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  1. Replies
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    Re: 360mm Tele Lens for 4x5 Tachihara

    There is a Voigtlaender (a.k.a. Voigtlander) Telomar 360mm f/5.5 available on eBay right now for $1500. They probably often sell for a little less than that. I find the Telomar great on color film...
  2. Re: Location of hinge line for tilted lens plane

    Doug, you forgot the message in the first paragraph of the thread:



    That's a perfectly clear. Personally, I am very interested in this topic.
  3. Re: Apo Grandagon 35 Question & Seek Opinion

    The APO Grandagon 35mm?---I love it. I shoot it almost always with a Horseman 612 film holder. In my opinion, it covers this format (56mm x 112mm) fine, but I use a Contax...
  4. Re: Portrait perspective: Quiz and two questions

    I will try to be brief.

    No, I do not know exactly what I am going to do about LF portraits.

    Ansel Adams's book is not a book on mathematics, yet he has lots equations. Some of the...
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    Re: Center of perspective and nodal point

    I would love to see them!
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    Re: Horizontal tripod extension

    Leonard,

    That's easy---get a large Benbo tripod. Perfect for the task. It is very tall, has a long side arm in the basic design that can extend in any direction. It weights about 8 pounds. If...
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    Re: Center of perspective and nodal point

    Terrific discussion, but suppose I am not at the moment interested in panoramic stitching. Instead, I have a perspective I like in 4x5 with m = 1/3 that implies a focal length of 300 mm. If I want...
  8. Re: What do you photograph with your 150mm lens?

    More depth of field with 150mm over 210mm yes, if shooting at infinity. Otherwise, you will not see more depth of field with a 150mm lens if you keep image magnification and f/stop the same---at...
  9. Re: What do you photograph with your 150mm lens?

    Obviously, head-and-shoulders portraits on an Olympus Pen 35mm half-frame camera. Perfect perspective! :)
  10. Re: Portrait perspective: Quiz and two questions

    Frank,

    In Applied Photographic Optics (third edition, 2002), Sidney Ray gives a way to compute the taking focal length of a photograph, if you know the following:

    enlargement magnification;
    ...
  11. Re: Portrait Perspective: Response -- Part 2

    Gregory,

    You bring up several issues.

    You, and several others, wonder, Does any 35mm-portrait photographer really think that a 300mm focal length can be clearly superior to 85mm? I never...
  12. Re: Portrait Perspective: Response -- Part 1

    Gregory,

    You wrote, "I don't mean to be disrespectful, but after reading your original post, some of which I found confusing, and all the responses to it, especially your attached paper, it's...
  13. Re: Portrait perspective: Quiz and two questions

    In Ray, third edition, p. 123, I found this: "The centre of the entrance pupil is the centre of perspective of the lens." I had missed it because it is in the index under "center" instead of...
  14. Re: Portrait perspective: Quiz and two questions

    Can anyone make an intelligent guess as to how well Ansel Adams would do on my quiz?
  15. Re: Portrait perspective: Quiz and two questions

    Great! Can I come to Rio Rancho too? I already finished my answer to the test---it appears in post 42 as well as the thread with the super-exciting title "Computing seven lens variables from three...
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    Re: What's Going On Here?

    Why any limit at all? What would go wrong with 50? 10 seems not enough and a pointless limitation.
  17. Re: Portrait perspective: Quiz and two questions

    Helen, yours is definitely the first to make this point. Thanks. Do you remember any reference to this idea of rotating the camera about the entrance pupil and that being the location that...
  18. Re: Portrait perspective: Quiz and two questions

    Nice of you to ask. I took pictures three nights so far this week. I am thrilled with my pictures from Monday. I am going to scan some of them---my first 6x24 scanning.



    You misunderstood me...
  19. Re: Portrait perspective: Quiz and two questions

    Hi Paul,

    The percentages you quote are relevant to perspective, but they are largely irrelevant to depth of field. To a first order of approximation, depth of field is determined by aperture...
  20. Re: Computing seven lens variables from three inputs

    Actually, I agree with your thought that it is bad to mix units.

    Are you referring to the two examples on the last page? If so, I was only trying to make clear that if you have numbers in two...
  21. Re: Portrait perspective: Quiz and two questions

    Like Mae West said, well,



    I can't resist asking, Frank or anyone else who understands, could you devote a paragraph or two explaining this point for me? The almost-cheating point, not the...
  22. Re: Portrait perspective: Quiz and two questions

    Interesting example. I used to teach music at the University of Nebraska. Anyone who cannot do any of the technical stuff would flunk the first year. The best musicians I know have a solid...
  23. Re: Portrait perspective: Quiz and two questions

    In terms of the variables in my initial post and also my paper (attached), Part 1 is u, part 2 is not relevant, and part 3 is z. I guess the chin from the top of the head in the subject is a...
  24. Re: Portrait perspective: Quiz and two questions

    Phong, (or anyone else who can contribute) for me this brings up three questions:


    What is this you are saying about requiring a lot more skill from the photographer? Are you saying that a...
  25. Computing seven lens variables from three inputs

    In a previous thread, "Portrait perspective: Quiz and two questions" I offered a quiz. The attached pdf contains my answers.

    This is how the pdf starts:
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    Re: Oh no, I've blacklisted myself!

    To anyone who thinks this is logical, I dare you to permanently delete your "Sent Email" folders, because you obviously already know what you wrote. You also know who you wrote it to, when you wrote...
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    Oh no, I've blacklisted myself!

    I have my account set up for emails sent to me of all posts, and I do get all posts, except for...mine. Somehow, I have blacklisted myself. At the risk of losing some admiration for my apparent...
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    Re: Any feeback on the new Fotoman yet?

    I was at the foot of Adler Planetarium tonight, shooting across Lake Michigan after sunset at the Chicago skyline. I consider the perfect 120-film camera there maybe to be a 6x36 with about 18mm of...
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    Re: Any feeback on the new Fotoman yet?

    Funny, I have two of the original Fotoman focusing mounts, and I might be willing to part with one. I suspect there are or will be others out there willing to sell the original mounts---probably...
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    Re: Any feeback on the new Fotoman yet?

    I am so curious to know the advantage of the handles that far forward! Does it increase stability, perhaps?---leading to less camera shake?

    Also, where the cable release go? Does it attach to...
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    Re: Any feeback on the new Fotoman yet?

    Is it a Xenotar 150mm f/2.8? If it is, I might have a solution for you...a way to put that lens on a Fotoman 4x5. It depends on whether Fotoman can still make 4x5 spacers that accept their old...
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    Re: Any feeback on the new Fotoman yet?

    I have the Fotoman 624. Just calibrated focus on my 110mm and 180mm spacers. If everything goes well, I will get some images back in a few days. It actually fits in the Kinesis belt system...
  33. Re: Portrait perspective: Quiz and two questions

    I see which post you mean now, and I see what you mean now, thanks! You are saying the exact answer to my question #1 is "object distance to the rear principal point". Thanks so much for being...
  34. Re: Portrait perspective: Quiz and two questions

    Jim, do you recall some details of how you shot these? Any movements? Do you recall the taking apertures approximately?
  35. Re: Portrait perspective: Quiz and two questions

    Yes, you came the closest to answering my original boldfaced question in your post (post #7). If you view this topic in threaded mode, then you will see that I already responded to your post. This...
  36. Re: Portrait perspective: Quiz and two questions

    Sorry, vijayn, I believe yours is a common mistake, and since you expressed yourself so clearly, it is easiest to address it here. You were right in all respects except one. Let me first try to...
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    Re: Gaoersi 4x5

    My Gaoersi 4x5 can use these lenses:


    55 mm allowing 25 mm of shift (modified by Ken Ruth)
    80 mm allowing 25 mm of shift (factory)
    150 mm, but no shift (factory)
    240 mm
    360 mm Telomar...
  38. Re: Portrait perspective: Quiz and two questions

    Frank,

    Thanks for responding! (And that goes for everyone, even those, unlike Frank, who insist that my questions are stupid and could not possibly benefit anyone.)



    Hmm..., how would you go...
  39. Re: Portrait perspective: Quiz and two questions

    Jim, would you be willing to please expound on this a little as to format, focal length, and magnification?
  40. Re: Portrait perspective: Quiz and two questions

    Henry and David,

    One quick question. Did you two give an answer to my question #1? Is it u, u+v, or something else? That is, are you two asserting that perspective is determined by the subject...
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