murrayatuptown
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Everything posted by murrayatuptown
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on Pentax Q7©
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on Pentax Q7©
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on Pentax Q7©
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on Pentax Q7©
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on Pentax Q7©
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on Pentax Q7©
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on Pentax Q7©
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on Pentax Q7©
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on Pentax Q7©
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I have the remains of one of those lenses...kind of a walnut-burgundy anodized color...attractive. Luckily I only paid $5 + postage (2004 postage according to a question I posted about it). Heavy amber surface coating (not yellow glass) on the front & rear elements. Focus was 1" behind the lens (4" diameter end). The 'front' was about 5" diameter. Since it was a sort of projection lens, it was awkward. Reversed, with the aperture ring on the back it was a few inches. Mine had bad 'front' surface damage. I wrestled the retaining ring out and couldn't get the lens out...very tight fit...hair dryer trick (heat until it expands enough for the element to fall out...with a vacuum sound. Back focus increased to several inches. Heavily colored images...I concluded monochromatic...also based on the original application. Declared useless, I attempted disassembly---too massive to use hairdryer on inner elements...I took a hacksaw to it and eventually got one half to unscrew. Nice iris (19 blade?) . Had to press elements out the fit was so tight. The two on either side of the iris were very thick, semi-hemispherical but negative diopter value. Still useless even disassembled. Tried to put it back together & chipped one of the semi-hemi elements. I don't know how many elements are in it right now but I kind of like the look of lightbulbs projected onto a groundglass...so I may yet figure out a way to mount it onto something.
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Thank you!
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I just acquired a view camera and in the case were some open and unopened 20-packs of Polaroid film...all the boxes I looked at had 1993 expiration dates. I gave up experimenting with 2001 expired Type 59 & got rid of it - the color shift was fun initially, but when less than half the sheet was developed, it was too dried out. Type 55 if too dry, one can process in wet chemistry (treat like it’s ISO Pan X, IIRC...plus aging). There was a pack of Polaroid P100D E6 Chrome film in there, open but all 20 in there...like someone was preparing & changed their mind... I assume the Polaroid paper sleeves are less airtight than plastic packaging roll film comes in, and the shelf life probably more questionable. Anyone ever use it & know if it was a Polaroid recipe or packaged by someone else for Polaroid? Odd size negative vs. std. 4x5 film? Basement temperature, not refrigerated...this may be a curiosity more than anything. Thanks Murray
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Hmmm, the presence of the ground glass reduces options for projection device origin.
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Both good answers. Thanks. Intent was to put it on my first Franken-Cam (film) started years ago, derailed by errors, sidelined by Franken-Cam II-VI (digital-just microphone hacks). I forgot about Epi-whoever..I bought one for the lens and took the rusty metal housing etc. to the dumpster so quickly I don’t remember much about its mechanics other than the doghouse-like appearance...well, doghouse with a cyclops in it.
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Fooled the .png censor...edit on phone saves as jpeg.
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Hey Ron & Dan... I will take pictures. I had .png images I couldn’t upload...first I thought because they were not mine (from eBay listing), but probably because they were png. The thing arrived...it must be for a non-portable camera...I could hardly hold it up with one hand...steel & aluminum plates...speaking of reducing, that’s literally what I did to it...removed the oversized baseplate and non-essential plates. Now it will fit the camera I hoped to fit it on. I will also steal the idea to make a lighter one of wood construction. What remains is still partially angle iron!
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A ‘walk-in’ camera obscura room has the same phenomenon of a 3D image plane, as the ‘end-illuminated’ cylinder pinhole camera l described. Even with lenses (4000 mm, f/100 and f/27), viewers inside the room enjoyed the view because the subject was more than a flat field...very 3D, like most photography... it was more like transient video as no images were captured.
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Hello I had to create a new account...so I have to wait for account approval of uploaded images. I’m trying to identify a just-purchased unidentified 5x7 rotating spring back with ground glass and a tilting cover that has a reflex mirror BEHIND the GG, between the GG and tilting cover. It is very simple but every feature is functional. It is huge, making me wonder if it was a reducing back for a larger camera or for a commercial copy/process camera...maybe one that operated vertically...that might make the ground glass viewer mirror useful. The filmholder is created from steel angle stock, the cover with mirror is also steel, and the rest is 1/8” aluminum plate. The rotation is accomplished via 4 rounded corners on a squareish footprint. Since I don’t have the camera I’m not sure whether it actually rotates or is removable to reinsert rotated 90 degrees. There are two half-circle ‘locking knobs’ that would engage the lip of a tab above a recessed cavity the back would sit inside. All black wrinkletex paint, black felt light seal inside. The ground glass & mirror mounts and filmholder light trap plate are all implemented with simple aluminum strips...all additive features rather than grooves/slots removed. Possibly too simply functional to burden with the tag ‘primitive’. Thanks for reading & looking when the posted inaged are available, Thannk you Murray
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Flying ahead of an encroaching Florida hurricane
murrayatuptown posted a gallery image in Black and White
