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ES100 - maximizing FOV (1 Viewer)

DRodrigues

Well-known member
It should result on 22x and the FOV increased 84% when compared to the HR zoom at 30x (minimum magnification) - zoom on the left and TS2" 30mm on the right.
Opticron_ES100_ZoomHR_TS2_30_FOVs.jpg
It also should be useful for digiscopy.
 
Unfortunately it's vignetting because the field stop of the 30 mm eyepiece is larger than the sealing window in the scope or the prism exit.
Many birding scopes can be adapted to take 1,25" astronomical eyepieces, but for the same reason it doesn't always make sense to use a 32 mm Plössl or 24 mm Panoptic.

John
 
Unfortunately it's vignetting because the field stop of the 30 mm eyepiece is larger than the sealing window in the scope or the prism exit.
Many birding scopes can be adapted to take 1,25" astronomical eyepieces, but for the same reason it doesn't always make sense to use a 32 mm Plössl or 24 mm Panoptic.

John
Yes, but it depends on the scope models...
On this case it vignettes but shows a wider FOV than any 1.25" eps, showing larger AFOV than a 32mm Plössl - after your post I remembered to compare it to the TS SV32 1.25" (is also possible to reach focus, removing the 1.25" barrel (the lenses are fixed to the ep), but I don't know any adapter ring to secure the ep to the scope...) - the 2" ep show more 7% of FOV than this ep (+11% comparing to the zoom ep), with also wider AFOV.
This is also applied to the Optolyth 100 and the Pentax PF100.
 
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