What part would do this? (optoelectronics)

There are commercial processors in the Toronto area, and I'm sure in several US cities. It's a niche market, but wherever there are bunches of creative types..

Of course it's not cheap any more. Film might be the real problem long-term, especially color film- I bet there's a lot of cost in keeping the film production going. Kodak still makes Tri-X for the B&W market.

Some people like to capture the photo on film, then scan it in extreme resolution (capturing all the grains and such like) and manipulate the image digitally, then printing it out digitally.

--sp

Not really. All I have to do is hop on my mountain bike and within less than 1/2h I can be in an area where there's zero bars for the next hour or so. Meaning you can't call any help if something happens. With a ham radio transceiver you can.

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Regards, Joerg 

http://www.analogconsultants.com/

I never got into ham radio. All you can do is talk to other guys who have ham radios, and they mostly want to talk about ham radio.

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John Larkin         Highland Technology, Inc 
picosecond timing   precision measurement  

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com

Mostly yes but there were some very notable exceptions. We had an evening round on the 80 meter band that was pretty loose in conversation topics. Rock music, beer, cars. I also thoroughly enjoyed international "rag chewing" conversations where I got to learn a lot about how people lived in very distant countries. But by far the most significant benefit for me was that ham radio taught me a lot more and better than university. All hands on because we actually built the stuff we designed. Designs were usually done in teams and the capital investment was a crate of beer. Or maybe two. Since I've always believed in good documentation I also ended up with a fat binder full of comleted projects which I brought to the interviews for my first job despite strong opposition by some "career advisers". The hiring managers pored over it and all interviews resulted in offering letters.

Oh, and I also learned English that way.

--
Regards, Joerg 

http://www.analogconsultants.com/

--- If you never got into ham radio, then how can you claim to know what it's all about?

You claim to love electronics, and yet you dis ham radio as if it were a bastard child - not of your patronage, of course - which you place yourself above and to which you'd like to dictate your control freak terms.

Same goes for bashing audio and anything you don't happen to be into when you get your period.

John Fields

Ah, that makes sense. If I ever get the time, I'll get back into it. I have a bunch of Canon FTBs and a stash of eBay lenses that I could never have afforded when I was heavily into B&W photography.

I'm pretty sure there are commercial color processors here still. B&W processing can be had at some specialty camera shops but it's ridiculously expensive. It's all custom work and costs like it.

Ilford appears to make a pretty good selection of films, too. Their paper used to be the best stuff going. I used a ton of their ultra high contrast paper.

I made no such claim, and I know very little about ham radio. Well, I did know some hams, and I have read the ARRL handbook, but I never did it myself. Seemed sort of qualitative and talky and boring to me.

Ham radio is mostly about talking to other guys. That part doesn't interest me.

You really hate women, don't you? Good: you deserve it.

--

John Larkin         Highland Technology, Inc 
picosecond timing   precision measurement  

jlarkin att highlandtechnology dott com 
http://www.highlandtechnology.com

The smaller sensors should allow a more accurate measurement of the exposure time. The larger sensor is interesting too.

The larger photodiode (PD) would show a nice slope as the shutter moves across the sensor. It might be interesting to see if the shutter maintains a uniform speed by looking for changes in the slope. Also, the known width of the PD provides a nice dimensional calibration point. In the case where the shutter slot is narrower than the PD, the slope of the trace between the rise and fall regions would show the differential speed of the two shutters.

If you have an analog scope, monitor the TIA output and hold the sensor up to the trace. The scope trace will react to measuring itself. The positive feedback stops when the trace deflects enough so that the PD can't see it.

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Best Regards, 

ChesterW

I recently destroyed two 55 mm f/3.5 Micro-Nikkor macro lenses with a Dremel tool, so that I could use the remains in an optical setup. (A

2-D acousto-optic scanning system.)

They were much cheaper than anything else that had a prayer of working, but it still felt like vandalism.

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 

hobbs at electrooptical dot net 
http://electrooptical.net

That's why I suggested using one phototransistor at each edge of the film aperture. You get a much crisper measurement of the same effect.

Also, the

But it's sensitive to alignment and so on, and less accurate than putting a phototransistor on each side.

Those TI PD/TIAs have been around for yonks, but they aren't very good for anything that I've ever needed to do. The op amp is noisy, the built-in 1M feedback resistor is restrictive, and the whole thing costs twice as much as a nice photodiode (e.g. the BPW34) and a reasonable op amp. (Of course, I'm a bit of a connoisseur of photodiode front ends, so they're probably fine for lots of things where you don't need the ultra-ultimate.)

Cheers

Phil Hobbs

--
Dr Philip C D Hobbs 
Principal Consultant 
ElectroOptical Innovations LLC 
Optics, Electro-optics, Photonics, Analog Electronics 

160 North State Road #203 
Briarcliff Manor NY 10510 

hobbs at electrooptical dot net 
http://electrooptical.net

Thise Nikor and the Canon FD lenses were things of beauty. I grabbed a

200mm F2.8 and a 300mm F4 lens from ebay for less well under $100 each. No, I have no intention of taking a Dremel to them. ;-)

Hereabouts, we measure those in ya'lls instead of yonks.

Speaking of long periods of time past, this week I met Forrest Mims. I loved those books!

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Best Regards, 

ChesterW

To my surprise the prices of some of the Minolta lenses went up well after the demise of film cameras. I think they are compatible in their mount with some Sony digital cameras.

The market is a mere speck of what it onces was so boutique pricing is almost inevitable. I wonder what the market is for compact cameras with integrated lenses. We've got a nice one from Leica for 35mm film, like new.

--
Regards, Joerg 

http://www.analogconsultants.com/

I have a couple of 250mm lenses for Minolta. With the micro 4/3rd CCD sensor in the Olympus they act like 500mm would on 35mm film. Held it out into nature for a test, snaped a pic, loaded the file onto the PC. Suddenly I could zoom into a distant contruction site sign that I could never read from here. Not only could I read the company name but also the phone number and all. Amazing.

--
Regards, Joerg 

http://www.analogconsultants.com/

Possible. Often this "compatibility" requires that the lens has to be stopped down to meter and the automatic stuff is disabled. Basically, the mounts fit.

If you really want to know what the market for it is, look on eBay.

With the (very basic) adapter to my Olympus PEN even the stopping down no longer works. I have to set the stop to whatever I think is appropriate and look at the ring to see the number. For flash photos at night that's tough because you have to temporarily crank it all the way open to see anything, then back down for the photo. You have to kind of memorize the hand rotation to get that right which took some practice.

Never seen that model at an auction site. I guess the only way to find out is to get an Ebay account, list it and see what happens.

--
Regards, Joerg 

http://www.analogconsultants.com/

It's a big pastime with different things for different people. I've been a ham for 35 years and talking to other hams is not a major interest of mine. I just like messing around with the technical aspects of the hobby: experimenting, designing and building stuff.

And the build quality is great, isn't it? They just don't make lenses with that certain *feel* any more - and the lovely glass optics of course.