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Any B&W fixer wil PROBABLY work, but I'd recommend to use a near-neutral pH fixer (ca 6.5 would be nice). Acid fixer is not a good idea due to the risk of dyes (esp cyan I understand) remaining in...

These could be poor marks or even just drying marks.carefully examine the negatives, particularly the shiny side.

Sounds good!

As to the opamp and its offset voltage: it's not so much the opamp, although the 741 is ancient technology and positively abysmal in terms of today's quality standards. Yes, it will...

A quick Google exercise turns up this thread: https://www.photrio.com/forum/threads/fs-photronix-densitometer.64325/
It features a schematic (of doubtful image quality, but it's sort of readable):...

In the first version of my led enlarger I tested a deeper color of blue. That is, for the final version I went with the universally recommended royal blue, which is around 450nm. Most/all led strips...

@Ulophot, I understand about the typo and the fact someone else is building this for you, ok! The blue/green ratio still seems way off to me for a mid-range (ca 2.) contrast. You might want to look...

1: You don't need the red for B&W printing. It's plain and simple like that, so don't worry about it.

2: There's something very strange with your setup if you need more than an order of magnitude...

Yes; the Supreme is a significantly better paper in several respects IMO. It offers better dmax and comes on a somewhat sturdier base.
I did not compare it side by side with DPII in terms of...

That's a very usable enlarger and it seems to be in excellent condition as well. Moreover, this setup is not one of the 1980s-high-tech electronics contraptions that have become a maintenance...

That's taken from the pdf I linked to earlier.

Not any more than cleaning the toilet does.
But a Andrew remarked, it's really not worth it to begin with.

I'm not asking for myself but for others in the future with the same question so that they may more easily find this documentation.
I myself don't own this piece of equipment and likely never will.

Could you post a bigger version, please? I also found the one you posted online, but it's illegibly small and therefore useless.

I searched for them when you first posted but haven't been able to find much of use.
There's a service manual online that also covers the EST1000 (pages 10-12):...

You don't need a yellow light; red is just fine.


Might be OK for the dedicated contact printing paper @Willie mentions (Lupex, Lodima, Azo), but on regular printing paper (variable contrast or...

Sounds like the fan exhibits excessive friction, likely due to the buildup of dirt and dust in it. See if you can clean it, or, perhaps more appropriately: see if you can get someone to replace it...

Yeah, I think the original pyrocat formula called for something like a 20% sodium carbonate solution instead of potassium and then use something like 5x as much as it.

The main challenge would be...

https://www.deoplosmiddelspecialist.nl/
They will sell you the carbonate and some other stuff depending on what you need. For more specific stuff but very, very long lead times (up to 6-9 months on...

Foma MG Classic 131 vs Ilford MG FB WT
Fomatone is pretty close to MGWT in terms of max contrast, but grade 0 is pretty different for both papers. You can compare with neutral tone emulsions based...

400-speed film, even Portra, that's over a decade old will certainly show decreased performance. It might work OK-ish at 200 if you're not too critical about image quality. There'll be some...

Like I said, anything can be corrected in PS. I don't doubt your results were satisfactory to you.

I'm also aware of what Sandy is looking for. Hence my earlier comments. The Bonavolta recipe is...

4g/l of sulfite doesn't sound right for c41. If the hydroxylamine is a problem, I'd suggest using a more same amount of sulfite (ca 1.0 ~ 1.5g) and just leave out the hydroxylamine sulfate. Mix...

You won't have to; exposures will be just a few seconds at a small aperture. Reciprocity is not going to be an issue. Just give it a try; expose say a 4x5" sheet in strips of consecutive stops (1...

I agree with Greg. Especially if you're going to do the LED modification yourself with a DIY approach, I would start with any old enlarger you can get your hands on. Heck, doesn't even have to be 4x5...

I've done quite a bit of DIY C41 and the differences between the various formulas I tried (including the ones linked to earlier) were minimal. I also found it just wasn't worth the hassle; the...

Ouch, yeah, that sounds bad. Good to hear a replacement is on its way!

Should be fairly easy to track down this particular problem. Just measure the voltage between the outer pins on the pot to establish which one is negative (most likely ground) and which is positive;...

It's probably precipitated sulphur. If you allow a lot more to accumulate it'll look slightly yellow. Sulphur precipitated this way is indeed difficult to remove. Just scrub well.

C41 developer is NOT essentially a b&w developer! Bleaching Ektar negatives developed in DDX will give blank film with just the mask left, no image.

Partial bleaching is theoretically possible to...

Well, wet plate is extremely slow and has negligible sensitivity to green light, so pretty much any kind of red or yellow light would be ok for it. Paper is a whole different matter, and fast ortho...

Sure, leds have a narrow spectrum. But they also have secondary emissions outside their primary spectrum. That's where the problems stem from. Take your cheap strips and view their light reflected on...

Try covering the bulbs with rubylith. Two layers generally does the trick. This cuts all but the red light, and dims the red light less than you'd have to do to get safe levels without the additional...

Red leds work magnificently; some straight out of the box,and some require additional filtering with e.g. rubylith to cut put the secondary green/yellow emissions. I've been using cheap Chinese...

Yes, sort of. There are many caveats. But the principle does work. See here for extensive discussion, experiments and proofs of concept:...

No worries, you'll rarely catch me on that. As well as dogs.

I thought this thread was about random non-sequiturs loosely related to enlargers.

I am. Many other are, too. Perhaps not in the LF scene, but over at Photrio there's a pretty active interest in optical RA4 printing.

Not all led power supplies are created equal, sadly (or perhaps fortunately - they might all have been junk in this respect).
Case in point: I purchased a led strip + fitting power supply the other...

Lucky you. My first LED color head had around 100W net power. This was insufficient to conveniently print on warm tone paper from 35mm negatives onto sizes of 11x14". I like to keep exposures between...

Yeah, there's many challenges Tin Can, I know. Before you know it you'll be going through a crash course of electrical engineering instead of making images. 'Luckily' for me electronics has always...