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Simon Lucas

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Simon Lucas last won the day on September 28 2015

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About Simon Lucas

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  1. Stunning piece of work. I'm impressed by the sheer quality workmanship and attention to detail. Personally, I got my stepper all rigged up and working at xmas, but then I stalled when it came to designing the LED light source. Would you be willing to share more detail about how you did that?
  2. Josh - thanks for your input. I now have a basic mechanical system working - without the light and optics. A lot of it was inspired by your posts, along with some ideas from carl Hooper. I certainly got the motor spec from you and perhaps the idea of the photo-diode. Here's the initial build. Here's the one with the LED and photodiode that gives feedback to the Arduino. I'm now thinking about the light source. I was going to run an LED off the Arduino but I had no idea that LEDs could be so complex - with power ratings, current draw and heat dissipation important considerations. Also round LEDs and flat LEDs that affect the evenness of the light. I presume that with monochrome the key factors are brightness and evenness. I have seen LEDs which have lenses and wonder whether this could contribute to an even light distribution? I found these Luxeon LED assemblies, and I'm currently wondering whether they might be a good solution... http://www.luxeonstar.com/4000k-sinkpad-25mm-round-rebel-plus-led
  3. There's a really bad Star Wars joke in there somewhere. Luckily, I can't think what it is.
  4. Freya. Everything I have just read about your camera seems to say that is a good camera. It does sound like it is worth persevering with. I'm not clear what the problem is apart from the battery compartment taking some time work out. Perhaps the battery compartment is quirky. That's not unusual. To put it in context, the battery compartment on the Leicina Special is very bad. It also uses 5 batteries which threaten to fall out until the rubberised cover is on. The body of this camera has small brass pins to connect to the battery compartment that do not look like they will make good contact. But then it is also a great camera. Questions: Is the camera working when you have the batteries in? If not are the contacts all clean? I recommend a small ink rubber to clean them. Silly question, but are all the batteries the way round? (Hard to work out at times with the Leicina) How about sharing some photos of the holder? To check if there is a part missing? And when it is working I recommend buying 2 sets of 4 Eneloop batteries. They are the best rechargeables on the market
  5. Carl, I hope this reaches you before you make any measurements for me. I have found and bought a stepper. It has Holding Torque 90N.cm, Detente Torque 3.5N.cm 2A/Phase. I think it will enough. I have found a £5 Eumig 502 projector and taken out the motor. I am planning how to mount the motor, feedback unit and LED light. I hope to get this built over the holiday period. Thanks for you input.
  6. I never thought about using a feedback system – I assumed this was used by those who were using continuous motors. That sounds much more reliable and free from creeping error. That's really cleared up an area of mystery for me! Thank-you.
  7. Carl. Thank-you for your help - I'd appreciate it if you can find time. Did you find the Elmo OK for converting? And do you think it is possible to remove and enlarge the aperture in the gate?
  8. Carl, thanks for the very precise explanation of how to do this. In the UK force guages seem to be hundreds of pounds, sterling. I can look out for a sub- £20 gauge but perhaps there is another way. You could tell me what the torgue was that you needed in your elmo, and I use that as a 'rule of thumb' when guessing what to buy :) Steppers are in the range of £12-20 with a holding torque of 1Kg/cm. I'm not sure which torque measurement counts for this job but I would guess its the 'pull-out' torque. In the case of one I am looking at it has a 'pull-out' torque of between 300 and 500 g/cm.
  9. I wanted to see if I could reasonable results pushing Tri-X for indoor shooting. Push processed Tri-X. 11 mins D19. Taking in as RAW and then levelled to even out the 4 variant images. First levelled versions, then unprocessed. Tungsten lighting.
  10. I'm on the cusp of buying the kit I need to convert a Super 8 projector for scanning. I will either cannibalise my nice old Bolex (slightly reluctantly) or buy a cheap ELMO, or something similar. But assuming that the requirements for the motor will be similar across projectors, I wonder what torque I might need? And I can use a 200 step motor or would I need the more expensive 400 step motor for greater accuracy? Thanks for any advice.
  11. Hi Phil, I suppose the point of what I am doing is to show that, with negative processing almost anything can be made to work, if the image is going to be scanned and adjusted through PP. Reversal is less forgiving in terms of first developers. For me the acute flatter Rodinal is as satisfying as the more contrasty but less sharp HC110 or D19.
  12. Thanks Rudi, I have thought about it. I've never blogged. If it might help others, I thought it could be a good thing.
  13. Rudy, I enjoyed your post. I checked out the Spanish service you mentioned, Ocho Y Pico. They have a nice page of films they have scanned. And inspiring. http://ochoypico.com/en/our-works/
  14. Here's some TX, rated at 100asa, processed in D19. Photographer's Formulary D19 suggests times starting at 9 minutes* for this very active developer. But the 9 minutes which I started with gives very dense negs, so I eventually worked down to a potentially adequate 3.5 minutes. All are usable with adjustment in photoshop. The longer times give more contrast, although the dense 9 minutes neg has become very grainy and requires considerable adjustment. I think the main difference between this developer and the HC110 or APH09 developed films is a large increase in overall contrast, with much better blacks in the neg. (*I wonder whether the 9m starting times are aimed at reversal processing?) 9 minutes: 6.5 minutes: 4.5 minutes: 3.5 minutes:
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