Keeping my office clean is super important for me, especially since I have a deep aversion to dust. Ugh, can't stand it. I've opted for a solution that has worked wonders for me: hiring a...
Type: Posts; User: maltfalc; Keyword(s):
Keeping my office clean is super important for me, especially since I have a deep aversion to dust. Ugh, can't stand it. I've opted for a solution that has worked wonders for me: hiring a...
Wow, that's a solid roundup of large format channels! Love seeing so much dedication to the craft all in one place. By the way, since we're on the topic of sharing cool stuff, I've been getting more...
if i'm picturing this right, the actual ground glass is closest to the lens with the fresnel behind it and plain protective glass behind the fresnel, so installing the fresnel either way won't throw...
got this one perfectly spotless using tap water, a few drops of cheap dish detergent and a thrift store ultrasonic cleaner, then folding a paper towel around it and patting it dry.
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if the grid is printed onto the glass rather than etched, it may wash off while cleaning it.
windex or any other ammonia-based cleaner absolutely will attack plastic like acrylic fresnels.
projector lenses (non-zoom). fast and cheap(ish). buhl, leitz, kodak, lots of options. image circle usually roughly matches focal length. russian projector lenses are dirt cheap but some are just...
something to do with breaking up the diffraction rings that form around fine details at small apertures.
are you sure the gg is installed and not just a fresnel on it's own?
the results aren't too far off, but those aren't remotely the right filters to actually match the spectrum of ortho film. the whole point of ortho was to add sensitivity to greens and yellows, which...
they're not. 150mm or 6" is the normal lens for 4x5, 135mm is a slight wide-angle.
what's your max bellows draw? you'll need roughly 1:1 magnification to get the framing you want, so a lens with a focal length that's half your max bellows draw will be your best bet.
that tent is a pop-up tent. lots of them out there, i just picked that link because i like the double zipper. there are also pop-up changing tents or portable showers that are basically the same...
promark has been buying up a lot of lighting gear brands. https://www.promarkbrands.com/our-brands/
https://menimal.co.uk/menimal-2-man-camouflage-pop-up-hunting-blind-shooting-sports-wild-photography/
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no, the lead is for absorbing stray x-rays instead of letting them potentially reflect off of something nearby and back onto the film. it's not involved at all in converting x-rays into visible light...
green sensitizing dyes aren't that specific and there's a limit to how much sensitivity you can shift to green, so there's not a huge difference. hru green is sensitive to everything from uv to...
you could make some little numbered plastic tabs that attach to the ends of the flap and cover the extra little bits of image area between the flap and the ends of the film slip. they get cropped out...
just convert your bellows extension to f-numbers. if you have a 140mm lens focused at a distance that adds 60mm of bellows extension, giving you an effective focal length of 200mm, that's f/1.4 to...
i think you're mixing up lead shielding and phosphor intensifying screens.
ebay, etsy, etc. all have ratings and reviews from buyers for that specific reason.
sounds like more of a "buying stuff from sketchy people who cut too many corners" problem than a 3d printing problem.
there's no reason to reverse the elements in a projection lens.
https://www.bizlinktech.com/products/detail/1075/TYPE+CW2751+%282-poleSafety+class+II%29
https://jolommencam.com/holders/
my pacemaker speed graphics were a little over $100 and $300 canadian, with the kit lenses. all my 4x5 film holders were $5 or $3. my enlarger was free though, so i guess technically they were more...
"the ground glass is the same thickness as the original fresnel. you can just flip it around and mount a new fresnel behind it."
the ground side of the ground glass is normally at the mid point...
the ground glass is the same thickness as the original fresnel. you can just flip it around and mount a new fresnel behind it.
those pacemaker lens boards look sturdier than some i've seen, but i'll stick with my own design. https://www.thingiverse.com/thing:5817139
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most standard triplet or tessar fixed focal length projection lenses should cover 4x5 at a 6"/150mm or longer focal length, depending on how much you care about fall-off. there are some planar...
there are literally tons of old 6" or 7" f/2.8 or 3.5 projection lenses out there for dirt cheap that would work just fine.
carnauba, hard and slippery.
just stick your digicam behind the shutter, take a photo through the open shutter at say 1/30s then a second photo in bulb mode while tripping the shutter at 1/30s.
buhl projector lenses. the 2.5 versions have gotten pricey and hard to find, but still a better deal than an aero ektar, and the slower versions are nice and cheap and even fit in a closed speed...
having the mirror between the lens and a horizontal focus screen forces you to use a fairly large mirror, and retrofocal lenses for wide angle shots, which aren't easy to find for 4x5. having a...
a crown? not a speed? *shakes head in judgemental disgust*
you had me at the start, but lost me with the 4x nonsense. it's just as lazy as using 3x. i noticed you calculated the vertical which is closer to 4x but skipped the horizontal which is closer to 3x....
they were talking about lenses that correct for chromatic aberration.
lens sunning, uv-c and all the other nonsense people buy into about fungus and photo gear.
rear nodal point and entrance pupil diameter, not lens center and aperture diameter. i just compare the lens' infinity focal length to whatever focal length it's currently extended to and think of...