Re: [Leica] Jupiter 3 (1.5/50 ) review

[Dante Stella <dante@umich.edu>]

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Great review! Keep up the good work.


On Friday, October 6, 2000, at 10:39 AM, Stanislaw B.A. Stawowy wrote:


<italic>(As my contribution to group, I choosed to try to =
describe</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>some of Russian lenses and provide =
samples & info about</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>them. I know that this is not a pure =
"Leica" subject, but</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>because this is a *users* group, these =
informations may be</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>of some importance. There was some info =
about them in early</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>Digests, like these from 1998, but not =
all. I hope I will</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>see Marc Small someday, writing =
something like a series</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>of articles describing Russian lenses =
in LTM <<g>)</italic><color><param>0000,0000,0000</param>



<italic></italic></color><italic>                   #  Jupiter 3  =
#</italic><color><param>0000,0000,0000</param>


<italic></italic></color><italic>My example has serial number 6310911, =
what gives me some</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>reasons to suspect that this lens was =
made in 1963.</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>Glass is clean, with some light =
scratches on front, </italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>visible only when carefully looking at =
angle. Glass</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>is coated on all air-glass surfaces. =
Colour of coating</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>is deep blue. On front element coating =
is less visible.</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>Dimensions are (without mount, set at =
infinity):</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>Length: 36 mm =
</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>Diameter: 46,5 mm in widest place =
</italic><color><param>0000,0000,0000</param>


<italic></italic></color><italic>Filter mound diameter is 40,5 mm =
</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>Distance scale is from 1 to infinity =
</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>Diaphragm goes from 1.5 to 22 w/o =
stops</italic><color><param>0000,0000,0000</param>


<italic></italic></color><italic>Internally, this lens is made of seven =
elements in three</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>groups (correct me if I am wrong). =
Front element is a</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>strongly curved planoconvex (good =
word?) single lens.</italic><color><param>0000,0000,0000</param>


<italic></italic></color><italic>When I first time saw this lens, I =
suspected that such</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>a desigh would result in strong =
residual chromatic =
aberration</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>and strong coma. To my surprise, I was =
wrong.</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>Lens has some 14 or so diaphragm =
blades, that high a number</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>results in very pleasant apperance of =
out of focus areas,</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>also in-focus things are not harsh, =
like in Nikon glass,</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>but softer (did anyone noticed this =
harshness of Nikon </italic><color><param>0000,0000,0000</param>

=
<italic></italic></color><italic>lenses?)</italic><color><param>0000,0000,=
0000</param>

<italic></italic></color><italic>Speaking about softness: this does not =
mean that this lens</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>is a dog; look below at =
test.</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>Test was made in Optics division of =
catedra of Physics</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>at Pedagogical University of Krakow, =
using a Zeiss optical</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>bed and measuring devices (micrometers =
and range meter). </italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>Film used in test was Agfa APX 25 =
(discontinued, sigh!),</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>developed then in Agfa Rodinal 1+25, =
fixed in FOMA RapidFixer,</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>then tested under Zeiss microscope at =
50-200x ,magnification.</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>Test target was a set of USAF test =
charts, places in center </italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>and five corners of 60x90 cm rectangle. =
Test charts were</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>printed at 2400 =
dpi.</italic><color><param>0000,0000,0000</param>


<italic></italic></color><italic>Results are: =
</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>This lens performs adequately at f/1.5 =
to f/2. There is</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>noticeable softness, especially at =
f/1.5, but center =
resolution</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>is about 55 lpm and corner 38 lpmm. =
After that, there is strong</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>resolution gross, which peaks at f/4 to =
f/5.6 (103 lpmm center,</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>92 lpmm corner) and slightly diminishes =
after f/8. At f/11 to</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>f/16 resolution is still well above 70 =
lpmm in center. At f/22</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>resolution diminishes to that at =
f/2.</italic><color><param>0000,0000,0000</param>


<italic></italic></color><italic>Some non-scientifical =
results:</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>I am a nocturnal shooter. This is a =
kind of ugly person,</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>so ugly that travels in the night, and =
stupid, so stupid</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>that is on these dark, dangerous =
streets alone <<g></italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>I am using this Russian lens very =
extensively. Main reason is</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>that this lens almost lacks flare, so =
street lights seems</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>"as real". Also, when fogs from bright =
light source, this lens </italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>does so only in a close surrounding of =
it, so very bright </italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>streetlight fogs only half of his =
diameter around.</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>One peculiarity is that with aperture =
set at f/11 and below,</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>lights have "rays" coming outside, like =
these with "star"</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>filter. This is a very hard to spot =
behaviour, you have</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>to photograph very bright and very =
small streetlight, </italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>also you have to overexposure by 2-3 =
stops to see this.</italic><color><param>0000,0000,0000</param>


<italic></italic></color><italic>I will put some of photos taken with =
this lens on net</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>in next week. This will also give me a =
reason to make</italic><color><param>0000,0000,0000</param>

<italic></italic></color><italic>my own website at last =
:-)</italic><color><param>0000,0000,0000</param>


<italic></italic></color><italic>                                    St. =
               </italic><color><param>0000,0000,0000</param>


<italic></italic></color><italic>Ohh yes. And lens is =
silver.</italic><color><param>0000,0000,0000</param>