Sigma 28-70mm f2.8 MF PKA mount

[ducdao]

Hi all - can anyone let me know anything about this lens? I searched the internet and can't find anything on it. Does it have the same optics as the AF series?

I just got it and took few test shots and so far I like it but would love to have more information on it. Can anyone shed some lights?

Note this is the Pentax PKA mount.




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Duc
Pentax K100D/K10D/K20D/K-x/K-7 | DA15/ 35/40/70 Limited | DA10-17 | DA14 | DA* 50-135
Takumar: 24/3.5 | 28/3.5 | 35/2 | 35/2.3 | 35/3.5 | 50/1.4 | 55/1.8 | 85/1.8 | 85/1.9 | 105f2.8 | 135/2.5 | 135/3.5 | 150/4 | 200/4 | 300/4
Pentax: K20/4 | M20/4 | M28/3.5 | K30/2.8 | K35/3.5 | M50/1.4 | M50/1.7 | K50/1.2 | K50/1.4 | K55/1.8 | A50/1.4 | M85/2 | M100/2.8 | K105/2.8 | M100/f4 | M135/3.5 | K135/2.5 | M150/4 | M200/4 | M300/4
M42: Too many to list
My PPG: PPG
My blog: Vietnam Trip
My Flickr: Sunny Skye

[ducdao]

No one has heard of this lens? It looks like it's a very rare lens. I can't find any information on it. Maybe I should try contacting Sigma. I'll report back if I have any news.
_________________
Duc
Pentax K100D/K10D/K20D/K-x/K-7 | DA15/ 35/40/70 Limited | DA10-17 | DA14 | DA* 50-135
Takumar: 24/3.5 | 28/3.5 | 35/2 | 35/2.3 | 35/3.5 | 50/1.4 | 55/1.8 | 85/1.8 | 85/1.9 | 105f2.8 | 135/2.5 | 135/3.5 | 150/4 | 200/4 | 300/4
Pentax: K20/4 | M20/4 | M28/3.5 | K30/2.8 | K35/3.5 | M50/1.4 | M50/1.7 | K50/1.2 | K50/1.4 | K55/1.8 | A50/1.4 | M85/2 | M100/2.8 | K105/2.8 | M100/f4 | M135/3.5 | K135/2.5 | M150/4 | M200/4 | M300/4
M42: Too many to list
My PPG: PPG
My blog: Vietnam Trip
My Flickr: Sunny Skye

[kuuan]

could it be that it is optically the same as the later AF lens?
at least here, the first reviewer seen is talking about his manual focus lens, others it seems mostly about their AF lens:
http://www.photographyreview.com/cat/lenses/35mm-zoom/sigma/28-70-f-2-8/prd_84685_3128crx.aspx
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for sale: preset Takumars: f2/58mm ( rare Sonnar ), f3.5/135mm, f3.5/200mm - Auto Takumars: f3.5/35mm, f2/55mm - Super Takumar: f3.5/135mm - S-M-C Takumar f3.5/28mm - Tamron Adaptall: f2.5/28mm - Jupiter-9 f2/85mm, Auto Yashinon f2/5cm, Kiron f2.8/28mm ( most lenses only can be sent October 2013 from Austria, some earlier from around Asia )
photos of and by manual lenses on Ricoh GXR M, Sony NEX5N, Pentax K-x and*istDs: http://www.flickr.com/photos/kuuan/collections/72157604973031858/

[hasan]

This page has some infos. German though, use google translate
http://www.pentax-fremdobjektive.de/wiki/index.php5?title=Sigma_MF_28-70mm_F2.8_Zoom_(Zen)


Regards
Hasan