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  1. Re: Calculating f-stop progression . . .how are the numbers derived?

    surely the area of a circle is all that's needed
  2. Re: Calculating f-stop progression . . .how are the numbers derived?

    That's right. Each full stop step halves (going up from 1.0 to 1.4, 1.4 to 2.0, ...) the amount of light the film receives given subject illumination and shutter speed.
  3. Re: Is it a linear progression between 90mm and 150mm?

    I pointed you at one, you !@#$%.
  4. Re: Is it a linear progression between 90mm and 150mm?

    Learn to do the calculations.

    But since ..., On 4x5 a 90 mm lens covers 80 degrees. A 150 covers 53 degrees. The average is 66.5 degrees. A 114 mm lens, as was fitted to some relatively high...
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    Re: Forum Growth.....or not?

    Nor do I. Photography in general and LF in particular remind me of the hobbies my cohort had before we passed puberty. We collected things: coins, stamps, insects, ... We did things: ham radio,...
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    Re: Forum Growth.....or not?

    Sorry, you come across as lonely and bored.
  7. Re: Brexit trade (custom) treaty - and Global Shipping Program (for EU trades)

    Another reason to use the post instead of courier services. At least in the US. There's no fee for customs clearance of incoming parcels here.
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    Re: Forum Growth.....or not?

    Grow, not necessarily, but we need recruitment >= departures to stay alive.
  9. Re: Brexit trade (custom) treaty - and Global Shipping Program (for EU trades)

    Not only on imports. On everything taxable (what's taxable is state specific) purchased by residents.

    I believe that countries in the EU treat all purchases -- from inside and outside the EU --...
  10. Re: Cambo Super - pack down and pack options?

    Sorry, no, the Cambo doesn't fold up. And then there's the rail ...
  11. Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    Bernice, learn to read. The link you posted is headed
  12. Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    Learn to read. He explicitly mentions TTH and says too that Angenieux used the TTH's idea to develop many more lenses. And he says nothing about Wide Angle Rectilinears or early w/a anastigmats...
  13. Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    Another myth. TTH introduced this type of lens in 1931 for the 3 strip Technicolor process. Lenses occasionally surface on, e.g., ebay.com.
  14. Re: Cambo Super - pack down and pack options?

    Remove the bellows, rotate the standards 90 degrees so the rail and they are coplanar and the camera will fit in a briefcase or suitcase.
  15. Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    You're not wrangling about the physics and I didn't blame the quote on you. I blamed Rodenstock's marketers.
  16. Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    I meant specific lenses. 35/4.5, 45/4.5, 53/4.5 and 75/4.5 Biogons for, respectively, 6x6, 6x7, 6x9 and 4x5.

    Your R'stock quote is marketing fluff. I just looked at the "relative light fall of...
  17. Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    You're probably thinking of f/4.5 Biogons. One, the 75/4.5, covers 4x5. Big heavy expensive lens.
  18. Re: Nikkor-T 360mm / 500mm / 720m: 500mm at full aperture with 4x5 film, how good?

    Yes and yes. The lens' back focus is ~ 85 mm. I mean, it is a telephoto lens.
  19. Re: Nikkor-T 360mm / 500mm / 720m: 500mm at full aperture with 4x5 film, how good?

    Bernice, my 12"/4 TTH telephoto, ex-AGI F.139, doesn't quite agree with you. I've never tried it on 4x5, which the VM says it just covers. It seems to be the longest lens that works comfortably on...
  20. Re: A source of valuable data on French lens makers and their products.

    Steven, re the quality of the information in Le Reve Edition's pamphlets, I bought their Berthiot pamphlet before starting serious work on my Berthiot LF anastigmats article. Their account of...
  21. Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    If you shot a 135 on 4x5 you absolutely positively shouldn't need a CF. The corners will be down 3/4 stop from the center, or the center up 3/4 stop from the corners.
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    Re: Which are the fancy lenses??

    Adam, if you are still using a Cambo SC -- I've completely lost track of what you have -- a bag bellows will cost less that the 115 of your dreams.
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    Re: Fitting Graphic-Kowa 210mm F9 in Copal 1

    Still not guaranteed.
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    Re: Fitting Graphic-Kowa 210mm F9 in Copal 1

    Any? Not guaranteed.
  25. Re: A source of valuable data on French lens makers and their products.

    Jim, Ron, see post #22 above. The seller has changed its mind or lied from the start.
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    Re: Which are the fancy lenses??

    Bokum? Hokum.
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    Re: Which are the fancy lenses??

    Adam, you're still overthinking nearly everything.

    For most of us, the first camera was the wrong camera. Using the first camera taught us what the replacement had to do.

    For most of us,...
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    Re: Which are the fancy lenses??

    I think you're mistaken. There were two versions of the Hypergon. 140 degree lens with fan (mechanical center filter!) and a later 110 degree lens without fan. The use of the same trade name for...
  29. Re: A source of valuable data on French lens makers and their products.

    complet means sold out. Remember, the publisher claims that the print run -- 100 -- was chosen to ensure that the pamphlets would be valuable collectors' pieces.
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    Re: Which are the fancy lenses??

    Fancy schmancy. Adam, you overthink everything. This site has resources that you can use to help yourself. To get to the FAQs, click of the LF Home Page button at the top of the screen.
    ...
  31. Re: 360mm Gerogon Enlarging lense? Opinions Please

    Hmm. The Apo-Gerogon is an f/9 w/a process lens for small process cameras. Its recommended operating range is 1:5 to 1:1. The Componon-S Drew suggested is half a stop faster.
  32. Re: Voigtlander Apo-Skopar w/ aperture ring AND waterhouse stops??

    All this is perfectly normal for process lenses such as the Apo Skopar. Waterhouse stops with circular holes act as stops, as does the diaphragm. Those with square or diamond shaped holes shape...
  33. Re: Anyone ever try to make a franken-camera

    I have a tandem Graphic. Rear camera is a 2x3 Pacemaker Speed Graphic, front camera is a Century Graphic, the coupler is a 2x3 film pack adapter with round tube attached to a 2x3 Pacemaker Graphic...
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    Re: Question: Can this be done?

    John, you'll need to mount the 5x7 back on a tapered extension.

    I don't think you should bother. If you want a 5x7 Graflex ante up and buy one.

    I make this suggestion because of a disastrous...
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    Re: Show off your ULF camera

    State and local sales and use taxes, you ignorant fool.
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    Re: Ilex Acme 3 shutter?

    Jim, I'd like to agree with you, Acme-speak notwithstanding, but the shutter's indicated high speed is 1/200. Self-cocking Ilex shutters' top speed is 1/100.

    We may be looking at a self-cocking...
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    Re: Ilex Acme 3 shutter?

    OP, in Ilex parlance Acme means "cock and shoot" and Universal means "self-cocking."
  38. Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    Bob, for center filters see my article http://www.galerie-photo.com/center-filters-for-large-format-lenses.html, which recommends CFs from (in alphabetical order) Heliopan, Rodenstock and Schneider...
  39. Re: Best 75mm / 90mm lens?......totally kidding, but not really...read on pls

    As you said, your question is silly. For your purposes, 75s from the big four (in alphabetical order, Fuji, Nikon, Rodenstock and Schneider) are functionally equivalent. Same goes for 90s. There...
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    Re: Ilex Acme 3 shutter?

    https://skgrimes.com/products/shutters/ilex-shutters/
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