shame on me - I completely spaced-off my end of the month review...
Mamiya Macro Sekor 60mm f2.8, January 2019
What a lens - this is a lens I've been interested in since I began working with M42 lenses (not too long ago) - it gets rave reviews everywhere I've read, so I kept an eye out for one in a price-range I could swallow and waited..... finally, a BIN on eBay turned up (for less than $200) and I bought it...
all metal and glass, so it is definitely a substantial lens on the front of the K-5 IIs, but not any more so than any other film-era macro... it natively produces a true 1:1 macro, without any adapters, is a preset-M42 mount, and you can usually find it in one of two flavors: Mamiya or Yashinon Tomioka; this is also a Tomioka-designed lens... six-bladed iris that will produce hexa-bokeh, etc...
this lens renders colors beautifully, creates smooth/creamy bokeh (except with specular highlights), and is a joy to use.... the lens does not, however, like strong light sources pointed down the barrel - you'll get flare of all sorts and loss of contrast...
take a look:
definitely worth a look if you are into M42 lenses or even a film-shooter with an older camera body...
the rest of the month with the 60/2.8:
Single In Challenge - January 2019 | Flickr