- #1
pixel01
- 688
- 1
Hi all,
Do you know why the lense (or mirror) of telescope often requires that the focal lengh be rather long? What is different between a backyard telescope and a normal camera?
Thanx.
Do you know why the lense (or mirror) of telescope often requires that the focal lengh be rather long? What is different between a backyard telescope and a normal camera?
Thanx.