![]() The extension arm is so massive that alignment is undisturbed. The construction of the LED bulbs needs to be taken into account and the orientation of the fitting may have to be switched though 90 degrees in typical Durst configurations - easy enough.Put the M and the CLS 35 together and they spell good color prints. The colour temperature changes the effects of Multigrade filtration - lower temparatures are softerģ. ![]() LED bulbs can be used in black and white enlargersĢ. I believe both these results to be a function of the lower colour temperature - 2700k rather than 4000k and suits the Durst light path better than the 4000k unit.ġ. Secondly, the contrast is reduced by approximately one grade. Firstly the exposures are almost a full stop slower which is interesting as the bulb is rated 30% more powerful than the other lamp. ![]() The 13 Watt 2700k bulb changes the behaviour of the enlarger in the following way. I tried out out a 13.5 watt LED bulb of 2700k colour temperature to see if that provides a source that delivers a wider spread of contrast. The box sits against the back of the enlarger head and points the bulb directly at the mirror. I made a carrier out of an Edison fitting attached to a box made from black foam mounting board that flips the bulb though 90 degrees. The collar raises the light source within the bulb and provides an uneven light. To fit the LED bulb and to make it provide an even light source it has to oriented horizontally so that the deflecting mirror sees only the bulb and not the collar of the bulb. It works fine although it delivers more contrast than I want - grade 1 filters provide enough contrast for average negatives but therefore a narrow spread of grades. ![]() ![]() My Durst M805 (condenser) has currently a 10.5 watt LED of 4000k colour temperature. The new LED lamp provides perfect coverage and even light, immediate fire up and consistent exposures time after time. I have replaced the incandescent bulb in a Leitz Valoy 11 with a 6 watt 4000k bulb that works perfectly, this machine is now future proof. Incandescant bulbs for enlargers are becoming scarce and increasingly expensive and so I thought a conversion to LED bulbs could be viable and therefore provide a long term solution. I thought this topic may be of wider interest and so have created a new post. This was originally a reply to another post earlier today. ![]()
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March 2023
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