Which Powermate should I take?

Hello,

Ihave decided to buy a Televue Powermate for my LXD55 SN10. Actually I've
found that the 2.5X and the 5X are being sold for the same price $168. What
are the differences (except for magnification) and which one is better for
my scope?

Thanks a lot,
Franc

Actually I've
found that the 2.5X and the 5X are being sold for the same price $168. What
are the differences (except for magnification) and which one is better for
my scope?

The one that does not end up in the empty magnification range, when combined
with your existing ep's for high magnification viewing.


john

chose the 2.5x. The sn10 being a low focal ratio (f4?) already suffers
from coma and chromatic aberation, so a more powerful barlow would
only increase this. Personally, were it me, I would opt for a field corrector
before any barlow, especially since at f4 with that scope you are not going
to get great resolution at high magnification anyway. At least with a field
corrector you will get tighter and sharper images, wide field. If you are
looking for magnification with decent images, you will have to get a scope
of at least f/6 or up - on the cheap side a C8 ota or more expensive a
6" mak.

Steve







Franc Koljaka wrote:

Hello,

Ihave decided to buy a Televue Powermate for my LXD55 SN10. Actually I've
found that the 2.5X and the 5X are being sold for the same price $168. What
are the differences (except for magnification) and which one is better for
my scope?

Thanks a lot,
Franc