While I understand why you'd want to see if using those lenses would work, you do realize that using simple wide-angle and tele-converter adapters would be your better bet, don't you?Stacking that much glass in front of an already existing camera lens will degrade the image greatly. Every glass-to-air surface robs an image by as much as 5% contrast and light levels.It's a novel idea, to use old SLR lenses for this, but really .... ... you need to be using simpler lenses in front of your camera's lens. I have an old 55mm that I use with a reverse coupler for extreme macro-photography, but I wouldn't even think of mounting any of my old zoom and other macro lenses out in front of my normal Powershot lens.Do a test of TRUE resolution comparing the images that you can get with tele-extenders and normal single-element or single-element achromat close-up lenses, compared to the way you are doing it now. I bet you are getting at least 1/2 the resolution that you can get by using simpler methods with less glass.That's a fun experiment with stacking glass, but I don't think you thought this through completely.
Ground glass? What are you doing? Trying to focus on the image from the SLR lens that's focused on ground glass?
just hold the camera upside down
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