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    Re: What is this differential fading?

    That's it Bill!
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    Re: What is this differential fading?

    Thanks for the replies. Yes, the white paint not fading as much sound plausible. I will tell the owner of this photo that his white paint is "good quality", and he will probably like it better.
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    What is this differential fading?

    A friend sent me this picture of a family portrait from about 1908. One of those chaps is his grandpa. Given the date, would it have to be a hand colored photo? Anyway, what my friend noticed is...
  4. Thread: Aircraft

    by peter ramm
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    Re: Aircraft

    That last one is great!
  5. Thread: Aircraft

    by peter ramm
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    Re: Aircraft

    Thank you. That brief moment in time between a fresh overhaul and a life covered in oil.
  6. Thread: Aircraft

    by peter ramm
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    Re: Aircraft

    Nice to see this activity. Here's one from a while ago, trying to remember how it was done. FP4, 8 x 10, Rodie 240S I think

    163337
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    Re: Is Betterlight Still the Standard?

    Has anyone tried the current generation of linear scanners like the Uberscan?

    http://colourgenics.com/?category/Uberscan

    I did a lot of "archival" scanning years ago and area detectors never...
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    Re: Must divest - best way?

    Jac, I have no idea what you are holding but here is my experience with divesting and doesn't much matter whether it is photo equipment or a collection of celebrity underwear. It depends first upon...
  9. Thread: Aircraft

    by peter ramm
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    Re: Aircraft

    No immediate plans, Miguel. The only one in the EU (F-AZLL) belongs to Bernard Chabbert and flies out of Ferte, I believe.
  10. Thread: Aircraft

    by peter ramm
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    Re: Aircraft

    Let's resurrect this.

    Sinar P2, FP4+, Rodie 240mm af F32, 7' tilt, Epson scan of the 8 x 10, cropped and tweaked in PS
  11. Re: Deciding on a 4x5 for digital conversion project

    Agree with BobS. Digital view cameras with full movements on front and rear can be fairly cheap used (about $3K for a P3, M679, or AS Monolith), but note that it is hard enough using these with MF...
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    Re: Alternatives to Gitzo Series 5 tripods?

    A cube with LF! I use it with MF all the time, but it sure doesn't have the guts for studio view cameras. A 4 x 5 field camera would be fine, but a Sinar or Foba head is a much better match with an...
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    Re: Calibrate a transmission densitometer

    I don't know what a "non-standard transmissive densitometer" is.

    0 D absolute is air, by definition.

    Pretty close, and it doesn't matter in photography - unless you make film. Kodak used to...
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    Re: Calibrate a transmission densitometer

    You are absolutely right Leigh. Musn't mix up my transmittence and D values. D-uh.

    Anyway, the general argument is that 0 D on a non-standard transmissive densitometer is actually 0 OD, and...
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    Re: Calibrate a transmission densitometer

    The response of a densitometer is highly dependent upon the optical path. The film itself is part of that path and scattering within the film will materially affect density measurements.

    That...
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    Re: Can this be true ? Jobo rises again ?

    Thanks Bob. What I will miss when the ATL dies is the start it and forget it convenience. Sigh.
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    Re: Can this be true ? Jobo rises again ?

    Bob, tell me more about your local solutions to the processor problem. I have a really ugly 2200 that works but could sure use some TLC. Are you saying you have a tech who can work on these?
    ...
  18. Re: I FINALLY Understand... Bokeh & Aperture Roundness

    I think there is a naive inclination to trust image processing as an "enhancement" process. When I say naive, I mean just that. Most people are inexperienced with the fundamentals of image...
  19. Thread: Aircraft

    by peter ramm
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    Re: Aircraft

    Does anyone remember the framed B&W prints that used to be in the lobby of the Toronto Airport Hilton? Very mechanical pics of props and engines and the like. I remember seeing them some years ago...
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    Re: DSLR Scanner: Light Sources

    Rick, have you considered trying this type of LED back light?

    http://www.edmundoptics.com/products/displayproduct.cfm?productid=3358

    Can't remember if it has come up here or not. They work...
  21. Thread: Aircraft

    by peter ramm
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    Re: Aircraft

    Just a typical aircraft pic but it makes me feel like flying.

    Sinar 8 x 10, fp4+, ApoSironar S 240mm @f32

    71138
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    Re: Making a scanner with a DSLR

    Interesting observation Peter and Rick. Indeed, film has no set bit depth. It is dependent upon the RMS noise present in the sampling window. Over a small distance, grain becomes dominant and a few...
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    Re: Making a scanner with a DSLR

    Peter, I think this is the package that Epson is using. Next step would to contact suppliers like Dalsa, Kodak, Fairchild etc. and get suggestions. Not my area of expertise but there are other...
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    Re: Making a scanner with a DSLR

    Straun, the Harvard system is a rara avis. Good for them. I've seen so many one-offs sitting in back rooms and ultimately cannibalized for parts.

    Given the level of expertise that participants...
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    Re: Making a scanner with a DSLR

    Straun, thanks for posting the link. I love weird and wonderful systems. Wonder if Harvard actually ended up using it for the specified project. What often happens with things like this is that a...
  26. Re: EPSON Scan settings: which Gamma setting is "normal" ?

    Ken, getting deep into film densitometry is admirable, but sort of like tasting from the tree of life. It may drag you from photography eden, where your eye is the judge of what you do, into a bleak...
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    Re: DSLR Scanner: Camera Supports and Positioning

    Rick, the image you posted in the stitching thread shows that you have really made progress - and an effort! Looks like you are having fun.

    Sorry to introduce one more complexity but I see fairly...
  28. Re: DSLR Scanner: Stitching and Blending of Images

    Rick, distortion and blending are both issues. Re distortion, the eye will not usually see it that much in a single field, but if it repeats across fields it will be much more evident - just like...
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    Re: Making a scanner with a DSLR

    Cesar, microscope stages are made for small movements. The largest I am aware of handle microwell plates (about 10 x 7 cm). You might find one that handles 4 x 5" scanning, but the retail on...
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    Re: Making a scanner with a DSLR

    Peter, here are a few links you may find interesting. This stitching system is for microscopy, but discusses some general issues.

    http://www.mcid.co.uk/applications/montaging.asp

    This macro...
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    Re: Making a New Modern Drum Scanner

    Ben, I have designed camera-based scanning systems and spent infinite hours using them at everything from macro to micro levels. It is not my intention to be a naysayer, or to get into detail about...
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    Re: Making a New Modern Drum Scanner

    Peter, as I understand it the quality minimum you are after is defined by the performance of a typical consumer flat bed scanner, such as the Epson. Let me try to be helpful in telling you what you...
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    Re: Making a New Modern Drum Scanner

    You know, Frank, if you check out my description of the stitched spider above you can probably save a bundle on models and the type of scanner you use wouldn't matter much.
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    Re: Making a New Modern Drum Scanner

    Dave, as a fellow canuck I am hinting that you can dig this pit as deep as you like and there ain't no bone in it. The problems are not obvious until you have some montaging experience and that is...
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    Re: Making a New Modern Drum Scanner

    Peter, this has been done, is being done, and will be done better in the future - perhaps by you. I think if you search on medical image stitching, for example, you will see lots of stuff. Then...
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    Re: Making a New Modern Drum Scanner

    Wow, 23 pages. I can't read it all but perhaps someone (Frank?) wants to summarize what is a very interesting topic.

    We used to make camera-based scanners that created step and stitch images at...
  37. Re: arca swiss z1 with 8x10 - how is it in reality!

    No experience with the ball head, but I use the AS cube a lot for MFD. LF is another issue. OK with an 8x10 Kodak 2D and a compact lens. However, support is marginal with something like an Apo...
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    Poll: Re: advice needed, new digi view or linhof

    Tech (pancake) cameras have limited movements (I have Alpas), so they are not much use for tabletop, for example. Even a simple tilt may require some fiddling and is a pain. Compact, sexy and great...
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    Re: convenient Sinar mounting/dismounting

    Sorry guys, my bad. I neglected to mention that the camera is on a dual base plate (attached pic stolen from the auction site). That's what makes it so heavy. I think the last time I ranted about...
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    convenient Sinar mounting/dismounting

    Recent thread about a Linhof Master has me wondering again how to best mount my Sinar P2 (8 x 10). I need to move it about, from the place where it sleeps (my office) to the place where it is used a...
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