Berndt
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Post by Berndt on Aug 7, 2012 5:31:57 GMT -5
Thanks everybody for the comments again. It took me a few days, taking everything in consideration and ... last but not least, it's so damn hot here, that I can'tuse my computer for more than a few minutes a day Yes ... but ... how can I explain it properly ? If using a magnifier, it is already correcting/adjusting everything with the distance. Not understandable, isn't it I mean, we try to put the magnifier into a position, where we can see a sharp picture and even if the lens is out of focus, you will get a sharp picture somehow. Still not a good explanation ... However, I thought about a solution and remembered a very interesting magnifier, which came with one of my large format cameras ( picture attached ). It has a cylinder and therefore the distance to the object is fixed ( of course, you could change it, but you shouldn't ). What I found out is, that I might have been right. Some former owner must have exchanged viewing and taking lens for what reason ever. It should work now ... hopefully
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mickeyobe
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Post by mickeyobe on Aug 7, 2012 5:51:36 GMT -5
berndt,
Perhaps I misunderstand you.
The magnifier will be - should be - magnifying the ground glass image. Once in position, that is its distance from the ground glass, it will not have to be moved. That distance will always remain the same. The magnifier will in no way affect the focus of the camera. It will only show you when the camera is properly focused. It is exactly the same as the pop up magnifier attached to the camera's hood only more powerful.
".....even if the lens is out of focus, you will get a sharp picture somehow..... Not so, berndt. All it is doing is magnifying a fuzzy image and that is what you will see.
Stay cool.
Mickey
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Berndt
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Post by Berndt on Aug 7, 2012 6:19:48 GMT -5
Thanks, Mickey ... and it sounds logical, what you are saying.
My mistake might just have been, not having/using a proper ground glass. I mostly used matt tape, which is not as plain and stable as glass. But basically you are right. Thanks for reminding me on that !!!
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mickeyobe
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Post by mickeyobe on Aug 8, 2012 14:30:02 GMT -5
Thanks, Mickey ... and it sounds logical, what you are saying. My mistake might just have been, not having/using a proper ground glass. I mostly used matt tape, which is not as plain and stable as glass. But basically you are right. Thanks for reminding me on that !!! berndt, I cannot find a reasonable (CHEAP) source for ground glass. I have found if I use a colourless, translucent, flat sided, large (4L) plastic bottle such as vinegar comes in I can cut out fairly large, reasonably flat pieces from its front and back to use as a substitute GG. One side is usually rougher than the other. That side goes toward the lens. Mickey
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daveh
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Post by daveh on Aug 9, 2012 18:15:40 GMT -5
I cannot find a reasonable (CHEAP) source for ground glass. Mickey Do it yourself: www.dokasphotos.com/techniques/ground_glass/I haven't read the article, but I would imagine the grit used for grinding in car valves would work - coarse paste initially, then going finer.
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mickeyobe
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Post by mickeyobe on Aug 9, 2012 19:03:32 GMT -5
Thank you Dave,
It is an interesting article but has scared me away from DIY ground glass.
I did have some glass sand blasted for me once. It was cheap but much too coarse.
I have also found it is difficult to get glass that is thin enough for the relatively small 6x6 and 6x9 cameras.
My next step is to try a piece of non reflecting glass from a picture framer. I haven't got to it yet. Being retired I am much too busy to be doing everything I should do. Some day soon.
Mickey
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