum.

    The high-end cell phone cameras now have pixel counts...
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    Re: Rapid View Portrait (RVP) Pictorial lens

    Many makers advertised the convertibility of their Petzvals, using only the front element as an achromatic landscape lens. The Jamin/Darlot Cone Centralisateur was specifically designed for easy...
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    Re: Cooke Portrait Lens Serial Numbers

    Thank you! I'll have to sit down for an hour or two to go through this.

    A big loss indeed. I wonder if Cooke maintained the data internally, and could give access somewhere.
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    Re: Cooke Portrait Lens Serial Numbers

    Does anyone know of a source outlining the differences between the different generations of the Cooke Portrait Lenses?

    There is an excellent page describing the differences between the various...
  18. Re: Which 360mm lens has the largest image circle

    If you reverse-mounted a 180-degree fish-eye lens, would it cover everything?
  19. Re: Which 360mm lens has the largest image circle

    The largest Globe lens was the 16-inch, rated by Harrison & Schnitzer at 19x23. (The historic Mammoth Plate size is 18x22.) According to Dan Colucci, 4 or 5 are known to still exist.
  20. Re: Which 360mm lens has the largest image circle

    A 200mm Goerz Hypergon covers 24x28. Good luck finding or affording one.
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    Re: "Rack and Pinion" focus on LF lens?

    Turning it should move the lens barrel forward and backward in the outer housing. Besides the fine focusing Jim mentioned, such focusing was popular for stereo cameras so you could focus one lens to...
  22. Re: Astragon 360mm f/4.5: What do I have here?

    It's a big, fast Japanese-made Tessar. Few modern/coated Tessars were made of that size and speed, as they were too large to fit into any modern shutter, but Schneider made a few modern coated Xenar...
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    Re: What is this lens ?

    Check the actual focal length to see if it's a telephoto or not. As Ridax suggested, a telephoto lens will cover much less, and most of the longer aerial lenses were telephotos.
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    Re: contact printing ??

    The negative goes on top of the paper?
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    Re: Dissassembly of an Antique Brass Lens

    Keep us informed, and good luck...
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    Re: Rodenstock Imagon

    Thank you! Yeah, the black eye is a bit worrisome, but that's what happens when little girls put on make-up! On the original print, you can see a little Kuhn-bug where the ring sparkles. I hate...
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    Re: Dissassembly of an Antique Brass Lens

    Regarding any "clamp-it-and-force-it" methods, the only way I'd try that is with adjustable rubberr-strap oil filter wrenches that wrap around the whole body of the lens.

    With a flange, you might...
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    Re: Rodenstock Imagon

    For comparison, here's one from my 300mm Imagon wide open, no disk.

    https://live.staticflickr.com/65535/51159589017_da6b8f9751.jpg
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    Re: Rodenstock Imagon

    This is as soft as my 360mm Imagon gets with the h/5.8 disk (holes open).

    https://live.staticflickr.com/65535/52341341776_93e5241c2f_c.jpg
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    Re: Dissassembly of an Antique Brass Lens

    That's what I use. It's still a petroleum-based penetrating oil, but with some "enhancements" like naphtha, so use it outside.
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    Re: Rodenstock Imagon

    Or get some properly-sized lens caps and drill out your own to the effect you desire. I always found the f/5.8 disk with the holes open is still too sharp for Pictorial work.
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    Re: Dissassembly of an Antique Brass Lens

    I'd run some penetrating oil into the threads and let it sit a few hours.
  33. Re: Photography is a Top Driver in Silver Demand, Showing Film’s Resurgence

    Silver nitrate is still cheap, under $1/gram when buying 1/2 pound or more.
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    Re: Do you get sentimental about your lenses?

    Sometimes I put them on the camera and take advantage of them... Does that count?
  35. Re: Aperture question - Scheimpflug - Portraits / Portraiture

    The Scheimpflug Principle presumes a two-dimensional subject. In the three-dimensional world, with things projecting off the flat plane of sharp focus, those watching the Photographer's frustration...
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    Re: a tin type processing question

    Without seeing it, I'd guess it wasn't varnished. That can happen at events where there's a hurry to get the tintypes to the customers. Sorry, no fix I know of.
  37. Re: "Cooke Lens Compendium" is finally published

    The Compendium just starts with "The first Cooke lens was made from an elegantly simple design, patented in 1893, known as 'The Cooke Triplet Patent'.” It's worth noting that Taylor, Taylor & Hobson...
  38. Re: Silvery Shine Schneider Center Filter III

    I suspect an unusual AR coating, but yes, Bob S. might now better.
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    Re: Portraits from 2022

    Edison, what a wonderful image.
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    Re: Help to ID this lens.

    Could also be a plasmat with one positive element missing. You'd have to disassemble it to see. The shutter alone is probably worth more than the shutter with the lens.
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