[Gh0st10 (Kris)]

Hi guys, new to the forums, how are you all?

I've been a bit confused with a lens I have.

I feel I have an OK knowledge of normal telescopes, reflectors, refractors, focal lengths and light gathering ability and I would be able to buy a good factory made telescope with this knowledge.

I was looking for information on this lens though. It is from a set of 100mm binoculars(navy binoculars the guy told us, ???). My father has made a telescope out of it, he's a boilermaker, and with boilermakers usually oxy cutting a nut off instead of undoing them, you can imagine the telescope is fairly crude, made out of steel and is heavy.

Now, the lens. 100mm, which in a normal refractor telescope would be quite good for amateur astronomy, but as this lens has a very short focal length of 370mm it stumps me.

What type of telescope has a 100mm f/3.7 lens? as I understand it, the lower the f ratio, the lower you can magnify the focal point and it has a larger field of view?
What should I be looking at with this telescope?

any advice would be greatly apreciated.

Ghost