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#11
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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
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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
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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
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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
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Apertu geometric vs. real
Richard Knoppow said:
Oh yes, actual infinity:-) Oooops. That was a mental error. Take 16 meters. -- Anton |
#16
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Apertu geometric vs. real
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