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C150 Vs MN61

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Posted by Al Misiuk on March 24, 2001 22:27:52 UTC

Hi Yarb,
A local shop, Captain's Nautical, lent a Celestron refractor for me to test a new interference filter I designed and made. The filter is meant to have very high transmission between blue-green and red (90-97%) and rapidly drop off at the violet-blue region (15%). This should remove that violet haze that is seen around bright objects when viewed through a conventional refractor.
The C150 has a number of followers. If any telescope would benefit from this filter the C150 is it. We coined such a telescope with such a filter as a pseudo-APO. Obviously it wouldn't be the equal to an APO, but would permit the use of higher magnification without the chromatic aberration becoming obstrusive. The tests will begin with the first clear night and while I'm at it I will do a comparison with my MN56 5 inch IntesMicro MakNewt. So far the MakNewt has been quite a surprise to me. It performs well beyond what I had expected.

Al Misiuk Seattle

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