Περιγραφή
Askar f / 3.9 Focal length reducer suitable for full frame cameras FRA600 / f / 5.6 lens telescope.
The new Askar FR600 f / 3.9 shortens the focal length of the telescope by 0.7 times. The original f / 5.6 turns into a fast f / 3.9 apochromatic telescope. Significantly shortens shutter speeds, about 50% shorter. The field size expands at the same time.
