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Thread: Loupe focussing issue

  1. #11

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    Re: Loupe focussing issue

    Quote Originally Posted by Doremus Scudder View Post

    FWIW, I've been drooling over this Silvestri loupe for some time now... http://www.silvestricamera.com/ita/c...ng.asp?ID=5050

    Best,

    Doremus
    Oh my goodness, now that I have seen this, the appeal is heightened by the possibility of actually seeing the corners of my 65mm lens on my 4x5 cameras to a degree that will allow focusing check, among other things. Seeing something so obviously well thought out and with some original thinking in the design, makes one wonder just what will some people around the world think of next that we don't know we will lust after.

    Thanks for that link.

    Mick.

  2. #12
    Jac@stafford.net's Avatar
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    Re: Loupe focussing issue

    Quote Originally Posted by Mick Fagan View Post
    Oh my goodness, now that I have seen this, the appeal is heightened by the possibility of actually seeing the corners of my 65mm lens on my 4x5 cameras to a degree that will allow focusing check, among other things. Seeing something so obviously well thought out and with some original thinking in the design, makes one wonder just what will some people around the world think of next that we don't know we will lust after.
    Please excuse my skepticism: it was born into me. The angle view of the Silvestri loupe is a gimmick. If you understand your lens, and you should, then focusing within the 50% central area should suffice. You know the rest of the focus area.

  3. #13

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    Re: Loupe focussing issue

    Quote Originally Posted by Jac@stafford.net View Post
    Please excuse my skepticism: it was born into me. The angle view of the Silvestri loupe is a gimmick. If you understand your lens, and you should, then focusing within the 50% central area should suffice. You know the rest of the focus area.
    Your scepticism is noted, and yes, you are correct

    However with a centre filter on and photographing an engine bay in an automobile, there is a very fine line between acceptable focus, which happens around 2 stops down, and very good focus which more or less, really gets underway around 2 stops down. But, as the camera is sometimes not at 90 to the engine, due mainly to a non removable bonnet getting in the way; compromise is the order of the day.

    I currently use a linen counter loupe, as I can hold it loosely above the GG at any angle to ascertain if in fact, I have acceptable, close to acceptable, or, borderline acceptable on the corner that must be in very good focus.

    As strange as it may sound, and shortly after purchasing my 65mm lens for 4x5" I have been photographing some of the engine bays of a private collection of interesting automobiles. Something I never in my wildest dreams I thought I would be doing. I am using a column stand with an extending arm that is capable of holding 10kg of camera 1.4m from the column. This was built expressly for this job by the in-house mechanic after I initially declined the invitation to photograph the engine bays, as I didn't have a suitable camera mount. Using sand bags, the 10Kg limit can easily be exceeded; bit of a once in a life time job.

    I picked this exercise up when the owner of the collection saw me photographing our car with my camera about 45cm off the ground, and about 40cm away from one of the front corners of the car. He looked at what I was getting on the GG; the rest is history, as they say.

    That said, I do not ever see me picking up one of those loupes. I would love to have one, it isn't going to happen, but one can lust after one, can't one?

    Mick.

  4. #14

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    Re: Loupe focussing issue

    Quote Originally Posted by Jac@stafford.net View Post
    Please excuse my skepticism: it was born into me. The angle view of the Silvestri loupe is a gimmick. If you understand your lens, and you should, then focusing within the 50% central area should suffice. You know the rest of the focus area.
    Jac,

    I don't know about the Silvestri loupe, but changing the angle of view of the loupe for viewing the corners of the ground glass, especially with shorter lenses and when using extreme movements, is a real help. As mentioned, I use smaller 8x loupes and use them inverted, that is, with the skirt toward my eye. This allows me to view at any angle to the gg. I find I have to hold the loupe significantly off of perpendicular for many situations in order to find the bright spot for best focusing. If the Silvestri loupe can do this with the base resting on the gg, then it should be a great tool. For many of my shots, there are near objects at the edge of the image that I really need to focus on; using just the center 50% is a no-go.

    Best,

    Doremus

  5. #15

    Join Date
    Mar 1999
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    769

    Re: Loupe focussing issue

    I use the Silvestri loupe - it works as advertised. Another reason I find it useful is that I often have things in the edges and corner that are visually important but require DOF to keep in focus and I prefer viewing under a loupe over using a formula (or in addition to...). In general, I have come to appreciate the use of triangulation - anything important is worth figuring out in 2-3 different ways to check if all methods point in more or less the same direction. Viewing the corners with the lens stopped down can be hard and the Silvestri does handle that well. It is also small and light and well made. Cheers, DJ

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