LPL 6700 enlarger query

[Terry S]

Speaking of Durst's, I've always wondered what the small green(?) grid screens on the front of many of them, actually do?

Can anyone put me out of my misery?

Terry S

[alexmuir]

Originally Posted by Terry S

Speaking of Durst's, I've always wondered what the small green(?) grid screens on the front of many of them, actually do?

Can anyone put me out of my misery?

Terry S

You use it when the enlarger is converted into a copy camera. You take the mirror out and reverse it. You can then view the baseboard via the green screen to align the artwork. You would have fitted lights to illuminate the baseboard, and a sheet film cassette, or roll film holder goes where the carrier normally sits. I have all the bits, but have never actually tried it. There are easier ways to make copies, although the lights are still useful. They clamp on to the edge of the baseboard.
Alex


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[Bob]

B&W paper is not sensitive to IR - it's not even sensitive to R.

Enlarger and projection lamps are always dichroic so the heat is not projected forward (as much). There are optics in the light path you do not want to overheat and negative/film you do not want to melt.

Cheers, Bob.

[Keith Haithwa]

Originally Posted by Bob

B&W paper is not sensitive to IR - it's not even sensitive to R.....

Cheers, Bob.

I am aware that paper is insensitive to red Bob but somewhere in this age-addled brain of mine lurks a dim memory of issues with paper and excessive IR, fogging perhaps? - but it's probably just file corruption.

Unfortunately there is still the issue with 'silvered (aluminised)' as against 'dichroic' reflectors in these tungsten halogen lamps and printing with the LPL C6700/7700 enlargers. As you noted, there is the problem with heat but the issue my friend and I had was that no matter what we tried we couldn't get a half decent print, or predictable grade changes with MG paper, until we changed the lamp to a branded dichroic lamp when the issue immediately went away - and yes, I did try a new, locally bought, so-called projector lamp as a control test. Incidentally, even after a 5 minute lamp-on period neither the mixing chamber or negative stage got overly warm.

Anyway, I'm more than happy with my enlarger now and if anything in this thread helps others then it has served it's purpose hasn't it.

[Terry S]

Originally Posted by alexmuir

You use it when the enlarger is converted into a copy camera. You take the mirror out and reverse it. You can then view the baseboard via the green screen to align the artwork. You would have fitted lights to illuminate the baseboard, and a sheet film cassette, or roll film holder goes where the carrier normally sits. I have all the bits, but have never actually tried it. There are easier ways to make copies, although the lights are still useful. They clamp on to the edge of the baseboard.
Alex

Thanks Alex. You have cleared up my wonder over many years what the green screen was for, and it's not something I would have thought of.

Terry S

[Quendil]

Thanks for all your help. I am going to take the head to bits and clean it all up to get the colour filters working again. I'll get a new bulb once I have done that.

[DNierga]

Did you solve de problem?
I recently bought a VC6700 and I'm having a similar problem.
I've been using the lever on the bright position, because in the other one at f8 I have to expose for minutes.
I don't know the what bulb is in it, if its the original or the previous owner changed it.
Anyway, the grades colours tweaking just seems to work fine but the output light is too dim in my opinion.
Thats the most recent post I found about this enlarger, hope still is active.

[Quendil]

Originally Posted by DNierga

Did you solve de problem?
I recently bought a VC6700 and I'm having a similar problem.
I've been using the lever on the bright position, because in the other one at f8 I have to expose for minutes.
I don't know the what bulb is in it, if its the original or the previous owner changed it.
Anyway, the grades colours tweaking just seems to work fine but the output light is too dim in my opinion.
Thats the most recent post I found about this enlarger, hope still is active.

I ended up giving it away as I got a new enlarger.

[Anon01]

Originally Posted by Quendil

I ended up giving it away as I got a new enlarger.

What ?


.

[Quendil]

Originally Posted by Cannik

What ?





.

I gave it away as I didn’t need it


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