"Edward" wrote in message news:%6Qxc.19908

The TMB's by all accounts are first rate if you can tolerate the narrow FOV.

Ed T.

Hi Ed,

Note, please, that SPL eyepieces also have about 1.5x longer eye
relief in the case 42 degree vs 30 degree. If only 30 dgree field
in use, SPL eyepieces have at least 2x longer eye relief.
Needless to say, that comfortable eye relief is one of the most
important factor for strainless observing of planets. When eye works
in comfortable conditions, without strain, it will see MORE, then in
the case of strain due to short eyerelief.
Long eyerelief and small number of lenses and excellent field correction
was three decided factors to choose present in SPLs design vs any another.
We also spent a lot of efforts to develop a new coatings to maintain
reflections at less than 0.1% level for eye lens and about 0.12%-0.15% for
lesser important field lens.


Valery Deryuzhin.