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This is a very quick update, as it's been a busy week snce Saturday's viewing session and I am at work at present...
I was very pleased and impressed with both of these ep's, I do have to say I used the 8mm Stratus a LOT more than the 17mm Hyperion. I put this down to my original choice of 8mm size as being a very good one for my purposes, the 17mm will possibly always get less use for no other reason than it's focal length / magnification.
The 8mm Orion is very easy to use in terms of positioning your eye with good eye relief. The Hyperion in 17mm is a little more sensitive: to maintain a full fov your eye must be reasonably centred on the optical axis or you tend to get side "blackouts". This is not the typical kidney-beaning as I have seen through Naglers belonging to other people, and this ep is no where near as critical for eye position either. In fact I am already quite used to it but I mention this as a general part of it's overall useability. The eye relief however was even more generous, but again this had to be used to maintain a complete image, you cannot let yoru eye get too close to the ep itself. No part of my head will ever touch the rubbers on this ep while viewing!
I will say that when I removed the 2 element "bottom section" from the Hyperion ep to use it in it's 6 element mode in my f5 10" dob I did get a small amount of seagulling in the outer 5-10% of my fov. There was no visible aberation in either ep otherwise.
It's difficult to get into any in deep visual comparison just yet, as sadly the overall viewing was marred by bad seeing, despite a cloudless sky. It improved a little bit later on, but it was very bad early in the evening.
More testing required, photo's of each ep yet to come. Stay tuned.
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