ASKAR FRA400 f/5.6 Quintuplet Astrograph APO Apochromatic Refractor Telescope

ASKAR FRA400 f/5.6 Quintuplet Astrograph APO Apochromatic Refractor Telescope

5-LENS PETZVAL-LIKE DESIGN - TWO ED ELEMENTS - SUPERIOR 15-STEP QUALITY CONTROL - SUPERB VALUE AND QUALITY FROM SHARPSTAR!

The ultimate portable astro photo and nature photography instrument in this size and quality!

Look no further for the highest quality "Flatfield Refractive Astrograph" - FRA in the 72mm aperture.

According to customer feedback, it actually outperforms some much more expensive Japanese telescopes...

365ASTRONOMY TESTING PROCEDURES

We would usually test about 30 - 60% of the arriving Sharpstar and Askar telescopes (except the smallest ones in the FMA and ACL range). This will provide us with a good understanding of the quality of that batch of optics. We would also test the focuser and check the optical tube, tube rings and dovetail bar and accessories for any visible damage or fault and take a series of test images with a full frame dSLR camera of a specially designed test chart that will show whether the telescope is fit for a full frame sensor or not, whether the image is flat in all corners and generally it will indicate the quility of the optics, i.e. resolution. Whilst we do store this information for all tested telescopes, we don't usually include a printed report, but if you ask, we might be able to send it to you). If we find that the optics are not correctly collimated then we will send them to a specialist to correct it or if the optics cannot be corrected to a good performance then those will be sent back to the manufacturer for replacement, although our experience with Sharpstar and Asker telescopes is quite good, we rarely had to do that. We believe that there is no need to offer complicated optical test reports that would assume a degree in optical sciences from the user to fully understand them.

The FRA400 is a refractive astrograph designed with built-in flat field correction, however due to its generous back focus, it can also be used for visual observations with great success.

The FRA400 is a quintuplet Petzval-like telescope with 400mm focal length, f/5.6 focal ratio and 72mm aperture. To achieve the highest optical quality, it features two special ED glasses.

A 44mm full frame image circle is supported and the generous 140mm backfocus provides great versatily for a wide range of applications.

The telescope tube comes with a retractable dew shield, large 3" rack-and-pinion dual-speed focuser, 360°rotator, 2" eyepiece holder barrel with a 1.25" eyepiece adapter and with M68x1 thread for imaging application. All these provide good support for both visual observations and imaging.

It’s excellent in controlling and possibly avoiding chromatic aberrations, the image quality is also optimized to satisfy a wide range of customer requirements.
It’s worth mentioning that the FRA 400/5.6 has a pair of patented multifunctional attachment tube rings, so in addition to its style, the FRA 400 shows well-conceived design by having a practical three-sided attachment/mounting points, which is convenient for photography with various accessories.

A dedicated, ultra-fast focal reducer AS40007RD is available separately. With the help of this reducer you can achieve an exceptional f/3.9 focal ratio that still supports full frame cameras.

SPECIFICATIONS

Apertaure: 72mm
Focal Length: 400mm
Focal Ratio: f/5.6
Objective type: Quintuplet dual ED air-spaced APO
Overall length: 317mm
Weight: 2.56kg
Weight with accessories: 2.88kg
Back-end adapter: M68x1 male thread, 2" eyepiece holder barrel, 1.25" eyepiece holder barrel (adapter)
Back focus: 140mm from M68 thread
WHAT'S IN THE BOX

a pair of tube rings
handle
dovetail bar
quality control inspection list
instruction manual
2" to 1.25" adapter (1.25" eyepiece holder)
M68 to M48 adapter
M48 to 2" adapter (2" eyepiece holder)


Packaging size: 4.6kg, 23.56x26.5x48