[pure-silver] Re: Durst L1200 (condensor) & uneven illumination
- From: hksvk <hksvk@xxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 23 Jul 2007 11:56:53 -0400
Try exposing a sheet of film the size of the filter drawer. Develop it to
the proper density (probably will take several if not many trials, then
place it in the the filter drawer. You might obtain even density
edge-to-edge and corner-to-corner this way. I am about to embark on this
very strategy with my Beseler 45MCRX. Good luck. ---Harry.
>
> Hi,
>
> I have been using a Durst L1200 Laborator with a condensor for about 15
> years now (35 mm upto 4*5 inch). I have always been quite happy with
> this enlarger. In the past I have checked the illumination and noticed
> it was a bit off.
>
> Recently I looked in more detail: I used the correct condensors and lens
> (80mm), focused a 6*6 negative , removed the negative, and used a RH
> Zonemaster II in the density mode to check the illumination on the base
> board.
>
> I now noticed that the corners and the side were quite off. The L1200
> has on the side 2 knobs for the lamp postion, and the lamp housing can
> be moved in and out as wll.
>
> The best I could do is roughly the following:
>
> 0.15 0.08 0.16
> 0.08 0.00 0.07
> 0.17 0.06 0.12
>
> (so the middle put on zero, the other figures representing the very
> corners and sides). Initially I mistrust the Zonmaster, I mean 0.1 means
> 1/3 stop and 0.15 1/2 a stop.
>
> I find this alot, OTOH I never realy noticed this when printing
> (probably tells that I am not that a good printer I guess..
>
> So I checked by exposing a grade 5 piece of paper to about middle grey,
> and sure enough it showed the same effect, (although I am not sure if I
> realy see that half a stop difference) the corners beeing somewhat
> lighter.
>
> Somehow I find this dissapointing for such a sturdy enlarge of great
> reputation, you might say why worry if you're happy with prints, but it
> is nagging..
>
> So I tried to diffuse the light between the bulb (a guinine Phillips
> Photocresenta, 75 watt) and the condensor with some milky plastic,
> paper, and even a piece of groundglass. It did not help, and even made
> matters worse.
>
> Another solution would be a diffusion head, a CLS501.
> I happen to own such a head, but I was not too happy with it for various
> reasons.
>
> So any suggestions on improving matters will be greatly appreciated!
>
> Best,
>
> Cor
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