The Askar SQA55 is a multi-purpose Petzval refractor featuring 5 elements for superior correction! This telescope features a trick up its sleeve not found on many other refractors: a variable aperture. With an aperture ranging from f/4.8 to f/22, you can use the Askar SQA55 for astrophotography at night as well as daytime photography as a manual focus camera lens.