Pentax-A SMC 28mm f/2.8 F2.8

Bob Sullivan rf.sullivan at
Sat Jul 10 18:28:56 EDT 2010

There are more A series lenses, but some are a little rare.
Pentax made a ton of M series lenses for the MX, ME, ME Super, etc.
The A series went with the Super Program and Program Plus cameras.
They are desirable as the apertures are the same as measured on the
latest cameras.
The A 28/2.8, A 50/1.7, A 50/1.4 are all pretty common on ebay and not
too pricey.
There are A 20/2.8, A*85/1.4, A 100/2.8, A 200/4, A*300/4, A 400/5.6.
They are nice lenses, but get more expensive.
Pentax lens history by series is M, A, F, FA, DFA, DA.
The M's and A's are manual focus.
The F's and FA's are the start of autofocus.
The DFA's and DA's are especially for the latest autofocus digitals.
(The DFA's and DA's lose the aperture ring and aperture is only
controled thru the camera.)
Regards,  Bob S.

On Sat, Jul 10, 2010 at 4:22 PM, Eric Weir <eeweir at> wrote:
> On Jul 10, 2010, at 5:04 PM, Godfrey DiGiorgi wrote:
>> They have the linear-action iris actuator and a special position on
>> the aperture ring allowing a Pentax body with on-body aperture control
>> (all the DSLRs) to set the aperture value using the body controls.
>> They're fully compatible with the DSLR bodies with respect to all
>> auto-exposure modes.
>> The SMC Pentax-A 28mm f/2.8 lens is a wonderful little lens. It's
>> small and light, slightly soft until stopped down to f/4 but has
>> wonderful bokeh. It was the first Pentax lens I used when I purchased
>> the *ist DS body in 2004.
> Hmm. Now it's sounding more interesting. I just purchased a *ist DS. May not be able to tell the difference between soft and sharp, but at this point would prefer sharp.
> Is this one in a series of lenses, i.e., are their Pentax-As o other focal lengths?
> ------------------------------------------------------------------------------------------
> Eric Weir
> Decatur, GA  USA
> eeweir at
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