David,
I don't know what to make of it, but the Juelich astro shop in Germany is listing a small selection of astro eyepieces from Baader etc. on their Harpia accessories list, alongside the Harpia eyepiece. This could be a mistake, of course, but would be a rather odd one for a well-established specialist store to make. I'm more inclined to take it as meaning that such eyepieces can be attached to the scope, especially as they list the magnifications that the ep. would give on the Harpia.
However, what I heard from a friend who attended Birdfair and saw the Harpia, though perhaps inconclusive, seemed to offer more weight to the idea that the Harpia zoom vignettes the exit pupil. This would compromise resolution at all magnifications except for the maximum of the zoom range, and relatively speaking more so if one were to use shorter focal length eyepieces with a higher starting magnification. 40x57.5 mm does not sound all that impressive and will not look impressive either, and if the vignetting is linear, then all the middle magnifications would be affected as well.
Kimmo
I don't know what to make of it, but the Juelich astro shop in Germany is listing a small selection of astro eyepieces from Baader etc. on their Harpia accessories list, alongside the Harpia eyepiece. This could be a mistake, of course, but would be a rather odd one for a well-established specialist store to make. I'm more inclined to take it as meaning that such eyepieces can be attached to the scope, especially as they list the magnifications that the ep. would give on the Harpia.
However, what I heard from a friend who attended Birdfair and saw the Harpia, though perhaps inconclusive, seemed to offer more weight to the idea that the Harpia zoom vignettes the exit pupil. This would compromise resolution at all magnifications except for the maximum of the zoom range, and relatively speaking more so if one were to use shorter focal length eyepieces with a higher starting magnification. 40x57.5 mm does not sound all that impressive and will not look impressive either, and if the vignetting is linear, then all the middle magnifications would be affected as well.
Kimmo