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> Query regarding Durst m670 bw. |
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#11
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If my ignorance is showing here ,please excuse me , but i am unfamilair with the concept of a light mixing box, i am not sure if one would be necessary on this setup (?) and if so , one has not been supplied . Appologies for the wordiness of this response but i am struggling to enunciate the concepts involved in describing something that i was hoping to be far more straightforward and simple ! I will enclose photos of the VC head to see if that is of help . |
#12
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Wonderful Jev,
The VC head needs the light mixing box, 35mm and 66/67, respectively. Simply, the BW head is a condenser enlarger type and uses the glass condensers to focus the image on to the baseboard via the pearl photolux bulb. And diffusion type enlargers use the halogen light source BUT require light mixing boxes in order to illuminate the baseboard evenly. I'll see if I can find some pic's for your enlarger and failing that one of my own. Naturally, this explains the gradation in filters and extremely short exposure times.
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MartyNL “Reaching a creative state of mind thru positive action is considered preferable to waiting for inspiration.” - Minor White, 1950 |
#13
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Here's a pic of one of my own set-ups, condenser vs diffusion.
__________________
MartyNL “Reaching a creative state of mind thru positive action is considered preferable to waiting for inspiration.” - Minor White, 1950 |
#14
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Thanks again Marty, that clears it up very well . Monday morning will involve a short sharp email to the retailer ! (sadly a sponsor of this forum !!!) Every day in the darkroom is a learning day .
Last edited by JevCar; 18th April 2021 at 09:04 AM. |
#15
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In order to begin to print up to 6x7cm format, with both the BW condenser type and VC diffusion type heads, it appears you will need at least the following parts; Siriocon 80, Vegabox 35, Vegabox 667
Needless to say, all glass and perspex surfaces need to be mark-free. Images courtesy of the net. Best of luck!
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MartyNL “Reaching a creative state of mind thru positive action is considered preferable to waiting for inspiration.” - Minor White, 1950 |
#16
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JevCar, just curiosity on my part since the whole enlarger is totally different to my Durst M605. All I can see in the photos is one dial that seems to be calibrated in grades 0-5 just as MG filters are but I see no separate dials for Y,M and C as you get with a colour head
If there is only one dial and presumably one know to control that dial then how does this work? Does one knob move both filters and somehow alters the amount of Y and M depending on the grade you dial and presumably works in the same way as the colour head dual filtration method listed in Ilford's VC paper instructions? Thanks Mike |
#17
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#18
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Thanks Jevcar. I had no idea that such a filter arrangement existed. If I have understood things correctly, this is not a colour head at all but is, as I speculated, an attempt to simulate the kind of dual filtration that you get given by Ilford when using the separate dials of Y and M on the 3 dial colour heads
I now understand why there is the kind of mixing of colours as you use the numbered dial It will be interesting to see whether this dial when merging M with Y keeps the correct exposure over grades 0-5. Unless it is able to do something which I cannot think of, then I imagine that some kind of compensation in exposure will be needed by the user Mike |
#19
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One would hope that there is parity between 0 to 5 on the dial an 0 to 5 in filter grades , we shall see . I get the mixing box tomorrow and have a couple of negs that I need to print with contrast so that will be a good opportunity to find out .
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#20
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Thanks Jevcar. It will be interesting to find out the mechanism controlled by the filter dial ensures that the right lever of Y and M are inputted at each grade to get the exposure correct.
I have no doubt that it gets the grade correct but correcting the exposure over the whole range of 0-5 I think may not be possible. However to be fair the MG Ilford under-or-over-the lens filters require one change beyond G 3.5(namely double exposure ) with the former Ilford MGIV paper but the latest paper that people refer to as MGV require much less correction. So it may be that now many years later your system of one simply dial may now have achieved or has at least got close to achieving what with former papers was not really possible Mike |
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