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> Raising the column |
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#1
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Raising the column
I am going to start using my 2nd enlarger which is an Opemus Standard. for B&W as I have found it is markedly better than the LPL 7700. It has a condenser instead of a diffusion light box which gives better contrast and shorter exposure times. Also the negative carrier is fitted with a single anti Newton ring glass in the upper half.
The problem is it will only enlarge up to just over 10x12 with the standard column length and a 50mm lens. I can make a wall bracket to raise the height so that I can get to a little bit more enlargement greater than 12x16. Is there a formula that I can use to calculate how high the base of the will have be. |
#2
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I can't help with a formula for the height, but when I got mt Opemus 6, must have been 20 years ago, I got the standard model, and like you found the coloum height limiting, but in a junk shop I found a damaged and non working Opemus (Can't remember which model, but it was older than the 6), the focus controls were siezed up, and it was for sale for £1, but it had the de luxe colum, which was the same height as the de luxe model, so I changed over the coloms, they were the same fitting, and so had the extra height I wanted, still using the same enlarger to this day and the prints from the condenser head are stunning
Richard
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jerseyinblackandwhite.blogspot.com |
#3
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Another way to get larger prints is to get a wide angle enlarger lens, saves a bit of stretching too when focusing.
Tony |
#4
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Enlarger column
Quote:
I have not used the Meopta for a while and was surprised that the lamphouse does not get very hot - not as much as the LPL. So I dispensed with the upper Newton ring lass in the negative holder and focussed on the baseboard and left it for 10 mins with the lamp switched on and the focus was still absolutely perfect. Last edited by John King; 24th December 2019 at 09:12 PM. |
#5
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Just tried it on my enlarger: 50mm lens and a 35mm negative mask in the carrier.
16" wide at the easel, height from easel to negative = 26" 20" wide at the easel, height from easel to negative = 31.5" The formula is H = fl * (2 + 1/M + M ) where H is the distance from the print to the negative, fl is the focal length of the lens and M is the magnification factor. So, calculating for the 16" measured above: 35mm film (longest side = 36mm) , M for a print 16" (406.4mm) on the longest side = 406.4 / 36 = M = 11.29 From the formula: H = 50 * (2 +1/11.29 + 11.29) H = 668.9mm = 26.3" which is close enuff given the usual approximations and measurement inaccuracy etc. Last edited by Bob; 24th December 2019 at 10:53 PM. |
#6
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Thanks Bob.
I have measured the height of the column and I will have to raise it by 7" to enable me to get a 16x12 print with a 1" margin on the long side. This also includes the fact I will be dispensing with the baseboard and focussing onto the masking frame on the table. |
#7
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Can you turn the head on it's side to project horizontally for bigger enlargements?
Mike |
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Quote:
Perhaps if you do colour, which I don’t, there may be a difference with colour fringing but for what I do, monochrome, there is no difference. Bill |
#9
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Enlarger column
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No, what I am going to do is to fix a raised section onto the baseboard made up from 5 or 6 pieces of 3/4" marine ply about 5x4 inches in area glued together and screw this to the base board from underneath, then bolt the base plate directly onto this. That will give me the height I need to go up to make a print about 14" wide x 21 long more than enough for what I need. The wall mounting idea isn't a good one either because the enlarger has a sloping column, will not allow me to stabilise the column at the top. It needs stabilising because of the weight of the head will almost certainly make it unsteady. The way I propose to do it now will not have that problem. |
#10
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Horizontal projection was practical enough for St Ansel and even Clyde Butcher.
I have tried it, and it worked fine for me too. I used small magnets to hold the paper flat onto a metal masking frame. However, another option is to turn the column 180deg around and project onto the floor, making sure to counterbalance the baseboard. Mike |
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