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> Raising the column |
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#11
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Oh yes I do colour. |
#12
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HI John, i was thinking more about print quality and your remark that lenses other than your APO Rodagon are inferior. In my case using the APO lens gives me no quality benefit over the normal lens. As you print colour you experience may be different.
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#13
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APO Rodagon
Bill, my findings yesterday showed something I had not noticed before that showed how the APO lenses appear to work. I had not noticed it before when using it with colour.
With B&W and the condenser enlarger and a Peak focus finder as I focussed in on the edge of an object in the photograph just before the exact focus point, there was a pale green fringe, which when the focussing became spot on, this green fringe disappeared. Going past the point of focus, the green fringe was replaced with a pale red/pink fringe. Go back again to the perfect focus point and the fringe disappeared. Using a non apo Meopta Meogon 2.8/50mm lens, the fringes did not disappear. It made no difference in sharpness with a B&W print, possibly because paper is essentially 'blind' to green and red. |
#14
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I have done a little research into enlarging lenses and published it on the blog here is the link if you are interested:
Enlarging lens
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Mitch http://photomi7ch.blogspot.com/ If you eliminate the impossible whatever remains no matter how improbable must be the truth. |
#15
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Many years ago I built a rudimentary vacuum paper holder for Gerry Dickens' lab out of a 2" x 1" timber frame and a thin plywood top and bottom. There was a post in the middle to stop the top and bottom being sucked together. A hole was cut with a hole saw in the short side of the frame to fit the rigid part of a vacuum-cleaner hose and the top, painted white, was drilled in a grid to suit the paper sizes used. Holes outside the size of the paper were to be blocked with waste paper and masking tape. I never saw it in action but I hears that they made various alterations over time, mainly to adjust its position with respect to the enlarger.
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#16
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#17
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Enlarging lenses
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On the Nikon 50/2.8 I have owned both the early all metal one and the later part-plastic version. To be honest I found the all metal early one to be significantly better and wished I had never sold it - until I bought the APO Rodagon. |
#18
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Raised enlarger column
I have been quietly working away with a solution and eventually decided upon physically raising the column from the baseboard, but still using the base clamp. I acquired a block of seasoned English Oak about 7" cubed and drilled the bottom to take 6 x 5" long wood screws to fasten it to the baseboard.
The metal clamp base on the column was drilled and screwed to the new raised base block and the enlarger re-assembled. A quick test showed that I can now print almost to 20x16 from 35mm and over that with a 645 negative even using my 80mm Rodagon. My biggest worry was ensuring that I managed to get the block of wood really square and the surfaces parallel, but I got around that with a favour from a local carpenter friend who also polished the wood smooth. So there you have it, an easy solution. |
#19
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Nice to hear that you have a solution. Simple can often be the best but these days I bet a block of 7" cubed seasoned oak is not that easy to obtain, nor are local carpenters who will help out.
Mike |
#20
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Oak
Ahhh! It could be down to who I know. The oak was an offcut from a bannister newel post that the carpenter (a friend) was assembling in a Victorian house where he was doing the woodwork replacement. It cost me a couple of bottles of good wine though. Cheap at twice the price.
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