Recent content by pwadoc

You can also make your own control strips. There's actually device (I forget what its called but I have one lying around somewhere) that can automatically expose the strip on any piece of film, but you can also just make one yourself out of a transparent step wedge. Have the strip developed...

Just to provide some context to what I'm saying about thermometers, a few months back I went and tested all of the thermometers I have against my gold standards. I have two glass thermometers, one a NIST-certified alcohol model, and a mercury thermometer which is not NIST-certified because NIST...

Yeah, you would probably want some very bright LEDs for this purpose, though from my experience developing an RGB light that I was using for some tests in scanning film, the light was bright enough that a fully exposed frame of slide film would still transmit a fair bit of light. Like I was...

So might be missing something, but my sense is the linearity of the sensor is only going to matter if we care about the absolute value of the reading. Like, I need to take a reading with this device, and have it match up to an absolute value of density from 0-4 that I'd get on a traditional...

I tend to disagree that any time not spent making images is wasted time. I've built so many tools for photography, and every one of them has taught me something that I've been able to make use of, and usually I get a useful tool out of it too. Plus there's the fact that photographic equipment...

I'm going to go out on a limb here and say that it is very unlikely that a $15 thermometer has a ±0.02C accuracy. Thermometers with that level of accuracy usually cost a few hundred dollars. The economics of just the sensor alone tend to make these things very expensive. A class A RTD costs...

I think it should be possible to built a homemade densitometer. You could potentially use a digital camera, but that might actually be overkill, and you would really need to carefully characterize the response to color response of the sensor. If you think about what a densitometer does in the...

Yep, that's the one of the ones I have! Very solid and reliable. Interesting idea reinventing the densitometer, I'll give it a read! I managed to pick up an X-Rite 810 for $100 after watching eBay for a few weeks, so there are still deals to be had out there. But generally yes the price of...

So I'm just going to note here that none of the temperature instruments used in this thread have an accuracy high enough to verify the temperature of the developing process better than the Job does. They may have _precision_ close to 0.1C, but precision and accuracy are very different, and...

I used a very large set of bent needle nose pliers. Basically you get the open ends under the gears and apply some leverage.

I believe the service manual for the ATL-1/2 was shared a few pages back in this thread.

The backup battery itself doesn't cause the problem. It's the damage to the controller board that doesn't allow the Hall effect sensor signal to disable the position motor.

I had pretty much this exact problem. You are correct that there is a magnetic sensor (hall sensor) that detects the position of the air distributor system, though the sensor itself is very unlikely to fail as it is a robust part and is encased on silicone. The most common cause for this is that...

I second what Adrian said about the NS holder, truly the best 35mm and 120mm film holders you can buy, but their lights are absolute trash. In my opinion, edge-lit lights are not bright enough for scanning. The exposure times end up being too long, and your scans end up suffering as a result of...

The only consumer scanner I know of that can achieve 6400DPI is the Flextight, which manages 6900DPI for 35mm, and only portrait orientation. I think at that point you're probably well beyond the noise floor of most film, but in certain very theoretical conditions, with an extremely high end...