It seems the first batch (serial # 1-20) had a wider AFOV of ~140°.
The remainder (serial # > #20) have a AFOV of 120° (due to installed field stop).
Compared to a 9mm 100° eyepiece (APM, ES, etc) there is quite a difference in TFOV (true field of view).
The original AFOV 140° version has 1.96X the TFOV.
The current AFOV 120° version has 1.44X the TFOV.
The AFOV 140° version has 1.36X the TFOV of the current AFOV 120° versions.
Definitely obvious that the "Majesty Factor" or "Emersive Factor" of the original ES 9mm AFOV 140° version compared to
9mm 100° eyepiece would be amazing.
If one was to buy this eyepiece, it would be obvious to purchase on of the first 20 of the ES 9mm 120° eyepieces.
However, the owners of this specific version would know this and not be willing to part with their eyepiece.
Looks like the current AFOV 120° version reviews/impressions are the only ones that can be assessed if one is considering purchasing this eyepiece.
I have experienced the "Majesty Factor" going from AFOV 82° to AFOV 100° eyepieces (1.49X TFOV) - very impressive.
The "Majesty Factor" going from AFOV of 100° to AFOV of 120° is basically the same (1.44X TFOV).
However, it is a lot easier to view an AFOV of 100° compared to an AFOV of 120°.
Can anyone comment on comparing the "Majesty Factor" of AFOV of 82° to 100° vs AFOV of 100° to 120°.
Also is the EFOB (ring of fire) very noticeable on deepsky observing (I would not use this eyepiece for planetary observing)? I am quite sensitive to EOFB - found it very noticeable on a Baader Morpheus 4.5mm.