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lumens pixel
Joined: 27 Feb 2019
Posts: 887
Expire: 2021-06-25
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 Posted: Sun Mar 20, 2022 10:00 pm Post subject: Minolta MDIII 1,4/50 meets Magnolia |
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lumens pixel wrote:
Wide open...
[img] Magnolia bloom and bokeh by lumens pixel, sur Flickr[/img]
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Lumens Pixel
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Minolta SR mount: 16 2,8; Sigma SuperWide 24 2,8; 28 2,5; 28 2,8; 28 3,5; 35 2,8; 45 2,0; 50 1,4; 50 1,7; 50 2,0; 58 1,4; 85 2,0; 100 2,5; 100 4 Macro; 135 3,5; 135 2,8; 200 4; RF 250 5,6; 24-35 3,5; 35-70 3,5; 75-150 4; 70-210 4
Canon FD mount: Tokina RMC 17 3,5; 28 2,8; 35 2,8; 50 1,8; 50 3,5 Macro; 55 1,2; 135 3,5; 135 2,5; 200 4,0; 300 5,6; 28-55 3,5 4,5; Tokina SZ-X SD 270; 70-150 4,5; 70-210 f4; 80-200 4L; Tokina SZ-X 845
Tamron Adaptall: 28-80 3,5-4,2 (27A); 70-210 3,8-4 (46A); 60-300 (23A); 90 2,5 (52B); 35-135 3,5-4,5 (40A)
Tamron SP: 20-40 2,7-3,5 (266D) |
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55
Joined: 13 May 2013
Posts: 717
Location: U.S.
Expire: 2022-06-15
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| Posted: Mon Mar 21, 2022 6:42 am Post subject: Re: Minolta MDIII 1,4/50 meets Magnolia |
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55 wrote:
Magnificent. 
There's a Magnolia tree in our neighborhood which is just starting to blossom. Oh..! The sheer beauty of it is just awe inspiring. |
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RokkorDoctor
Joined: 27 Nov 2021
Posts: 1432
Location: Kent, UK
Expire: 2025-05-01
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| Posted: Mon Mar 21, 2022 11:09 am Post subject: |
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RokkorDoctor wrote:
I'm never too convinced about the wide-open bokeh of most lenses; I tend to stop down one stop, or even half a stop, literally to take the edge off it 
Having said that, subjects like the above make for very challenging bokeh conditions.
What puzzles me is why often lenses have been corrected for aberrations such that, when shot wide-open, their background bokeh looks a little busy, but their foreground bokeh is smoother. The other way around would seem more useful. Maybe there is a technical reason as to why that would be difficult to do.
_________________
Mark
SONY A7S, A7RII + dust-sealed modded Novoflex/Fotodiox/Rayqual MD-NEX adapters
Minolta SR-1, SRT-101/303, XD7/XD11, XGM, X700
Bronica SQAi
Ricoh GX100
Minolta majority of all Rokkor SR/AR/MC/MD models made
Sigma 14mm/3.5 for SR mount
Tamron SP 60B 300mm/2.8 (Adaptall)
Samyang T-S 24mm/3.5 (Nikon mount, DIY converted to SR mount)
Schneider-Kreuznach PC-Super-Angulon 28mm/2.8 (SR mount)
Bronica PS 35/40/50/65/80/110/135/150/180/200/250mm |
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lumens pixel
Joined: 27 Feb 2019
Posts: 887
Expire: 2021-06-25
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| Posted: Mon Mar 21, 2022 11:55 am Post subject: |
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lumens pixel wrote:
True that one stop would blur a little bit the edges. As to the technicalities I am clueless... but interested.
_________________
Lumens Pixel
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Minolta SR mount: 16 2,8; Sigma SuperWide 24 2,8; 28 2,5; 28 2,8; 28 3,5; 35 2,8; 45 2,0; 50 1,4; 50 1,7; 50 2,0; 58 1,4; 85 2,0; 100 2,5; 100 4 Macro; 135 3,5; 135 2,8; 200 4; RF 250 5,6; 24-35 3,5; 35-70 3,5; 75-150 4; 70-210 4
Canon FD mount: Tokina RMC 17 3,5; 28 2,8; 35 2,8; 50 1,8; 50 3,5 Macro; 55 1,2; 135 3,5; 135 2,5; 200 4,0; 300 5,6; 28-55 3,5 4,5; Tokina SZ-X SD 270; 70-150 4,5; 70-210 f4; 80-200 4L; Tokina SZ-X 845
Tamron Adaptall: 28-80 3,5-4,2 (27A); 70-210 3,8-4 (46A); 60-300 (23A); 90 2,5 (52B); 35-135 3,5-4,5 (40A)
Tamron SP: 20-40 2,7-3,5 (266D) |
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RokkorDoctor
Joined: 27 Nov 2021
Posts: 1432
Location: Kent, UK
Expire: 2025-05-01
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| Posted: Mon Mar 21, 2022 12:25 pm Post subject: |
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RokkorDoctor wrote:
| lumens pixel wrote: |
| True that one stop would blur a little bit the edges. As to the technicalities I am clueless... but interested. |
I've seen mentioned several times in the past that it has something to do with a design choice of either under-correcting or over-correcting for spherical aberration, and how that affects background and foreground bokeh. The consensus seems to be that over-correction will give outlining on background bokeh but smooth foreground bokeh, under-correction would give smooth background bokeh but outlining in the foreground bokeh. But this may be a myth/incorrect; I'm not an optics design expert.
Delving into my lens design books (as far as I can understand them ), it looks like that may not be a simple design decision as it also depends on subject distance and foreground / background separation distances.
_________________
Mark
SONY A7S, A7RII + dust-sealed modded Novoflex/Fotodiox/Rayqual MD-NEX adapters
Minolta SR-1, SRT-101/303, XD7/XD11, XGM, X700
Bronica SQAi
Ricoh GX100
Minolta majority of all Rokkor SR/AR/MC/MD models made
Sigma 14mm/3.5 for SR mount
Tamron SP 60B 300mm/2.8 (Adaptall)
Samyang T-S 24mm/3.5 (Nikon mount, DIY converted to SR mount)
Schneider-Kreuznach PC-Super-Angulon 28mm/2.8 (SR mount)
Bronica PS 35/40/50/65/80/110/135/150/180/200/250mm |
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