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    Re: Importance of back movements

    There is always distortion in photography. A man once showed Picasso a photograph of his wife to show what she looked like. Picasso replied, "Oh, is she that small and flat?"

    Like most...
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    Re: Importance of back movements

    True if you want keystone distortion for aesthetic reasons. But one can justify any method of doing anything for "aesthetic reasons", no matter how technically wrong it might be.

    Keystoning is...
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    Re: Importance of back movements

    Any back movements will cause keystoning, a big no-no in serious architectural documentation. Front and rear standards should always be plumb. Just use rise/fall to center the building as needed.
    ...
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    Re: Importance of back movements

    ...and then use front rise to center the frame on the building. No other movements are necessary.
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    Re: Importance of back movements

    Hence a bit of rise/fall/shift to get the lens' optical axis back on center, (if your camera has those movements.)
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    Re: Importance of back movements

    Movements for depth-of-field, i.e., the "Scheimpflug Effect", only work when you have one part of the frame at one distance and another part of the frame at another distance, and you tilt/shift to...
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    Re: Rodenstock 300mm Imagon on 8x10?

    The "Imagon Look" comes from using the h/stop disks with the little apertures open. I always likes using it with the conventional aperture, or wide open. The newer version in the modern Copal...
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    Re: Index Tabs to your film holders

    I just put a post-it note on the dark slide of each newly-loaded holder with the film type written on it. Pertinent information, (date, lens, intended development time) are added when shooting. The...
  9. Re: Will I Get Vignetting: Toyo 810G - 1200mm Bellows - Xenar 480mm f/4.5

    If the bellows sags at long extensions, that could block the light path. Just tuck the dark cloth or something else under the bellows at its midpoint to prevent the sagging. Other than that, the...
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    Re: Protar Lenses.

    The original Zeiss Anastigmat was renamed the Protar VII, because everyone who corrected their lenses for astigmatism called them anastigmats, and Zeiss wanted a name they could protect. That was...
  11. Re: How much dimmer on the ground glass is an f/9 lens vs a f/5.6? Or f/5.6 vs f/4.5?

    If you can find access to someone's view camera (since you don't have one yet), just set the lens at different apertures and compare focusing and brightness.
  12. Re: Does changing aperture move the focus point

    Quite right! Each different aperture disk allows light from different parts of the lens. As the Imagon has lots of spherical aberration (it is a soft focus lens, after all), the focus shift is...
  13. Re: Does changing aperture move the focus point

    Berenice was quite right in post #5.

    I'll add that focus shift is the result of spherical aberration, which is also the driving force behind the soft focus effect. The outer area of the lens is...
  14. Re: Wollensak Velostigmat Series II 12" inch f4.5 diaphragm shape

    Looks like an old Studio Shutter. Yes, their blades do get sticky and out-of-alignment.
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    Re: Common Large Format Mistakes

    Probably the most common large format mistake is getting into large format in the first place...

    :rolleyes:
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    Re: Velostigmat Series II; Info and Images

    If you find 9mm to be a bit too much softness for a particular image, you can tone it down with a smaller aperture, say, f/5.6 to f/8, just like with all soft lenses.
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    Re: Velostigmat Series II; Info and Images

    On my 12-inch in a Betax shutter, about 9mm, which gives quite a bit of softness. Other barrels and focal lengths may vary, but every one I've tried can give a pretty soft image when unscrewed near...
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    Re: Yellow, Orange, Red Filter Factors?

    Use a grey card in daylight, not colored subjects in whatever light source is around the house. Also, meters wander. Paul is right, trust the manufacturers.
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    Re: Weekend Mystery Quiz

    Some people focus from the front, some focus from the rear, so it would make sense have both, one on each side.
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    Re: 8x10 carry options

    I believe it was Edward Weston who observed, "There is nothing worth peeing on more than 200 yards from the car." Or something like that...
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    Re: 8x10 carry options

    Must be a "your mileage may vary" thing. In my younger days, I hiked a mile plus a number of times, and found it a Godsend.
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    Re: 8x10 carry options

    I'd say just hunt for an f/64 backpack, made for the job by people who know about these things...
  23. Re: Which would be easier to build - 8x10 SLR or TLR?

    I'd go with an SLR. On an 8x10 TLR, there would be about a foot of distance between the viewing and taking lens, way too much of a difference for both composition and focusing.

    A really trick...
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    Re: Where to Work - At Home, Kids, etc

    I'd also avoid working around a gas water heater, or anything else with a pilot light.

    I'd consider putting up black-out curtains around a dark corner if the basement, if there is one. But you...
  25. Re: STILL LIFE - Lens Thoughts & Recommendations

    You might also consider your enlarger lens, as you already own it.

    Weston used a 210mm Tessar on his 8x10 for his peppers, shells, and other close-up still-lifes. The old ones similar to his...
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    Re: Wet Plate portrait lens

    The Verito is a very fine sort focus lens, but is very soft wide open, (f/4). For a subtle smoothing of skin textures, you'd be working around f/8, which you may find slow for wet plate.
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    Re: Artifact identification

    My guess is that your collodion was just a bit thin and your pour-and-drain too fast, and most of your collodion drained off from those two edges. Note that you drained to the opposite corner, as...
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    Re: Wet Plate portrait lens

    Flattery of "women of a certain age", without resorting to a fairly soft lens, is better done with softer lighting. Petzvals are very sharp in the center, among the sharpest. The reasons for going...
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    Re: Brass Emil Busch 10" F8 Rapid Aplanat!

    Eight times the diameter of the aperture, which is probably the same as eight times the diameter of the front element, presuming nothing in the barrel is restricting the aperture.
  30. Thread: Eidoscope

    by Mark Sawyer
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    Re: Eidoscope

    Lesson number one in soft focus lenses: stopping them down reduces the soft effect, a little more so at far distances where the depth of field id deeper. By f/8, the Eidoscope is losing most of its...
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    Re: 300mm lens 4x5" landscape

    Because the OP started his question with:



    I agree that an f/9 lens is workable for most people in daylight situations, but it seems many of the responses ignore the first qualifier on the...
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    Re: 300mm lens 4x5" landscape

    What does your teleconverter do to your viewable light?
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    Re: 300mm lens 4x5" landscape

    F/6.3 Tessars, like the Commercial Ektar, tend to come in larger, older shutters.

    The f/5.6 Fujinon-L and Nikkor W come in a Copal 3, which isn't too large.

    An f/6.8 Dagor would be a good...
  34. Re: Focal Lengths with movements for Tachihara 4x5

    Too bad, I'd have thought the bag bellows would be an option on any modern 4x5. Still, a recessed lensboard will help.
  35. Re: Focal Lengths with movements for Tachihara 4x5

    If you go with a bag bellows and/or recessed lensboard, you can use an even shorter focal length with movements. If you use a telephoto lens, you can use a longer lens than the standard bellows will...
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    Re: Still Life, 2021

    On this forum, I think we're all developing our own patinas...
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    Re: Velostigmat Series II; Info and Images

    Thank you, gentlemen! :)
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    Re: Some Soft Focus Lens Sales Information

    In other large Petzval eBay action, a Ross No. 5, went for $6,300. (eBay item number:184748608832)

    Back in the soft focus realm, a Cooke PS 945 went for $5,202, (+$125 s&h). A rare phenomenon,...
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    Re: Velostigmat Series II; Info and Images

    Bump, because I finally got around to replacing all the old Photobucket links that they smeared their giant logo all over. Now uploaded and hosted by Flickr. Wonder how long they'll last...

    I...
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    Re: Portrait Lens 8x10, soft focus

    Considering what you already have, I'd say the Eidoscope or Verito. The Verito is the best buy at going rates, because it was so popular there are a lot of them still around. And there's a very...
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