If you're on a budget and need long eye relief, your best option is the 5mm LE also sold by Andrews. These have a narrow (about 40 deg) FOV but they are reasonably sharp on axis, will work well in your F8 scope and have 20mm of eye relief. They only cost about $50 each. They are pretty good value. A Pentax XW they are not, but they are also only 1/8th the price.
FWIW I dont go much on the Andrews ED eyepieces. I prefer the LE series of the 2 and they are a bit less money.
CS-John B
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