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  1. #11
    Eyepix's Avatar
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    No worries, no ruffled feathers here. Thanks for your input guys. I guess the frames overlapping were due to my not understanding or getting used to advancing the film enough. I also got a little frustrated with it. I guess I like sure things. I myself can't find myself to part with my 4x5 gear. It is too sure a thing for me, I am very comfortable with it. Marco I checked out your panos and I really liked some of them. Very very nice. I especially liked the composition on the San Fran Bay photo. Makes me want to go out and buy another panoramic camera. You were using a 72mm on those? The widest I have is a 90mm. Do you think that a 90mm is too mild a wide angle lens to fully use the dimensions of the 6x17 format?

  2. #12
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    The four "Bay" pictures were taken with the Technorama and a 90mm.

    Common wisdom is that a 72mm or a 75mm are too wide for a 6x17 and a 90mm is more balanced.

    My project had to do with using the 6x17 as a glorified point-and-shoot in challenging lighting conditions (metropolitan areas at night). I reasoned that the 72mm SA XL - with its huge circle of coverage - could be used wide open and deliver images that one can enlarge 8x-10x and still be on the safe side quality-wise. Looking at the MTFs it seemed possible to cover 6x17 at f/5.6. This is not the standard way of using LF lenses (I mean wide open), but rules are made to be broken, right?

    The two pictures below were taken at f/11 and f/5.6 with the center filter on. Please disregard the fact that they are really ugly, it was just a test :-) and that the resizing has shifted a bit one vs the other. Both taken hand-held.

    f/11


    f/5.6


    The fall-off is noticeable at f/5.6 but I think the image is still usable. What is for me more important is that the resolution at f/5.6 is quite good when compared to that at f/11. Not just in the center (that's to be expected) but in the corners as well (I used a 10x lupe).

    The shutter ghost images are instead a cause of concern, because if you look at the shadows the sun was way way off, and I did take great care of staying away from it. Since I used the 72mm XL for several years with no such problems and only a few times with the center filter on, my educated guess is that the latter has something to do with the problem. But it's just a guess.

    If you already have a 72mm XL - like I did - is one story. If you do not, I think it's an overkill to use such a lens on a 6x17, unless you really need to shoot at f/5.6. It's expensive, it's bulky, filters are 95mm (I use the Lee filter system on it because once you have the filters for other lenses that's the cheapest solution, it requires only a special adapter). And even if you have such needs I would consider the 80mm SS XL instead which is much smaller. Performance-wise is probably a wash: it's a bit faster than the 72mm SA XL, the circle of coverage is a bit smaller, resolution wide open a bit worse, but these are all measurements, I'm pretty sure that a print looks just as nice. And that 10% shorter focal length of the 72mm XL is not dramatically altering the perspective.

    For "normal" use I guess the 90mm is a better choice. Just my two cents.

    Cheers!
    Last edited by mammolo; 04-22-2008 at 05:40 AM. Click to view previous post history.

  3. #13
    Eyepix's Avatar
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    I was looking at badger graphics and I noticed there wasn't a lens cone for the fotoman? The Gaoersi 617 uses several lens cones for different sized lenses. How does this work on the fotoman? Does it come with a universal cone that adapts to several lens sizes?

    Do you have to calibrate the lens? I'm asking because I'm wondering if its necessary to buy the Ground Glass.

  4. #14
    Ian Grant's Avatar
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    There can't be a universal cone due to the large differences in lens to film distance.

    The Gaoersi cones are factory set for a specific lens, ie 90mm SA f8 or f8 Grandagon etc, in the past you had to calibrate them yourself. I have a ground-glass but never use it at all, the focussing mounts are accurate.

    Ian

  5. #15
    Eyepix's Avatar
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    Quote Originally Posted by Ian Grant View Post
    There can't be a universal cone due to the large differences in lens to film distance.

    The Gaoersi cones are factory set for a specific lens, ie 90mm SA f8 or f8 Grandagon etc, in the past you had to calibrate them yourself. I have a ground-glass but never use it at all, the focussing mounts are accurate.

    Ian
    So you're saying that all I need on the fotoman is the focusing mount? There is no lens cone?

  6. #16
    Ian Grant's Avatar
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    Quote Originally Posted by Eyepix View Post
    So you're saying that all I need on the fotoman is the focusing mount? There is no lens cone?
    No just the opposite !!!!

    You need a lens cone to fit each lens. The lens cone includes the focus mount.

    Ian

  7. #17
    Eyepix's Avatar
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    Ok.Thats what I would have thought. The problem is the only U.S. seller of this camera (badgergraphic.com) sells all the parts to the Fotoman but not the lens cone. They don't give you the option to choose the proper lens cone for the appropriate lens. ??? I'll look again, maybe I'm missing something.

  8. #18

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    Fotoman offers the most extensive selection of Lens Cones of any panoramic camera... by far. This allows for the use of almost any lens from 72-400mm on 617, provided the lens has a #0 or #1 shutter. On our website (http://www.fotomancamera.com), go to the product page for the camera you are contemplating. Under the camera description will be a compatibility table, listing all of the lenses we have a Cone Assembly for. For example, our 617 camera currently lists over 70 lenses that can be used... even more for our 612.

  9. #19

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    Quote Originally Posted by HeinrichVoelkel View Post
    Hello,

    for an upcoming project I want to shoot panoramic images...but I cant decide on the format...


    Is there any comparison of the various panoramic formats on the web...with different lenses...and please let it better be visual...as numbers, like angle of coverage dont really help me...

    Google didn't bring much up so far.....

    Thanks in advance,

    Heinrich
    There is a very useful, easy and simple way to know. Make yourself a frame in the format you want to have (or more frames) and look through it at whatever you like to take picture of. The distance of the frame from your eye is the focal length you will need for the given composition. That's all. You can have as many "visual tests" as you like - no need to look at someone's else pictures.

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