How do these triplets stand up to a 20 year old Televue Genesis SDF for visual observations (planets, clusters, nebulas)? Is the Meade or Astro Tech consider an upgrade to the SDF?
TV Genesis SDF vs Astro-Tech 111EDT or Meade 6000 115mm Apo
Started by LMD527, 04/03/2014 04:23AM
Posted 04/03/2014 04:23AM
| Edited 04/03/2014 04:25AM
Opening Post
Posted 04/03/2014 08:30PM
#1
Luis,
This appears to be more of a trade-off than an upgrade. You'd be giving up the flat-field of the Petzval-design Genesis for a slight increase in aperture. Field curvature is quite evident in my TV-85 at low power while it wasn't apparent in a previously owned non-SDF Genesis. This is not an issue with planetary viewing but wide fields look better when everything is in focus.
- Tom
This appears to be more of a trade-off than an upgrade. You'd be giving up the flat-field of the Petzval-design Genesis for a slight increase in aperture. Field curvature is quite evident in my TV-85 at low power while it wasn't apparent in a previously owned non-SDF Genesis. This is not an issue with planetary viewing but wide fields look better when everything is in focus.
- Tom
Funding Member
