I have used the the Pentax A100/2.8 Macro the most shooting film.
Some time ago Mark Cassino convinced me to upgrade to the DFA100/2.8.
Both work fine on the K-5 and manual focusing is no problem w/ Macros.
Most every macro lens is very good.
The manual focus old ones for film should be cheapest.
The Pentax K100/4.0 Macro might be cheapest.
Regards,  Bob S.

On Sat, Dec 1, 2012 at 10:39 AM, George Sinos <[email protected]> wrote:
> I agree with Tom C.
>
> I don't shoot macro a lot so I chose the 100 f2.8 for a couple of
> reasons.  It's a decent lens, of course, but the 100mm focal length on
> the crop sensor body lets me have a decent working distance between
> the camera and the subject.  If you're going to do anything with
> supplemental lighting you need a bit of space that you won't have with
> a shorter focal length.
>
> It's also a good lens for general shooting when you want to use a
> longer focal length.  I grew up with photography in the years when
> zooms were not so good, and the combination of a 35mm, 50mm, and 135mm
> lens was fairly common.  The 100mm macro on the crop body has an angle
> of view that is just slightly tighter, but similar to my old 135mm
> lens.
>
> Here's an old post of a shot made with the 100 f/2.8.
>
> <http://georges.posterous.com/blooming-at-sunrise#!/>
>
> gs
>
> George Sinos
> --------------------
> [email protected]
> www.georgesphotos.net
> plus.georgesinos.com
>
>
> On Sat, Dec 1, 2012 at 10:27 AM, Tom C <[email protected]> wrote:
>> I've experience with only the FA 100/2.8  macro.
>>
>> It's not a pretty beast, but I've always thought it delivered great results. 
>> Used they seem to be going for $350 -$500.
>>
>> In my mind, the advantages of a 100mm is you can be twice as far from your 
>> subject and still get the desired framing. Also the relatively large 
>> aperture is nice. It doubles as a sharp mid-range telephoto or portrait lens.
>>
>> There's one described as like new on eBay. Bidding is currently at $264. 
>> Several others also. I found my copy at a used lens counter.
>>
>> Few shots:
>>
>> http://photo.net/photodb/photo?photo_id=13295397
>>
>> http://photo.net/photodb/photo?photo_id=6502297
>>
>> http://photo.net/photodb/photo?photo_id=6502298
>>
>> http://photo.net/photodb/photo?photo_id=6502295
>>
>> http://photo.net/photodb/photo?photo_id=6502293
>>
>> http://photo.net/photodb/photo?photo_id=6468680
>>
>> http://photo.net/photodb/photo?photo_id=4042765
>>
>> http://photo.net/photodb/photo?photo_id=5092852
>>
>> http://photo.net/photodb/photo?photo_id=4912137
>>
>> Tom C.
>>
>>
>>
>>>
>>>I want a versatile macro lens for my K-r, that would be suitable when
>>>eventually I upgrade to a K-5 series or whatever comes along.  Without
>>>getting too exotic or pricey, I would like fairly wide max aperture
>>>and good bokeh.  I would use it mostly to shoot flowers, butterflies
>>>and the like.  If it could take decent images outside the macro range
>>>as well, that would be a plus.
>>>
>>>What are others using?  What moderately price lens would you recommend>
>>>
>>>TIA, Dan
>>>
>>>Dan Matyola
>>
>> --
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>>
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