Type: Posts; User: Bruce Watson; Keyword(s):

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  1. Re: Precision and Accuracy in LF Photography: How much is enough?

    Accuracy and precision are two different concepts -- they are not synonyms for each other. First thing you have to do in any discussion is to agree how to define your terms. Otherwise, your...
  2. Replies

    Re: Reversal vs negative

    Add to the cons:

    * Very small dynamic range compared to negatives.
    * Very high Dmax which makes scanning difficult.
    * trannies may be WYSIWYG, but WYS isn't as color accurate as negative films...
  3. Re: Now e-Bay wants my SSN and bank account info . . .???

    It's about identity theft. Time for you to get physical token like a Yubikey and use two-factor authentication. That and a password manager might help you mitigate the effects of the constant phising...
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    Re: Need More LIGHT: Should I start PUSHING?

    Many people making the transition from small formats to larger formats feel like this. But the science doesn't back them up. Exposure is exposure and is not format dependent.

    The problem with...
  5. Re: the thread for Kodak XTOL quality control issues

    Excellent -- I missed that bit. Well, OK, I haven't been paying that much attention. I'm glad you were. And please do correct the history -- I'd like to know the complete and correct history myself,...
  6. Re: the thread for Kodak XTOL quality control issues

    Um... this is photography, yes? Kodak got out of that business back in 2011, because of its bankruptcy. I think they still do motion picture stuff, but consumer photography got sold to a Brit firm...
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    Re: T-Grain Developers

    Years ago I exchanged a few emails with Silvia Zawadski and Dick Dickerson of KODAK, who were the inventors of XTOL. They told me that they created it using TMX and TMY in rotary processors...
  8. Re: developing with x-tol - agitation and Films

    Same here.

    Years ago I exchanged some emails with Silvia Zawadski and Dick Dickerson (creators of XTOL for Kodak). They said they created XTOL using a Jobo rotary processor; that it's...
  9. Replies

    Re: Metering Technique...any problems here?

    Yep. This. Exactly this.
  10. Re: Diffraction. When does it really matter with LF?

    Everything in LF is a trade off. If you open up too far you have shallow DOF. If you stop down too far you soften the image through diffraction. Etc. The bottom line as you'll find eventually, is to...
  11. Replies

    Re: Water seal for jobo 3010

    It's not as hard as you might think -- the drill bit is hard, the plastic isn't, the bit is small in diameter, and there's no serious need of accuracy. A few degrees off plumb won't matter much. And...
  12. Replies

    Re: Water seal for jobo 3010

    If the crack continues to propagate (it probably will), you can probably stop if from growing by drilling a small hole (small as in a millimeter in diameter or so; bigger won't make it work better...
  13. Replies

    Re: Reciprocity and reducing development

    Yes, and this is probably the case for the vast majority of exposures. People tend to think that a given exposure is either in reciprocity failure or not. In reality that's hardly ever the case....
  14. Re: What small lightweight lens for 4x5 backpacking?

    Kerry Thalmann was our resident expert in lightweight LFP kit, especially for hiking. He's still keeping his old website up, but it hasn't been updated in quite a while (a couple of decades?). That...
  15. Re: Disasterous Consequences

    No, not really. Sorry.

    OTOH, you got your first lesson in LF -- the ground glass does not lie. It took me a lot longer than my first trip to fully, viscerally, understand that. Once I latched hold...
  16. Replies

    Re: Tri-X Reciprocity Failure

    I found for my landscape work in 5x4 with Tri-X that I routinely had exposures around 1/4s. This meant with Tri-X that I was right on the edge of reciprocity failure in my shadows (Zone III). Try as...
  17. Replies

    Re: Shot abandonment

    Because... snowmelt! That had to be cold. I hope you were wearing a good jacket with a hood.
  18. Replies

    Re: Shot abandonment

    One of my primary rules is "look at what everyone else is looking at, then turn around and look directly behind you." It's amazing what else is around -- interesting scenes seldom occur in isolation...
  19. Replies

    Re: Shot abandonment

    Feh. I stand corrected.

    My wife reminded me of a shot I abandoned after pulling the dark slide. I was in the middle of a river. Found a rock with room for me and my tripod and not much else, so...
  20. Replies

    Re: Shot abandonment

    Interesting question. You do have an insightful streak ;-)

    I've abandoned many setups. But I don't think I've abandoned even one where I've inserted a film holder in the camera. If I abandoned a...
  21. Replies

    Re: Why not a rangefinder?

    What view cameras give you that smaller formats don't is the bellows between the lens plane and the film plane. So you can move the lens separately from the film, utilizing what are generally called...
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    Re: Light Streak

    Looks like lens flare to me.
  23. Replies

    Re: Resolution Comparison Between Films?

    Well, you did ask for an opinion. Here's mine. In LF, it just doesn't matter. That's one of the major reasons to move up to LF.

    One of the things you get by moving to LF is the considerably...
  24. Re: Are the higher shutter speeds on large format lenses always off?

    Yes. But it doesn't matter that much since you typically can't use those shutter speeds much anyway. In the decade I kept track of such things I only used a 1/125 speed once or twice. Nothing faster....
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    Re: 4x5 Starter Lens

    I recommend that your first lens be a 150mm, a "normal" lens. Yes, yes, yes, I know you didn't even own such a lens in 135 format. But this isn't 135 format. With LF you have separated the film plane...
  26. Replies

    Re: Which lens would you choose?

    If it had to be one of these, the Apo Artar.

    When I was faced with this choice, I bought a coated Fujinon-A 240mm f/9 (inside writing?). The second lens I ever bought, and it remains one of my...
  27. Re: Problem obtaining adequate depth of field with field camera

    Exactly this.

    There are learning curves associated with learning camera movements. Initially it can be frustrating, but at some point most of us have an "aha moment" where it all clicks together....
  28. Replies

    Re: Changing bags and dust

    Par for the course I think. Dust is the enemy we can't defeat. All we can hope for is to diminish it.

    My prep for road trips used to include cleaning my Harrison -- I'd take the Harrison into my...
  29. Replies

    Re: Do we need the mylar?

    I don't have a good idea of how exactly you are scanning, so I can't comment on that. And I don't have any idea of your background, so I'm going to assume you aren't a drum scanner operator. If I'm...
  30. Replies

    Re: Another digital versus analog showdown

  31. Replies

    Re: Relevance of zone system when scanning

    Yep. If you don't want to hear it from me, listen to Doremus here. All he says is true. And the detail backing all this up has already been posted ad infinitum, in a number of threads about this very...
  32. Replies

    Re: Relevance of zone system when scanning

    Do some searching. There was a huge discussion over a number of threads about 15 years ago or so.

    Bottom line (for me anyway) is that when used with chemical darkroom printing, a film negative is...
  33. Re: "By Request of Mark Osterman in Memorium of Ron Mowrey"

    Hard to believe that Ron Mowrey who posted as "Photo Engineer" on APUG / PhotoTrio has died. He was an incredible source of knowledge in all things film and chemistry. An excellent teacher with...
  34. Replies

    Re: Alignment workflow (architechture)

    Getting the image "distortion free" is largely an exercise in using camera movements. To get the level of control you seem to want can be daunting. And it can take quite a while; these aren't 10...
  35. Replies

    Re: Xtol - Distilled vs Filtered water

    Indeed, it is not. XTOL is sensitive to dissolved iron. Conventional filtration won't take out the iron. Enough iron and you get "sudden XTOL failure" IIRC (search for it on this site -- it was...
  36. Re: Is it worth it to use the Speed Graphic handheld from time to time?

    Margaret Bourke-White was the master of handheld 5x4. She put many many covers on Life Magazine, at least some of which were hand-held. Dorothea Lang was another world famous hand-held expert.

  37. Replies

    Re: How sharp can I expect from 4X5

    First, define "sharpness".

    There are many reasons to use LF. My primary reason was the separation of the film plane and the lens plane so that I could use movements to control the plane of exact...
  38. Re: Comparison of Howtek 8000 Resolve to Epson V850

    Half of what you get from a drum scanner is fluid scanning. I wouldn't give you $0.05 for a dry scanned image from a drum scanner.

    Sadly, like you I wasted a bunch of time when I first got my...
  39. Replies

    Re: ISO Question

    They would be, yes. Two stops over exposure. You could try developing one stop less. You could go two stops less if you have sufficient development time available. Else you risk streaking.

  40. Re: 150mm lens suggestion for landscapes on a Cambo 45NX

    I've got one (S version). Love it. Probably 30% of my images are from this lens. It's got plenty of coverage so you can play with movements (how else you gonna learn?), and it's sharp as a tack. Hard...
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