Re: LPL 4550XL + Heiland LED Explainer?
Quote:
Originally Posted by
Luis-F-S
Heat is not a problem with LPL!
Not with a glass carrier, which maintains negatives flat regardless of the fact that they're noticeably heated. With a glassless carrier, it most definitely does cause significantly more deviation from flatness than the slight amount negatives already exhibit when cold.
Quote:
Originally Posted by
sperdynamite
Aside from heat are there any other advantages that are significant over a halogen set up?
You enumerated them yourself in post #7. :)
Re: LPL 4550XL + Heiland LED Explainer?
Quote:
Originally Posted by
sperdynamite
Aside from heat are there any other advantages that are significant over a halogen set up?
IMHO, a word: No, except to make money for Heiland, the LED head manufacturer!
Since photographers like to think up problems that don't exist, I measured the temperature rise on a 6x6 negative with an IR thermometer in the standard glassless carrier, on an LPL 4500-II with a VCCE head, being turned on for a total of 10 minutes. The bulb was the 250W halogen recommended for this enlarger.
negative temperature at start: 66.9°F
light on for 1 minute-negative temp: 74.5°F
light on for 2 minutes-negative temp: 76.2°F
light on for 3 minutes-negagive temp: 79.4°F
light on for 4 minutes-negative temp: 83.9°F
light on for 7 minutes-negative temp: 83.9°F
light on for 10 minutes-negative temp: 83.3°F
So it would appear that the temperature at the negative stage stabilized after 4 minutes or so. The negative remained in focus the entire time. There is no negative pop at 83-84°F. If you get it to pop at that temperature, you have much bigger problems.
How often do you replace the EVW bulb? I'm still on the original bulb I put in the enlarger. I've bought some 50 odd EVW bulbs at auction for an average cost of $3.48 ea. And how much does an LED head cost?
Re: LPL 4550XL + Heiland LED Explainer?
A 16.4°F rise most definitely distorts a 4x5 negative in the LPL glassless carrier. Concomitant decrease in relative humidity of the emulsion makes this pronounced.
Re: LPL 4550XL + Heiland LED Explainer?
Quote:
Originally Posted by
Sal Santamaura
A 16.4°F rise most definitely distorts a 4x5 negative in the LPL glassless carrier. Concomitant decrease in relative humidity of the emulsion makes this pronounced.
That's your opinion, have anything to back it up? I use glass carriers, so I don't have a horse in this race, besides, I print sheet film in a 5108 NOT the LPL, which I only use for 6x6 and 135. Besides, most enlarger exposures are in the 20-30 sec range in which time, the temperature increase will be negligible.
Re: LPL 4550XL + Heiland LED Explainer?
Quote:
Originally Posted by
Sal Santamaura
A 16.4°F rise most definitely distorts a 4x5 negative in the LPL glassless carrier. Concomitant decrease in relative humidity of the emulsion makes this pronounced.
Quote:
Originally Posted by
Luis-F-S
That's your opinion, have anything to back it up?...
Your data from post #12 and my experience with 4x5 sheet film in both glass and glassless LPL carriers in my 4500II. :)
Re: LPL 4550XL + Heiland LED Explainer?
Yes, minutes and not seconds and my 35 year experience with 4x5, 5x7 8x10 and 11x14; and enlarging in both glass and glass-less carriers gives a different opinion from yours!
Re: LPL 4550XL + Heiland LED Explainer?
Luis, please give it a rest already. My experience with a 4500II is the same as Sal's. He's not making this stuff up.
Re: LPL 4550XL + Heiland LED Explainer?
I ordered the Heiland set up from Catlabs today. I'm just not that interested in a project and the upgrades sound worth it to me.
Re: LPL 4550XL + Heiland LED Explainer?
Good luck, please do let us know what you think once you've had a chance to use it!
Re: LPL 4550XL + Heiland LED Explainer?
Quote:
Originally Posted by
Oren Grad
Good luck, please do let us know what you think once you've had a chance to use it!
Indeed, and, if possible, please include some pictures of the installation. Thanks in advance.