The Panoptic 19mm (68x, 140x) is a favorite single ocular solution.
The Explore Scientific 68degrees are similar in reputation to the Panoptic, fatter, quite a bit cheaper. I tried the 20mm in the Questar (65x, 130x). Although I was expecting the onset of vignetting it is not at all clear there is any! Natch the barlow steps the apparent field down quite a bit—that will be true of any wide field, and not a problem for me—to approximately Brandon level.
I was afraid the fatter body would not allow the case door to close, but it does. The ES 24mm 68deg flat out does not fit. Neither does the tubby Baader 8-24mm. You cannot close the door.
Note I have not confirmed the finder focus w the 20mm.
The 82deg 150x 8.8mm ES Nagler-esq on sale might be an attractive 2 ocular solution. I do not know if it fits the case, nor parfocal w the 68 series, nor finder focus.
Edited by dougspeterson, 21 July 2019 - 06:52 PM.