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ATM Evered Kreimer
The articles by Kreimer,on his 4 by 5 cold camera and guiding head appear
in the Observers section of S&T Dec. 1965 pp384 and Aug. '66 pp106 (which
has a good photo of his guiding head.He used a microscope head guiding at
1200X,with the guide star behind a tiny metal disc cemented onto the
cross hairs.The edge of the field was used,as he states the mirror's off
axis coma produced seagull star images.
Hopes this helps Jack.
Ric
Toronto