> From what I have read, these are the Pentax-compatible superfast
> 135s arranged in descending order of optical quality:
> 1. Pentax SMC 135/1.8K (77mm filter)
> 2. Vivitar Series 1 135/2.3K and M42 (72mm filter)
> 3. Soligor 135/2 in M42 and K (72mm filter)
> and SigmaTel XQ 135/1.8 in T-mount, possibly M42 or K mount (77mm filter)
> 4. various older 135/1.8s that use an 82mm filter, including, I believe, the Porst,
>the Spiratone, and the non-XQ Sigma
> I own the Vivitar and it's everything I could want; it focuses to
> 0.9 or 1 meter.
Almost as fast as the Vivitar Series 1 135/2.3 (and more plentiful
and often less expensive), and a superb lens in its own right, is
the K 135/2.5 ("the poor man's A* 135/1.8").
[But ~not~ the "Takumar Bayonet" 135/"2.5" (which is probably an
f/2.8 lens in reality, and which is not in the same league as the K
135/2.5).]
Fred
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