Posts Made By: James Goldring

Just purchased my first serious scope, a Borg 100mmED refractor(semi-apo) and now need to pick out some eyepieces. I'm not sure I understand how the focal length of the telescope plays into the decision of which EP to buy or if it's a factor at all. For example, does this have anything to do with whether or not one choose a wide angle EP or not? Initially, I will be viewing the moon, planets and whatever else I can find from a suburban St. Louis location. Not ready to go all out yet, but willing to spend in the $50-80 range. Would start with 2-3 EPs and a Barlow. Any advice regarding types, sizes, brands to get me started would be much appreciated.
Thanks in advance.
Jim

Just purchased my first serious scope, a Borg 100mmED refractor(semi-apo) and now need to pick out some eyepieces. I'm not sure I understand how the focal length of the telescope plays into the decision of which EP to buy or if it's a factor at all. For example, does this have anything to do with whether or not one choose a wide angle EP or not? Initially, I will be viewing the moon, planets and whatever else I can find from a suburban St. Louis location. Not ready to go all out yet, but willing to spend in the $50-80 range. Would start with 2-3 EPs and a Barlow. Any advice regarding types, sizes, brands to get me started would be much appreciated.
Thanks in advance.
Jim

I have read that one can use a small, stainless steel ball bearing at a distance as a point source to carry out a star test during the day. This seems advantageous as one does not have moving target to contend with. I've not been able to to find info on what distance and what size bearing to use. Input from anyone with experience with this technique would be appreciated.
Thanks in advance.

Jim