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The Tele Vue Optics AP 102/877:

The Tele Vue apochromat 102 is a two lens with the highest quality workmanship in a classic design. The aperture is 102mm with a focal length of 877mm. It is optimal for all astronomers, the one looking in every respect expandable apochromat.
Even up to the highest magnification ranges (around 300 times) into the device Duch stands a very pure color imaging, although no field-flattening (eg compared to the more expensive NP 101) is available.
With a 55mm Plossl example, you come to a respectable field of 3 degrees on the sky, all at 16x magnification. Even with modest eyepieces come thanks to the large focal length to maximum magnification for planetary observation.
Also in the field of astrophotography which makes TV 102 is a good picture: The images at f / 8.6 are sharp, but the margin is a slight blur to be expected by the curvature of field. Using a Brennweitenreduktors (at 6.88) and the use of a flattener (0.8 L - see accessories) can be compensated for this effect, however.

The advantages at a glance:

• versatile, expandable Apochromat
• suitable for astrophotography
• sharp, pure color illustration