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By BlackDocin short:
Beginning of autumn
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By sandroDoes anyone know when the infrared marks on Leitz/Leica lenses were not used anymore? I am checking my own lenses:
Hektor 13,5 cm (1956): yes; Elmar 135 mm (1962): no
Elmar 9 cm (1937): yes; Elmar 9 cm (1952): yes; Elmar 9 cm collapsible (1954): yes; Elmar 90mm (1962, new version or II): no
Summicron 50mm II (1960): no; Summicron 50mm III (1968): no
Summitar 50mm (1948): yes
Summar 5 cm (1937): yes
Elmar 5 cm (1939): yes
None of my 3,5cm/35mm lenses has the R-mark
Best, Lex -
By MikeMyersI think this is an impossible question to ask, without someone seeing it in person, but back in the 1960's and 70's I accumulated a small collection of Leica gear, most of which went into storage when I got into digital. Then Leica came out with the M8 and M8.2, so I bought one as soon as I could afford it. When I read about the problem the camera had with infrared, for me that was a bonus - I wanted to take infrared photos, and now I had a chance. I did this back in 2009 and 2010, and then I mostly moved on to other things. I've now got a M10, and all my other gear is put away in drawers, but I again want to start taking infrared photos.
50 or so years ago I got what was supposed to be a Leica infrared filter that screws into my equally old 50mm Summicron. There are no markings on the filter, but I've been using it all this time. I know there are several filters I can buy nowadays, but my first question is whether anyone recognizes this as a Leica filter. Did Leica make several variations of this, or was this "it".
It's nice that I can take hand-held photos with the M8.2 using this filter.
A related question is about focusing. I read that on the 50mm Summicron, I need to focus normally, then take the distance mark on the lens and turn the focus adjustment such that this mark is now opposite the f/5.6 mark that's used for depth of field. (from here: https://www.photo.net/discuss/threads/why-no-ir-mark-on-summicron-50mm.162704/ )
I'm surprised there are no markings on the filter.
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By bcortonI wanted to see how well (or poorly) my TL2 could be coaxed into producing infrared or near-infrared photographs. So I started this informational topic to pass along some of what I found out.
I used infrared film only very occasionally during my predominantly film days, but there were times when it was just the ticket. One of my favorite B&W films was and still is Ilford's near-infrared SFX-200 processed in PMK Pyro, both for normal and occasionally for near-infrared photos (but that's another story).
It turns out that the TL2's sensor collects an impressive amount of infrared light. (Simple test: try viewing the business end of an IR TV remote through the camera. If you can see the IR diode--I assume it's a diode--light up when pressed, then you've got something to work with.) The TL2 shows the diode very well. So did the X2, but the X2 didn't fare nearly so well once I tried using it with IR filters. The exposure times were way too long.
Getting the TL2 converted to Infrared is an option, and one that will preserve exposure times we are more used to. Filters, as you all know, slow exposure times down. But if you only use IR occasionally, as I do, IR conversion of the camera isn't a desirable option. So I experimented with filters, and the results are as follows:
I used three filters on the TL2 in various types of scenes. The three filters were--in order of ascending visible light filtration--first, the B+W 092 (which Schneider says "...blocks visible light up to 650 nm, and at just below 700 nm it allows 50% to pass through .... From from 730nm to 2,000 nm the transmittance is very high at over 90%"). The second (perhaps the Goldilocks filter) was the HOYA R72 Infrared, which is designed to pass 95% of the light between 760nm and 860nm. The third, and darkest, filter was the B+W 093 which . . . well, I'll let them tell it: "blocks the entire visible light spectrum. It therefore appears black and in contrast to the B+W 092 infrared filter 695, it enables shots in pure infrared without the visible red. The transmittance does not exceed 1% until 800nm, but increases to 88% at 900nm."
I'll put results in subsequent posts.
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