FreeLists / az-observing / [AZ-Observing] Re: Report on the Televue Diagonal

[Stan Gorodenski <stanlep@xxxxxxxxxxxxx>]

Brian Skiff wrote:

>     The difference in nominal reflectivity is only 10-15% at most,
>which without having some sort of blinking arrangement, you simply
>aren't going to see visually, particularly at low power (the 35mm
>eyepiece you mention).  The eye really sucks when dealing with
>brightness differences.  Where the newer types of coating ought to
>help is with increased contrast
>

I thought I had seen this on M42 with the Televue. I could not be sure. 
I don't have a blinking arrangement and it is difficult to remember what 
one sees after having to spend the time to switch diagonals, switch the 
eyepiece, and refocus.

>---less scattered light, which should
>be noticeable in crowded fields, being able to see stuff better   
>on planets etc, all at high power.
>

Okay. It looks like I made the wrong test for the coatings. It appears I 
should be using higher magnification eyepieces to test them out.
Stan
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