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Originally Posted by Starkler
I havent used a powermate, but my Celestron ultima barlow in no way gives me any eye relief difficulties with my Pentax XL's
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Geoff,
It does give eye relief difficulties. It extends the eye-relief from 20mm to about 24mm making it slightly more difficult to hold the exit pupil than when using the powermate. This doesn't cause me any problems, it may do for a less experienced observer. Regardless, it is not as comfortable to observe with the longer eye-relief created by the Shorty Plus compared to the Powermate. There is a good reason Al Nagler designed the Panoptic interface, and this is it. If I didn't have the powermate I would be happy to use the shorty plus all the time, regardless of the eyepieces I own. On the other hand however, the extra $175 I paid for the powermate isn't going to change the course of my life, so I will take the powermate all day every day. As I also said earlier I still use the shorty plus as well as the power mate when the powermate gives me a little too much power. If I could only have 1 ? The powermate in a heartbeat. If $$$$ were an issue? The shorty plus in a heartbeat.
CS-John B