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Does 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
I 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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