Jump to content

glen_h

Members
  • Posts

    7,733
  • Joined

  • Last visited

  • Days Won

    5

Posts posted by glen_h

  1. On 11/12/2023 at 8:53 AM, Ricochetrider said:

    (snip)

    I carried my film in a lead "bag", in my carry on luggage- which went through a security check at every airport. Rather than saying anything to anyone (having been previously met with mixed results in various US & world airports), I just handed over my closed carry on luggage and let them run it thru the X ray machine.

    (snip)

     

    Some time ago when the lead bag inside my carry-on bag went through the X-ray, they asked to take the bag out, and run it through separately.

    But didn't ask to open the bag.

     

    It seems that the current models can see through lead bags.

    As always, it is a dynamic range question, and they now have enough to do it.

     

    Well, even more, it used to be 20keV was common, and lead bags do pretty well with that.

    Many now, though, do both 20keV and 70keV, which allows them to differentiate materials.

    But also, 70keV goes through lead well enough to image through it.

     

  2. I was recently in Europe, with some rolls of film, but more important, two packs of Instax Wide.

    As usual, no problem with TSA, but I wasn't sure about Europe.

    At CDG in France, they were nice about it when asked, and used the usual swab test.

    Going out from Barcelona, they pointed to where it said safe to ISO 1600 on the machine.

    I pointed to where it said "No X-ray" on the Instax box, and so they did the swab test.

     

    I had originally thought about not bringing Instax and buying some there, but brought two pack that might be 10 years old.

    (There are at least four years old, from when I got them, already old.)

    So then in Fatima, PT, I found a tiny photography store, and asked about Instax film.

    First they pointed to some rolls of Kodak 35mm film, maybe about 10.  I said, no Fuji.

    Then they found the two boxes of Instax wide, expired in only 2019. So I bought one.

    I ended up only using the orignal two packs, which worked fine, and so brought back

    the 2019 packs.

     

    I don't know how sensitive Instax film is in ISO terms.

  3. There used to be a paper, I believe from 3M, but I might have forgotten, that is silver halide based and develops with heat.

    It was commonly used for microfilm viewers, but also Tektronix made a printer for its 401x series of graphics terminals that used it.

    The Tektronix 4610 printer has a single line CRT that scans as the paper moves by, and then through the heat developer.

  4. Ilford makes some arguments based on the shape of the characteristic curve.

    The usual ISO rating depends on the usual shape of the curve.

    The question you are supposed to ask, is how it compares to Delta 400 at 1000.

    PICT0115s.JPG.c3f3adf67e90fddd92b865ab47fc5eae.JPG

    This might be TMax 3200 instead of Delta 3200, as I have had both.

    It is taken lit only by a full moon, though stars are visible.

    It is in an FT3 at 1s and f/3.5, as I didn't have a cable release to take longer exposures without camera motion.

    It is developed with the push to 25000 time, but I suspect that 3200 is closer to right.

    Stars are visible in the sky.

  5. On 11/3/2023 at 11:41 AM, BeBu Lamar said:

    That is a BS law. I don't even think the USB-C connector is a good one for charging purpose. Also that requires all the charging controls as well as a buck/boost converter to be built in to the device rather than the charger. You don't want those weight and bulk on the device when you're doing the charging. 

    USB-C negotiates the voltage and current between the charger and device.

    That should be enough to avoid a converter in many cases, that wouldn't otherwise need one.

×
×
  • Create New...