Thread: An EP Role Call
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  #19  
Old 12-03-2021, 07:13 PM
astro744
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Join Date: Apr 2007
Posts: 1,244
Do not dismiss low power viewing just because larger exit pupils bring out the worst in ones eyes. Either use long eye relief eyepieces and wear glasses when observing or get the Tele Vue Dioptrx (available in various strengths).

Generally pick the magnification that best frames the target but for general sweeping of the night sky nothing beats low power on a 4” flat field Nagler-Petzval (except maybe a 5” Nagler-Petzval). Either of these telescopes are wonderful for low powers with either a 41mm Panoptic to maximise true field or a 31 mm Nagler for a bit more apparent field but a little less true field. The Tele Vue NP telescope have a fiat field so you don’t have to worry about curvature of field provided you use highly corrected eyepiece that Tele Vue has to offer. There may be other eyepieces that work well with such telescopes.

Also any short refractor can be used for low power sweeping and depending on focal length and eyepiece used you will see some curvature of field and most of the time it’s not too detrimental but certainty telescope/eyepiece combinations will work well and others not so well. Dark skies are recommended for low power viewing to maintain contrast.

See the article (extract) on the joys of low power viewing at:
https://www.televue.com/engine/TV3b_...=Advice&id=164

If you can source “The Best of Amateur Telescope Making Journal, Volume 1, Willmann-Bell publisher, it has the full article as well as many others. Volume 2 is highly recommended too.

Last edited by astro744; 14-03-2021 at 02:24 PM. Reason: Corrected typo; Petzval not Petzal
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