Why are there so few "cheapo" 85mm lenses?

[atiratha]

They come under different names, if you dig a little, there was a thread about it, with photos. Not tack sharp wide open, rather plasticky build, but optically a Sonnar with all its virtues, after stopped down a little. Mostly P/K lens, some claim PKA. I don't remember if they come in other mounts.

Edit: Found the thread http://forum.mflenses.com/mitakon-mc-85mm-f2-made-in-china-t30160,highlight,%2Bmitakon.html
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Slew of M42 and PK lenses. Among my favourites Pentax K 50/1.2, Pancolar 80/1.8, Pentax K 135/2.5. Latest addition Soligor 180/3.5

[aoleg]

[pst]

[cheekygeek]

I've picked up two relatively cheap 85mm f1.8s in recent weeks.
First I got a Spiratone YS mount, with m42 adapter/t-mount. It has a M/A switch but slow/oily aperture blades.
Then I got a Tele Vivitar preset. It also has oily aperture blades, though that doesn't 't make much difference on a preset lens.
Haven't had time to shoot anything with them yet, but the info I've found in the web about them makes me very hopeful.
http://www.theautodolly.com/images/pair.jpg
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DSLR: Pentax K-5 II, D-BG4 grip, O-GPS1 SLR: Pentax SP500, Pentax SP, Pentax SP II, Pentax Spotmatic F, MX, ME-Super, Super Program, pZ-1
Lenses:
Tele-Takumar: 200mm f5.6; Macro-Takumar 50mm f4 (1:1)Super Takumars: 24mm f3.5, 55mm f2.0, 135mm f3.5; S-M-C Takumar 35mm f3.5, 50mm Macro f4.0 (1:2), 50mm f1.4, 135mm f2.5 (v2); Pentax SMC K 17mm f4 fisheye; Pentax-A: 50mm f1.4, 35-70mm f4; Pentacon: 50mm f1.8; Spiratone 85mm f1.8 (y/s); Vivitar: 85mm f1.8 preset; Carl Zeiss Jena Flektogon Electric 35mm f2,4

[pst]

@cheekygeek:

Interesting lenses! Maybe you can post some pictures when you have shot with the lenses.
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Regards, Patrick.