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Post by mikey cee on Sept 19, 2016 21:37:42 GMT -5
It is stated that the 10" f/11's average strehl is .92. I'm confused is this "average" the same as polychromatic strehl? When testing in wavelengths of 436nm, 486nm, 546nm and 656nm is this the "average" that is quoted as being .92? Please explain.  Mike |
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Post by subarcsecond on Apr 11, 2021 16:56:22 GMT -5
Hi Mike my name is Jamie and I am from Nova Scotia, Canada. I am hopefully in the process of getting a 250 mm f/11-r30 to build a big refractor. I hear you have one of these and I was wondering if you feel this would be a good choice for double star work. Also I was wondering what your advice would be on a focuser.
Thanks for your time, Jamie
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Post by Ales - iStar Optical on Apr 20, 2021 21:42:13 GMT -5
It is stated that the 10" f/11's average Strehl is .92. I'm confused is this "average" the same as polychromatic Strehl? When testing in wavelengths of 436nm, 486nm, 546nm, and 656nm is this the "average" that is quoted as being .92? Please explain. Mike Mike, we used to list average values in green (monochromatic), meaning the range was from 0.90 to 0.94, thus 0.92 "average". But since those times we now list "minimum Strehl value" that we are able to produce (after making changes in production). So for example our new line of APOs has a minimum Strehl of 0.90. If we listed "average" it would be in 0.95 range. |
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Mike 
