Archive 2009 · G1 with CANON FL 58 1.2

dasrocket
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p.1 #1 · p.1 #1 · G1 with CANON FL 58 1.2

This was my first walk around with this combo, really trying to learn it for use on an upcomming trip. The G1 is a very nice camera, and required less getting used to than I expected.
The Lens, on the other hand, is a very "peculiar" piece of glass...In my opinion, a very capable lens for certain subjects and very unfitting to others. Overall, it has a distinct "glow" to it, much like the fast RF CANONS like the 50 1.2 serenar.

The first photo is of a parked car which, IMHO, makes for a good subject for this lens.

Next is a shot of a flower followed by the split channels of that single shot.
Here is the question to those using older fast glass: Do you also notice a distinct focus shift on the R,G,B channels or is this native to this lens? I don't remember other fast lenses I have used with such a pronounced effect.

Aug 17, 2009 at 04:57 PM

mawz
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p.1 #2 · p.1 #2 · G1 with CANON FL 58 1.2

I've seen distinct shifts in the blue channel from a Canon 50mm f1.5 LTM when shooting wider than f2. Blue channel shift is fairly common on truly old fast glass.

Aug 17, 2009 at 06:08 PM

theSuede
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p.1 #3 · p.1 #3 · G1 with CANON FL 58 1.2

Interesting.. :-) Nowadays manufacturers usually make fast glass have their largest focal shift between the red and the green channel... Usually the difference is around 2% focus distance towards the camera in green and 2% away from the camera in red - compared to the luminance average.

The following example is a fast modern 85 wide open MTF20lp/mm graph of the R, G and B channels, and average in Black. The horizontal axis is the focus distance, the vertical axis is the MTF20lp/mm contrast - higher is better.

Best focus is as indicated... 4.92m for green, 5.14 for red. One channel is focused very roughly 2% past the channel luminance average, one is roughly 2% before the channel luminance average. In archaic measures, that's roughly one inch per yard.
This is wide open, stopped down to F/5.6 this difference is "masked" by the deeper DoF so that the effect cannot be seen in the focused plane, but the green/red fringes in edges can still be seen in far/near OOF contrasts...

http://pici.se/pictures/yKsSRJwHb.gif

Aug 17, 2009 at 07:56 PM

justruss
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p.1 #4 · p.1 #4 · G1 with CANON FL 58 1.2

The 55mm version of this lens is supposed to be better.

Aug 18, 2009 at 08:25 AM


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