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  1. Replies
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    Re: Filtering for a deep red filter

    Also depends on film type. Some have a response falling to zero ~650nm, some ~700nm. Just like for the light meter's response, a small difference when unfiltered, a large difference when restricted...
  2. Re: Traveling by Air In July: How should I handle LF Film?

    Agree, but I would welcome information specifically concerning:

    And, in the CT era. Here in Yur'p trucks are occasionally CT'ed.

    227449
  3. Re: Traveling by Air In July: How should I handle LF Film?

    How certain is the statement that film sent as a parcel (as opposed to luggage) will not be subjected to CT?
    I'm interested by actual experience, not internet lore. Especially private-to-private...
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    Re: Color Neg to Pos Conversion - Blue Cast

    What kind of tif file do you start with? Are you sure the RGB numbers represent linear red, green, blue intensities? Because if they are, say, AdobeRGB, they map to color intensities via some mildly...
  5. Re: 4K Orson Welles , Citizen Kane Scan and MTF , ESF and LSF Analysis

    Well, if you stated "I did A, B, C, and at this point I do not understand the relation between C and D", maybe someone could help. But

    is kind of difficult to comment upon.
    Just a few remarks:...
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    Re: Post Your Hiking Photos - Any Format

    That overhanging ice lip feels creepy. Don't stay too long.
  7. Thread: 6x17 Images

    by Bernard_L
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    Re: 6x17 Images

    Nice image.
    BUT. No need to upload a 12541x4016 pixels, 20 megabytes image, to be displayed on viewer's screen at maybe 1000x350. Just increases the page load time.
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    Re: Making Odd Sized Batteries

    ?? Just what I wrote
    "Spot welding (also known as resistance spot welding) is a resistance welding process. " from:
    https://www.twi-global.com/technical-knowledge/faqs/what-is-spot-welding
  9. Re: Features of a universal Filmscanner and why the Epson 700/800 has or has not.

    As you guessed, it has to do with the lens. I am unable to say if the lens is "inferior". But the performance of the system is going to be limited by, separately, the optical resolution of the lens,...
  10. Re: Features of a universal Filmscanner and why the Epson 700/800 has or has not.

    6400 dpi is not optical resolution; just marketing. That is obtained with high sampling (small steps) but because the optical resolution is 2200-2400, at 6400 successive samples are essentially...
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    Re: Making Odd Sized Batteries

    Should you go (nevertheless) with soldering tabs, you must use resistance welding.
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    Re: Paper negatives

    @ T.Chabry. Nice pictures. Surprising how you manage to capture the dynamic range of a snow scene onto paper that typically has range in logE of 1.2, i.e. 4 stops (or zones, for the adepts).
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    Re: MF (6x4.5,6x6,6x7,6x9,6x12) B&W film images sharing

    A few taken in 2017 at "Uriage Cabriolet Classic". Kodak 400TX. Mamiya C220, 80mm, tripod, paramender. The use of the paramender brings (I guess) the MF experience closer to LF.
    More on:...
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    Re: MF (6x4.5,6x6,6x7,6x9,6x12) B&W film images sharing

    That's easy. I used the levels tool, in FastStone (Windows, free, takes care of 98% of my adjustment needs), but such a tool is present in any image software. What you see below is the histogram of...
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    Re: MF (6x4.5,6x6,6x7,6x9,6x12) B&W film images sharing

    Nice landscape, but rendering a bit soft for my taste. British weather does not have to be that gloomy:rolleyes:
    How about this:
    224061
  16. Re: Best Way to Send the Most Accurate Copies of Fine Prints to Publishers?

    We have not heard from the OP since he initiated this thread 5 days ago.
    @christopherf how about showing your photos to this audience; not quite as gratifying as publishing a book, but a start...
  17. Re: Best Way to Send the Most Accurate Copies of Fine Prints to Publishers?

    Seconding the two points made by Pieter.
    1 - Scanning a print does not require extraordinary performance from the scanner. The critical resolution step was performed by the enlarger lens. And the...
  18. Re: Calling shop wizards: Wash widget needed

    Agree. Two requirements: agitation and water renewal. Meeting both with just one water nozzle is wasteful. I use aquarium pump for agitation. Renew water either by a few dump-fill cycles (my...
  19. Re: Hi : )!!! - Please suggest me GPC flatbed scanner

    vuescan: includes drivers. Plus, pretty good once over the learning curve;
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    Re: Cambo 470 Wide not quite sharp

    Light source presumably is not in the focal plane; not even confined to any plane. You need an object precisely in the focal plane; e.g. the ground glass, with some lines scribbled on the ground side.
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    Re: Sunny !6 Users Unite!

    A fern or stump under tree cover is something else. Typically, 1/4 f:8 (100 ISO) or 1" f:16. Guesstimating these is risky, at least for me.
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    Re: DIY 4x5 Point and Shoot

    Thank you for the explanation. And congratulations for your workmanship.

    As concerns hyperfocal setting. I give below a numerical example rather than abstract equation; you can easily change the...
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    Re: DIY 4x5 Point and Shoot

    There is a rangefinder but I don't see a focusing helicoid?
    What is the brand of the viewfinder?
  24. Re: Retaining ring for Wollensak 8x10 Rapid Symmetrical lens

    So am I. Looks like all the French buy their rings and adapters in Portugal. :cool:
  25. Re: Retaining ring for Wollensak 8x10 Rapid Symmetrical lens

    https://customphototools.com/

    Makes all kinds of retaining rings, adapters, for very reasonable prices.
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    Re: Exposing A Stouffer T2115 Onto Film

    You can at least tape the two ends: the one with the Stouffer name, and the one with the densest patch (presumably will not be within the useful range)

    But maybe with just the two ends taped...
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    Re: Multiple Print Washers?

    Duplicate. Mods please delete.
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    Re: Multiple Print Washers?

    Kudos for doing an actual test. Some caveats though.
    Outcome of HT-2 should be evaluated promptly (maybe a digital snap for the record)
    212356
    The spot (or smear) continues to darken after the...
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    Re: Fomabrom Variant 111

    Can you please state the batch number, just in case? Happy user of Fomabrom Variant 111 here.
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    Re: Trying out Chromium intensifier

    Interesting, thank you. A question: with regular chromium bleach, the degree of intensification is adjusted with the dilution of HCl, somewhere between 0.5% and 1% from "pure" HCl; less HCl for more...
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    Re: Trying out Chromium intensifier

    Something else. The +6 chromium ion is nasty stuff.
    - Beware of dust when mixing (mask)
    - Wear gloves when using solution
    - Reduce the Cr+6 ions before dumping. Figure out the mass of dichromate...
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    Re: Trying out Chromium intensifier

    Chromium intensifier allowed me to save a number of negatives obtained many hours of air travel from home (too short dev time indicated by Fuji for D-76 1+1). Selenium toner was not effective enough,...
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    Re: Heathkit Darkroom timer revealed glory!

    Update. I looked for a manual for your PT-1500, as distinct from the PT-15 around which much of the recent discussion revolved. Only found a picture.
    210849
    which tells me it is a completely...
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    Re: Heathkit Darkroom timer revealed glory!

    I looked up in the Mouser catalog for the value 2F (that is C3). In 2020, the vast majority of caps available for that value are film capacitors. Tolerances listed are 10% or 5%. That is not good...
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    Re: Heathkit Darkroom timer revealed glory!

    Adjustment. Read The Fine Manual
    https://www.vintage-radio.info/download.php?id=641
    Page 15-16 the adjustment procedure is described (R4 and R5). I would bet that the range of adjustment is enough...
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    Re: Heathkit Darkroom timer revealed glory!

    Looked at schematic posted by Paul Ron (for the PT-15) and there is nothing there that depends on the mains frequency. Indeed, the specs section explicitly states 50/60cps.
    210756
    But in case...
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    Re: help me understand color spaces (part 1?)

    The answer does not fit in a forum post. But... a starting point, hopefully useful.
    - Real colors live in perceptual color space (PCS)
    - Numerical colors live in their respective space (sRGB,...
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    Re: Developed Negatives - GreenCast

    What exactly do you call:

    Store or home scan? When I scan a color negative I "inform" the software (vuescan) of what the filmbase looks like, and what a neutral gray card (shot on same roll, same...
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    Re: Beseler 45MCRX motor struggles when raising

    +1
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    Re: Help With Epson V800

    Or some "stuff" on the calibration strip (above the scanning area). More likely, as more exposed to outside dirt than the sensor.
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