A review of the 20mm ES68, 20mm Pentax XW, and 20mm Waterproof Meade UWA
The eyepiece market provides numerous options with a 20mm focal length ranging from inexpensive 20mm plossls to expensive “premium” options offered by Pentax and Televue. Eyepieces with a 20mm FL are very versatile giving exit pupils ranging from 4.4mm to 2.0mm with scopes having focal ratios from F/4.5 to F/10...
This is article is available to subscribed members only.
Funding Member
Sponsors
- AstroMart LLC
- Desert Sky Astro Products
- FocusKnobs
- Pier-Tech Inc.
- GetLeadsFast, LLC
- Takahashi
- Anacortes Telescope
- ADM
- AstroMart
- Optique Unterlinden (Europe)
- Gemini Telescope Design
- Matsumoto Company
- Anacortes Telescope
- APM-Telescopes
- SkyShed Observatories
- RoboScopes
- Astromart Customer Service
- TeleVue Optics
- Rod Mollise
- Mathis Instruments
View all sponsors