The PENTAX PF-80ED features extra low dispersion glass elements, a large 80 mm objective lens, and a nitrogen filled (JIS Class 6) waterproof body for the perfect blend of durability and outstanding image quality even under the most demanding conditions.

The PENTAX PF-80ED-A features a 45-degree slanted lens barrel for comfortable viewing in almost any situation. Housed in a lightweight magnesium-alloy body, the PENTAX PF-80ED-A features extra low dispersion glass elements and large 80 mm objective lenses for outstanding image quality and clarity under all light conditions.

The PENTAX PF-100ED features a large 100mm objective lens for bright viewing under all light conditions. Featuring a straight-line optical barrel design, extra low dispersion (ED) optics incorporating Lanthanum Crown glass elements and waterproof construction, the PF-100ED provides durability and optimum optical resolution.

The Pentax 75 SDHF is an apochromatic refractor with a fully corrected, flat field for photography. Its three lens design offers pinpoint stars to the edge of a very large field (6x4cm film format). At the same time sharpness on the centerline is also excellent. The third lens is a field flattener. You can therefore save the money on a separate field flattening lens that you have to buy for imaging with most other apochromatic refractors.

Like most Pentax refractors the Pentax 105 SDP was designed both for visual and photographical use. This true apochromatic refractor excels in both fields. On the optical axis the Strehl ratio lies between 96 and 97%. This is far better than diffraction limited (80% Strehl). What sets the Pentax 105 SDP apart from most other refractors is its excellent image quality over the entire field. This allows demanding astro-imaging with high resolution over a large (6x7cm) film format.

The Pentax 100 SDUF-II is a no-compromise telelens for astro-imaging. With its integrated corrector / field flattener it offers an excellent image sharpness over the entire field (airy disks < 20um even at the edge). Colour correction is very good considering its extreme focal ratio of f/4.0. Image quality is very good over the entire, huge corrected photographical field.

Like most Pentax refractors the Pentax 125 SDP was designed both for visual and photographical use. This true apochromatic refractor excels in both fields. On the optical axis the Strehl ratio lies between 96 and 97%. This is far better than diffraction limited (80% Strehl). What sets the Pentax 125 SDP apart from most other refractors is its excellent image quality over the entire field. This allows demanding astro-imaging with high resolution over a large (6x7cm) film format.