Reading this thread, it seems like every post deserves a LIKE.
What I like about refractors, mine in particular:
- They're reliable, they do what they do without fiddle or fuss. Whether it's the NP-101 or the 102mm F/5 Achromat, I can count of them to give me everything they've got.
- Refractors don't punch above their aperture. What they do, is perform at very near to the theoretical limits for their aperture and they do it consistently. For a given aperture, they're far and away the most efficient with light, a good ED/apo is a no compromise scope, no knockdown factors because of reflectivity or the shadow of the secondary.. The only limit is the aperture.
- I like the upright diagonal and the erect if not correct image.
- The versatility.., a good ED/apo refractor is not only an astronomical instrument, it's a terrestrial and birding tool.
Refractors are easy scopes.. if I have 45 minutes to observe, I am not taking out my 10 inch Dob..