ASKAR is the new line of selected telescopes for astrophotography. With these telescopes a high attention is paid to the optical, but also mechanical quality. FRA stands for refractor telescopes with integrated corrector element for a flat and corrected image field. The FRA series is mainly used for astrophotography.
The ASKAR FRA500 is a 5-element apo according to Petzval with 500mm focal length, f/5.6 and 9 mm aperture. In the lens there are 2 ED glasses for a good correction of chromatic aberration. The apo is corrected for cameras up to full-frame.
The dew shield also provides good protection against stray light and is retractable. The large focuser holds even heavy cameras and allows clean focusing due to dual speed. The focuser offers a range of connections for all common astro threads. Also included is an adapter to M48x0.75, which is ideal for all cameras with 55 mm working distance. This adapter also has a possibility to screw in 2" filters.
The ASKAR FRA500 is designed for astrophotography. However, due to the comfortable working distance, 2" star diagonals can also be connected. This turns the astrograph into a very nice spotting scope and telescope for astronomical observation and also landscape observation. We will be happy to advise you on the suitable adapter.
The focal ratio of f/5.6 is already relatively fast. But often there are wishes for even faster optics. With the optional FRA400Red you can increase the speed from f/5.6 to f/3.9, thus halving the exposure time. The focal length is shortened to 351mm.
Characteristics:
- 5 lens Petzval design ED Apochromat
- Aperture 90mm, focal lenght 500mm, f/5.6
- Astronomical telescope and telephoto lens
- Modern multi coatings
- 3.5" R&P focuser w/ micro reduction
- Adapters for photographers included
Delivery:
- FRA500 Quintuplet Flatfield Apo Astrograph OTA
- 3.5" R&P focuser w/ reduction
- CNC tube rings with attached handle
- Loasmandy level mounting plate
- Photo adapters
- finder scope bracked mounted
- Inspection list
Products specifications
| Focal length | 500 mm |
| Aperture | 90 mm |
| Transportation length | 410 mm |
| Focal ratio | f/5.6 |
| Tube weight | 4.1Kg |
| Type of telescope | 5-element quintuplet apo with 3-element ED lens |
| Filter thread | 2" filter thread (M48x0.75) is integrated in the camera adapter |
| Connection to camera | M68x1 external, M54x0.75 male, M52x0.75 female and M48x0.75 male |
