Quote:
Originally Posted by gregbradley
Thanks very much for that article it was very interesting.
Greg.
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No worries. The other article I was thinking of is one called “The Perfect Telescope is...
https://www.televue.com/engine/TV3b_...=Advice&id=101
But plenty of good advice on eyepieces and telescopes here:
https://www.televue.com/engine/TV3b_page.asp?id=154
The article on Majesty factor describes contrast, exit pupil and field of view nicely with lots of good info there:
https://www.televue.com/engine/TV3b_...=Advice&id=114
The ultimate goal (for low power sweeping) is for a wide field with smaller exit pupil for better contrast (and less human eye noticeable astigmatism) but with a large field stop diameter to give a larger true field. The introduction of the 21mm Ethos was a big step toward that goal.
The field stop diameter of the 21E is 36.2mm, only 2.5mm less than the 35mm Panoptic. You get almost the same true field at nearly twice the power and half the exit pupil, (not quite 2:1 at 1.7:1 but you get the idea). Field of view for 540mm is 3.8 deg for 21E compared to 4.1 deg for 35P.
Tele Vue eyepiece specifications here:
https://www.televue.com/engine/TV3b_page.asp?id=214
Many an astrophotographer spends hundreds or thousands on a good camera because they can see the difference a better one makes and recommends such instruments on this and other forums. If your interest is not visual then it’s easy to not think the same way when it comes to choosing eyepieces.
I am enjoying reading about your venture into the visual world and the experience with different eyepieces. I’ve kind of been there, done that and am happy using an assortment of Clave, Brandon and Tele Vue.