Cadmium Posted November 25, 2020 Share Posted November 25, 2020 Asahi Pentax Ultra-Achromatic-Takumar 300mm f5.6 I saw this on eBay, a bit expensive, and I think Jonathan said those aren't the best for some reason, I forgethttps://www.ebay.com/itm/353291263579?ul_noapp=true Link to comment
JMC Posted November 25, 2020 Share Posted November 25, 2020 Yes I saw that one too. Very over priced, so good luck to them. They are optimised for Vis and IR, not UV like the 85mm one. I seem to recall they have glass element(s) rather than just quartz and calcium fluoride. Link to comment
Cadmium Posted November 25, 2020 Author Share Posted November 25, 2020 Jonathan, Yeah, thanks. Link to comment
dabateman Posted November 25, 2020 Share Posted November 25, 2020 Yes just a slow IR lens. One was up for $2000 just a couple months ago. This one is a bit much. Link to comment
Andrea B. Posted November 25, 2020 Share Posted November 25, 2020 Given that IR photos can be made with so many non-specialized lenses, this 300/5.6 UAT is simply a Pentax collector's item, IMHO. BTW, I saw a lot of 35/3.5 lenses on Ebay recently. Nothing too special though, mostly in the Lentar, Telesar, Kaligar type brands. Also saw a 35/3.5 Spiratone enlarger. I have one and like it. (Adapters are always needed for enlarger lenses so that could be an additional expense for some.) Link to comment
Andy Perrin Posted November 25, 2020 Share Posted November 25, 2020 BTW, I saw a lot of 35/3.5 lenses on Ebay recently. Nothing too special though, mostly in the Lentar, Telesar, Kaligar type brands. Also saw a 35/3.5 Spiratone enlarger. I have one and like it. (Adapters are always needed for enlarger lenses so that could be an additional expense for some.)Hmmm. I inherited many lenses from my grandma and I think I saw one of those in the mix. What kind of adapter is needed for a Sony? Link to comment
eye4invisible Posted November 26, 2020 Share Posted November 26, 2020 Hmmm. I inherited many lenses from my grandma and I think I saw one of those in the mix. What kind of adapter is needed for a Sony?Enlargers have no helicoid, so all that is normally required for a Sony is an M42 helicoid and slim M42-NEX adaptor ring. Some enlargers are in M39 mount, so an M39-M42 ring is required in those instances. Link to comment
Alaun Posted November 26, 2020 Share Posted November 26, 2020 Actually it has also some fluorite elements and is not bad for UVmalva Link to comment
JMC Posted November 26, 2020 Share Posted November 26, 2020 Yes, the 300mm 5.6 had 2 fluorite and 3 glass elements (just checked the manual). It was designed to be a vis-IR unlike the 85mm one. The manual quotes it as being optimised for use between 400 and 800nm. Not hugely surprised it can be used in the UV, but that wasn't what it was designed for. Link to comment
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