Askar FRA300 PRO Astronomical Telescope with 2nm RMS Diameter and 5-pieces ED Fully Separated Petzval APO Objective Lens

Description:
- The focal length of FRA300pro is 300mm. The star points are delicate, and the RMS radius of the central star point in the field of view can reach an astonishing 2 micrometers or less, which can meet the strict requirements of experienced players for star points. Excellent full frame performance can support a 44mm image circle, making it a rare star shooting tool for astronomy enthusiasts. The focal ratio of F5 can effectively reduce exposure time, saving a lot of time and achieving the same exposure effect compared to the focal ratio of F6 or F7.

- The main lens adopts a five piece fully separated structure, one of which is ED glass, and the coating adopts a full multi-layer coating, effectively removing reflected stray light.

- It is particularly worth mentioning that this rear group lens adopts two sets of far separated refractive lenses, which not only improves the quality of star points but also improves the correction performance of star point aberrations, and has excellent full range peripheral dimming control.

- Due to the use of a native Pittsburgh design, users do not need to calculate the post intercept, as long as the focus is within a certain range, it is the optimal position.

- In terms of mechanics, the lens barrel is processed with high-quality CNC, with high-end paint spraying and bright oxidation treatment on the surface, which is beautiful and durable. The hoop design is fashionable, beautiful, and light, although it increases costs, we hope that enthusiasts will receive optical lenses that perform well in all aspects, taking into account various details.

- The focusing device adopts a 2.5-inch toothed focusing device, which is solid and beautiful. It not only has coarse adjustment, but also a micro focusing handwheel to make focusing more precise. With the adapter, it is converted to the commonly used M48X0.75 thread on the market. In addition, there are two separate M54X0.75 and M48X0.75 connectors in the standard set, which are convenient for connecting various imaging devices and accessories. The end is also equipped with a 360 degree rotator, which is convenient to rotate at any angle during shooting. The FRA300 PRO is also equipped with a multi-functional handle and a 300mm long VIXEN narrow dovetail plate, which can directly connect various equatorial instruments and accessories on the market. In addition, the multi-functional handle can also be connected to the finder-scope base of the general VIXEN specification on the market. The length of the dovetail plate is 300mm, which is conducive to the balance of the lens barrel on the equator.

Specification:
- Aperture size: 60mm
- Focal length: 300mm
- Focal ratio: F5
- Objective lens: 5-pieces ED Fully Separated Petzval APO
- Image circle: 44mm
- Maximum accessory connection (with the focuser fully retreated):
  Imaging mode:
  71mm (from the base of M42 x 0.75 male thread)
  67mm (from the base of M48 x 0.75 male thread)
  71mm (from the base of M54 x 1male thread)
- Total length: 303mm
- Net weight: 2.26kg
- Gross weight: 3.12kg
- Rear-end thread type:
  M42 x 0.75 external thread
  M48 x 0.75 external thread (built-in 2inch filter thread)
  M54 x 0.75 external thread

Package Included:
- 1 x Host
- 1 x Hoop
- 1 x Handle
- 1 x 300mm VIXEN Narrow Dovetail Plate
- 1 x M54 x 0.75 Connection Ring
- 1 x M42 x 0.75 Connection Ring
- 1 x Warranty Card
- 1 x User Manual