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Apertu geometric vs. real



 
 
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  #11  
Old January 6th 11, 12:06 PM posted to rec.photo.darkroom
Richard Knoppow
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Posts: 751
Default Apertu geometric vs. real


"Richard Knoppow" wrote in message
news

"Anton Shepelev" wrote in
message ...
Thanks to everybody for their replies.

Richard Knoppow:

I've posted instructions for autocollimating to

The whole thing snipped...
I have been writing _principle_ where I mean _principal_
as in principal point. I DO know the difference but
sometimes in casual writing I don't go back and check
things. Anyway, those of you who are pure grammarians (is
that a word?) can keep be comforted that there are still a
few of us who care about proper English.


--
--
Richard Knoppow
Los Angeles, CA, USA



  #12  
Old January 6th 11, 05:00 PM posted to rec.photo.darkroom
Howard Lester[_3_]
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Posts: 24
Default Apertu geometric vs. real

"Richard Knoppow" wrote

I have been writing _principle_ where I mean _principal_
as in principal point. I DO know the difference but
sometimes in casual writing I don't go back and check
things. Anyway, those of you who are pure grammarians (is
that a word?) can keep be comforted that there are still a
few of us who care about proper English.


YESSSSSSSSSSSSSSS!!!!!!!!!
  #13  
Old January 6th 11, 11:19 PM posted to rec.photo.darkroom
Anton Shepelev[_3_]
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Posts: 4
Default Apertu geometric vs. real

Richard Knoppow:

Its pretty easy to set a lens for its exact infin-
ity focus by autocollimating
[...]


Thanks for sharing! I am reading all your posts with
invariable interest. I used to check the infinity
focus of 'normal' lenses using actual long dis-
tances, which I had to do on dark evenings in my
house's backyard with my father at the camera oper-
ating the focus ring and me some eight meters away
shouting to him: "Just half a degree back!"... It's
gonna be easier now.

Anton

  #14  
Old January 7th 11, 09:22 AM posted to rec.photo.darkroom
Richard Knoppow
external usenet poster
 
Posts: 751
Default Apertu geometric vs. real


"Anton Shepelev" wrote in
message ...
Richard Knoppow:

Its pretty easy to set a lens for its exact infin-
ity focus by autocollimating
[...]


Thanks for sharing! I am reading all your posts with
invariable interest. I used to check the infinity
focus of 'normal' lenses using actual long dis-
tances, which I had to do on dark evenings in my
house's backyard with my father at the camera oper-
ating the focus ring and me some eight meters away
shouting to him: "Just half a degree back!"... It's
gonna be easier now.

Anton

Oh yes, actual infinity:-)


--
--
Richard Knoppow
Los Angeles, CA, USA



  #15  
Old January 19th 11, 10:17 PM posted to rec.photo.darkroom
Anton Shepelev[_3_]
external usenet poster
 
Posts: 4
Default Apertu geometric vs. real

Richard Knoppow said:

Oh yes, actual infinity:-)


Oooops. That was a mental error. Take 16 meters.

--
Anton


 




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