Dez
Bodger Extraordinaire
I have two Summitars, a 526... (1939) and a 721... (1948). Both have the round aperture design.
Cheers,
Dez
Cheers,
Dez
Summitar Diaphram Blades
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#554xxx 1940, uncoated, round
#901xxx 1951, coated, hex
From Sartorious' book
#901xxx 1951, coated, hex
From Sartorious' book
raid
Dad Photographer
1950 model 817xxx hex design. Awesome. When used wide open (as Leica meant it to be used), the aperture shape and number play no role.
raid
Dad Photographer
I took today my Summitar with me for some snapshots with the Olympus E-P2.
raid
Dad Photographer
I used ISO 200.
Mr_Flibble
In Tabulas Argenteas Refero
The hexagonal design was introduced in the last few years of Summitar's production. Supposedly the hex-aperture reduces vignetting/light drop-off in the corners. (Or it was cheaper)....
I've personally never noticed this with my (pre-)wartime 10-bladed Summitars.
I've personally never noticed this with my (pre-)wartime 10-bladed Summitars.
raid
Dad Photographer
I use the Summitar almost always wide open, so there is no observable difference between the different model aperture designs.
davidnewtonguitars
Family Snaps
Raid, please could you write a little about your preference for wide open aperture shooting?
raid
Dad Photographer
When I was at Leica in Wetzlar this summer, Peter Karbe (Leica Top optical designer) gave our group a talk about tradition and innovation at Leica. He emphasized repeatedly during his 75 minute talk that "[you] must use Leica lenses wide open. They are designed for it." I use lenses wide open to be able to play better with the resulting out of focus in the background.
sepiareverb
genius and moron
Summitar #659580 Very round opening.
It is in Japan being painted.
It is in Japan being painted.
davidnewtonguitars
Family Snaps
raid
Dad Photographer
There are situations at which I have to close down the aperture due to strong light, and then I often use aperture 8-11.
