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 Re: "Admirable" blur samples | |
Jonas B wrote:
This is a try to collect opinions on bokeh of all sorts (and also a try to save the Sigma 50 -thread from getting carried away). When I say bokeh of all sorts I mean it...
OK! Here\'s mine then:
These are all produced with the Knoica Minolta GT lens. I believe it\'s an achromat consisting of 16 elements in 13 groups, including two AD (anomalous dispersion) glass elements and two aspheric surfaces. It might actually classify as an Apochromatic design but I don\'t know the materials used (kind of glass) for the two AD elements so I guess I better not jump. It\'s 7.2mm ~ 50.8mm (f/2.3 ~ f3.2) which on a 2/3\" sensor is the 35mm equivalent of 28mm ~ 200mm. It has a macro switch that can be positioned when at either end of it\'s focal length so there\' a 160 ~ 200 zoomable macro at the top end and a fixed 28mm macro at the bottom end.
It\'s probably not important to this discussion but since the lens is not user replaceable it might be interesting to note that the auto-focus system is a \"Video AF system,\" which uses phase-detection focusing technology rather than the much more common contrast-detection. This makes focus tracking with the system very very nice and speeds up AF in general. With this system the camera not only determines whether or not the lens is in focus, but also how far out of focus it is, and in which direction (near or far).
Subject Distances as specified (below) are measured from the sensor surface plane.
01. EXIF: Macro, 1/15s f/3.5 ISO64 43.7mm (35mm eq:171mm), Subject Distance: 0.58 m
02. EXIF: Macro, 1/2s f/3.5 ISO64 50.8mm (35mm eq:200mm), Subject Distance: 0.30 m
03. EXIF not macro, 1/125s f/4.5 ISO64 46.96mm (35mm eq:184mm), Subject Distance: 2.40 m
04. EXIF not macro, 0.8s f/5.6 ISO64 25.79mm (35mm eq:101mm), Subject Distance: 0.50 m
05. EXIF Macro, 1/125s f/3.5 ISO64 46.53mm (35mm eq:182mm), Subject Distance: 0.30 m
06. EXIF Macro, 1/200s f/3.5 ISO64 43.7mm (35mm eq:171mm), Subject Distance: 0.50 m
07. EXIF Macro, 1/80s f/4.0 ISO64 50.8mm (35mm eq:200mm), Subject Distance: 0.36 m
08. EXIF Macro, 1/30s f/3.5 ISO64 50.8mm (35mm eq:200mm), Subject Distance: Not retained.
09. EXIF Macro, 1/20s f/3.5 ISO64 43.96mm (35mm eq:172mm), Subject Distance: 0.50 m
10. EXIF Macro, 1/13s f/3.5 ISO64 50.8mm (35mm eq:200mm), Subject Distance: 0.40 m
11. EXIF Macro, 1/15s f/3.5 ISO64 50.8mm (35mm eq:200mm), Subject Distance: 0.46 m
12. EXIF Macro, 1/320s f/3.5 ISO64 43.44mm (35mm eq:170mm), Subject Distance: 0.32 m
13. EXIF Macro, 1/10s f/3.5 ISO64 42.12mm (35mm eq:165mm), Subject Distance: 0.40 m
Act cleaned up. 
I believe you can only get this lens by purchasing one of the cameras (DiMAGE 7D, A1, A2, and A200) built around it by the now defunct (out of the camera business) Minolta or Konica/Minolta companies. I think the A200 is still selling for about $450 (new) and all the others should be obtainable for under $200. 
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