LED Enlarger Conversion: Test Prints

[@christophe1graziani822]

Magnifique l'artiste !!! Merci pour cette vidéo

[@lowe_h_seger]

Brilliant work, thanks for sharing! Would be great to know more about the LED's what they are and how you built it.

[@asa1000photography]

Thanks! There is another video with the make model etc of the led's. If you can't find the answers you are looking for, msg me again.

[@SilntObsvr]

Besides making blank-carrier prints at a light gray (Value VI?) and looking at the density by eye, you could also use a spot meter to measure the light falling on a diffuse surface at the baseboard (white printer/copier paper should work well). I wouldn't want to see as much as 1/3 stop different between any two points, and "too small to detect" would be ideal. You could/should do this in both blue and green as well as white, since contrast filtration depends on blue light for high contrast and green for low...

[@asa1000photography]

Thx! I use One color light since I am printing B&W. I've done a couple hundred prints since I built this light and I am very happy with the results. I''ve metered the heck out of it too!

[@SilntObsvr]

@@asa1000photography You don't use contrast filters?! You need both blue and green in your light to make multicontrast paper do its job. That light looks pinkish in the video, which would fit with a high contrast filter.

[@asa1000photography]

@@SilntObsvr I'm sorry, I misunderstood! I thought you were talking variable LED light. Yes, I use filters and in fact I find I'm printing more with the lower contrast end. I have been experimenting with some of the older (very old) DuPont Varigam filters with a 5 or 10cc yellow to get an in-between grade. I once had this all figured out, but todays new paper is a ReStartAllOver !

[@MacShrike]

Again: 1/30 handheld.... You have some skill man!

[@asa1000photography]

Thx! 1/30 is easy, it gets tough around 1/8!

[@MacShrike]

@@asa1000photography dude! 🫣😆

[@rossmansell5877]

Re Leds angle of view. Nichia sell a white LED of 140 deg AOV and it really is startlingly bright....

[@vladnickul]

Maybe the diffusors from a LCD screen will work better?

[@asa1000photography]

tekk me more..... thx!

[@vladnickul]

@@asa1000photography LCD screens ( like a tv or a laptop) will have some plastic diffusers some of them are opac some translucent some are fresnel like foils. I figure they must be high performance to spread the light from the backlights in such a short distance and pretty well...

[@asa1000photography]

@@vladnickul I know a guy.... I'll ask him. Thx!

[@TJCampie]

What is the benefit of this?

[@asa1000photography]

In the past I had a cold light head for my enlarger. It's more of a diffusion light as opposed to light shaped by a condenser. I like the diffusion light, it's softer. But my cold light head quit working and I couldn't find a cost effective replacement, so I switched to LEDs. Ive seen others do this. The LEDs shine through the diffusion material and they are cooler so there is less heat on the negative, which can cause it to 'bend'.