Archived posting to the Leica Users Group, 2000/10/16

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Subject: Re: [Leica] Jupiter lens 'tests'
From: "Stanislaw B.A. Stawowy" <watteau@krakow.neurosoft.net>
Date: Mon, 16 Oct 2000 11:35:44 +0200

Hello!

Thank you for these tests. Indeed, Russian
lenses have very pleasant unsharphess (contradiction?)

Jupiter 3 have many aperture blades, this may make
good out-of-focus-lights reproduction (bokeh? 
Does anyone believe in bokeh? ), also design is
somewhat symmetrical - look at drawing of Sonnar 1.5/50,
this may help to make this design considerably rectilinear.
One more - Jupiter have only six air-to-glass surfaces.
If we add also that all surfaces are coated or multicoated
(true? Marc, help please..), we have a design which has
remarkable contrast and is resistant to flare. Even if 
flare appears, this is only one-two spot, even pleasant.
Bad point of this design is single, strongly curved front 
element, making Jupiter 3 prone to astigmatism. I haven't
tested Juipiter 3 for this, but, judging by my photos
( www.geocities.com/Stanislaw_Stawowy - I promise to add
more photos as fast as I will have some time - now I am
too much absorbed by working with Alastair on FOM2 website),
astignatism is minimal.

Please, whoever have something to add, write this.
I am currently looking for people' opinion about Russian
lenses and will finally put some compilation of this
on my website (of course asking for rights to publish first :-)

                                            St6.



                                St.
                     (Stanislaw B.A. Stawowy)

Replies: Reply from Dante A Stella <dante@umich.edu> (Re: [Leica] Jupiter lens 'tests')