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  1. Re: What is the difference between Goerz Artar, Celor & Dogmar?

    Dan, had a feeling some smartarse might point that out :)

    Fair enough it doesn't look like a standard tessar in cross section but the classic f/6.3 version sold in the early 20th century was still...
  2. Re: What is the difference between Goerz Artar, Celor & Dogmar?

    The same reason that Zeiss made f/6.3 Tessars, f/4.5 Tessars, f/3.5 Tessars, f/2.7 Tessars, Apo-Tessars, Tele-Tessars, e.t.c. All superficially the same design but there's a lot of adjustment...
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    Re: Making a camera look better.

    Don't assume that having them powder coated professionally will necessarily be really expensive. There have been small-scale powder coating firms all over the place in most countries I've visited (on...
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    Re: Buying a Commercial Ektar

    While we're nitpicking, technically the Tessar evolved from the Unar which evolved from the original Zeiss Anastigmat. The Cooke Triplet came after the Zeiss Anastigmat and had its own independent...
  5. Re: Lens at around 600mm - 840mm with image circle of 52inch

    The angle of sharp coverage you'll get with a single element will be poor unless it's stopped down a lot (likely to the point where diffraction will negate the resolution advantages of such a large...
  6. Re: Lens at around 600mm - 840mm with image circle of 52inch

    1200mm is a normal focal length for 32x40 and even a process lens that long is a stretch to cover at infinity. a 35" dialyte would put you in close-up only territory. Unless you want 2/3 of your...
  7. Re: How to replace 8x10 Sinar glass without breaking it?

    My Norma certainly never had anything like this. I would personally just bend the metal clip back a little bit if I felt it was applying too much pressure. all that matters is that the glass is help...
  8. Re: How to replace 8x10 Sinar glass without breaking it?

    The glass goes between the entire metal clip and the camera back, not between the 3 prongs of the clip. The clip is just there to apply some pressure so the glass stays pressed against the ridge of...
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    Re: Tt&h cooke convertible lens questions

    From the 1912 Cooke Brochure

    "The Series III., IV. and V. Extension lenses are designed to
    replace the back glass of the normal Cooke lenses, and the Series II.
    and 11 A. are designed to replace...
  10. Re: Sinar P Question. Which 8x10 Standard Bearer is more sturdy?

    Well.. That is certainly not the 8x10 Heavy Duty that I use.

    Never seen a bearer like that. I can see omitting the other gears to save weight or cost but it seems strange to do it for sturdiness.
  11. Re: Sinar P Question. Which 8x10 Standard Bearer is more sturdy?

    I'll make a note to take a photo but my DSLRs and large format equipment are in separate studios, neither of which are anywhere near where I am at the moment.

    Honestly, just get whatever version...
  12. Re: Sinar P Question. Which 8x10 Standard Bearer is more sturdy?

    Didn't realise there were two versions of the 8x10 rear standard bearer. I have 4 of the 8x10, heavy duty standard bearers (which can be identified by the "boxed-in" shift wheel and longer rise...
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    Re: Spacing between meniscus and iris

    A good starting point would be putting the stop 1/5 of the focal length ahead of the meniscus, concave side towards the subject as Struan says. In ideal circumstances that would give you 20-30...
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    Re: Achromatic doublets, coverage and resolution

    I wrote this reply before reading your second post.

    Now that I have, let me be clearer.

    Without knowing exactly what doublet you're talking about, no-one will be able to answer your question...
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    Re: Achromatic doublets, coverage and resolution

    Afraid I can't answer your question directly either, but a few things to think about..

    Firstly, if you're thinking along the lines of getting a 1000mm lens to use for 4x5, as Dan says, there are...
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    Re: The value of Rare lenses

    There are rare lenses that sell for big money because they're niche without a lot of readily-available equivalents (very fast lenses, very long lenses, ultra wide-angle lenses) and there are those...
  17. Re: How to disassembly old brass Tessar 400mm f4.5

    Need to get another bottle of Kroil. Ran out a while back and no-one sells it over here anymore.
  18. Re: disassembling Zeiss (or Docter Optic) 750 f9 Apo-Germinar barrel lens?

    I have a vague memory that mine came apart fairly easily. As Dan says though, you'll likely be looking at a custom machining job into a #5 shutter. I believe SK Grimes have done this successfully...
  19. Re: How to disassembly old brass Tessar 400mm f4.5

    Not saying it can't be done, but I have tried to unscrew the front group of a big tessar in the same design of barrel before using a pipe clamp and a steel threaded rod. the steel rod bent, the front...
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    Re: Interesting Find: An Old Story

    Thanks for the link Bill.
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    Re: Mounting lens without the original flange~

    For those in the UK, I'll happily put in a recommendation for SRB-Griturn - http://www.srb-griturn.com/

    They've done a couple of VERY large custom flanges for me on barrel lenses. Be sure to send...
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    Re: Your thoughts on the Sinar F

    The F is a budget / entry level system and it shows. If you need a monorail that's as light as possible than that might be a justification for picking up an F (or ideally F2 as has been mentioned)...
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    Re: f2.7 16.5cm (165mm) Tessar

    I have one.

    4x5 coverage is a push. If you'll accept severe corner mush / vignetting / spherical aberration or work with close subjects you could be fine with it.

    I personally like the...
  24. Re: Lenses "in barrel" - how do you typically use these?

    How do I use them?

    Sinar P 8x10 front standard (with second standard bearer as front support)
    10"x10" Solid Aluminium Lensboards
    7" Opening behind the lens Packard Synchro Shutter

    My bigger,...
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    Re: 35inch Redbdot artar

    Seems high to me also. 35" Artars aren't that rare. I let my (non red dot) 35" go for around 500 a couple of years ago. My pristine 47 1/2" Red Dot Artar bought a year ago on Ebay was around the 1K...
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    Re: Lenses covering 20 x 24

    I was going to mention this about Aplanats / RRs. Not only is the meniscus shape of the groups important, but I believe it was originally a design where both glasses are flints, with the negative...
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    Re: Lenses covering 20 x 24

    I've been on the lookout at SS for a long time but have never found a decent-sized negative achromat suitably weak to extend the focal length of a lens in the 600mm range.

    Given the...
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    Re: Lenses covering 20 x 24

    a GOOD negative diopter would have to be achromatic to avoid introducing a lot of fringing and aberrations. In my experience, it's very hard to find decent, coated, negative achromats in large...
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    Re: Protar Madness?

    I had an old protar given to me once. It was nothing remarkable. I'm not a fan of wide-angles so the coverage didn't mean much to me, plus the viewing image was very dim. Eventually I gave up on it...
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    Re: Sinar Norma Extension Rail

    I don't think I've ever owned a standard rail. All my rails (14 of them) are extension rails. Can't say it's hindered me.
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    Re: Why do you not see longer FL lens in L/F?

    Firstly, pricey is a relative label. My Sinar P setup with custom made bellows, all 8x10 standards and a 1500mm f/8 or 1200mm f/9, cost less than a Cacon 5dIII and 85mm f/1.2.

    Secondly, you seem...
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    Re: Why do you not see longer FL lens in L/F?

    Yep, the Dallmeyer is a Dallon Tele-Anastigmat. Made for 8x10". Can actually cover 16x20" adequately in my experience. Bellows draw for infinity is around 900mm which is within the reach of many 8x10...
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    Re: Why do you not see longer FL lens in L/F?

    Price and lens weight aren't key reasons IMO. People are buying the latest, hefty Canon lenses for those sorts of figures.

    There are just few practical uses for lenses that long when you can't...
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    Re: Chrome Sinar P

    Colour aside, I believe the P2s came with metering backs while the Ps had standard, non-metering backs. The P2s had rubberised knobs & handles and a couple of other control tweaks.

    Like Ken, my...
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    Re: Chrome Sinar P

    By Chrome, do you mean silver coloured?
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    Re: Space Between Lenses

    My input as a humble photographer who has had cause to try and re-assemble a couple of lenses in the past is that it is not a simple matter of rough adjusting and then fine-tuning.

    As has been...
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    Re: 8x10 APO lenses, f-number < 4.5

    Probably because it is impractical to make a lens apochromatic over a range of reproduction ratios, and because there are very few cases where lenses actually need to be strictly apochromatic. For...
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    Re: 8x10 Monorail for Portraits?

    I haven't.

    I have the saving grace of shooting in a studio on a flat floor. My Sinar setup actually "floats" on steel roller stands most of the time so adding an extra rail clamp is a piece of...
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    Re: 8x10 Monorail for Portraits?

    Is there a monorail system that allows you to assemble 2-3m rails that are 100% rigid though? Sinar even sold 36" (or maybe 40", i forget) one-piece rails for use in scientific and defence...
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    Re: 8x10 Monorail for Portraits?

    Not quite sure what you mean by this. Were you unhappy with the rigidity of the rail itself, or the rail clamp not taking the weight, or not being able to re-position the camera?

    As for the last...
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