Askar FRA300 Quintuplet refractor with 60mm aperture and f/5 focal ratio, ideal for wide-field imaging of the deep sky
Quintuplet Petzval ED design delivers flat field across 44mm image circle with virtually no chromatic aberration
Includes rotatable 2.5” dual-speed rack-and-pinion focuser, Vixen-style dovetail, tube rings, and carrying handle
Length = 303mm, Weight = 3.12kg
The Askar FRA300 compact astrograph incorporates a five-element design to deliver flat fields and sharp, color-free images. With a 60mm triplet objective with an ED element and a two-element corrector, this f/5 scope has a focal length of 300mm and makes an ideal instrument for capturing stunning wide-field images of the deep sky over a 44mm full-frame image circle.
The fast f/5 Petzval design means no additional field flatteners or focal reducers are required which offers flexibility with back focus when incorporating additional accessories in the optical train.
This premium astrograph includes a 2.5” rack-and-pinion dual-speed focuser that’s fully rotatable through 360 degrees to make it easier to frame images. The focuser tube and included adapters allow for direct attachment of cameras with M42, M48, or M54 threads. Note that the limited available back focus, though sufficient for cameras and some imaging accessories, is not sufficient to allow use of this scope with a diagonal and eyepieces for visual use.
The attractive spray-coated optical tube of the FRA300 is complemented with a set of CNC-machined aluminum rings, a 300mm Vixen-style dovetail, and a carrying handle with a slot for a guide scope. The entire tube is just 303mm long and weighs 3.12kg.
For the price, this fast apochromatic telescope offers excellent value and can approach the performance of telescopes that cost three or four times as much. This is especially true when matched with astronomy cameras with smaller 1" and 4/3" sensors. Cameras with larger APS-C and full-frame sensors may, in some cases, reveal slight aberrations at the edge of the field.
Specifications:
Aperture size:60mm
Focal length:300mm
Focal ratio:f/5
Objective lens: Quintuplet fully air-spaced Petzval APO (including one ED element)
Image circle:44mm full-frame
Maximum accessory connection (with the focuser fully retreated):
Imaging mode:
71mm (from the base of M42×0.75 male thread)
67mm (from the base of M48×0.75 male thread)
71mm (from the base of M54×1male thread)
Total length:303mm
Net weight:2.26kg
Gross weight:3.12kg
Rear-end thread:M48x0.75 male thread
Main tube diameter = 82mm; Dewshield diameter = 91.3mm
What's in the Box
FRA300 OTA
Tube ring
Handle
Askar 300mm Vixen dovetail plate
M54, M48 and M42 adapters (1 each)
Manual
Schematics
Astrophotos
(Click for high resolution version)
(Click for high resolution version)
Askar FRA300 pro + ZWO6200,LRGB Total 3hrs
(Click for high resolution version)
tjm8874 / twitter, astrobin
Veil Nebula, wide field
Askar FRA300 Pro
Nikon Z6 (modified)
iOptron GEM28
Optolong L-eXtreme 2"
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Pleiades Astrophoto PixInsight
54x300" (4h 30')
(Click for high resolution version)
tjm8874 / twitter, astrobin
Rho Ophiuchi to Antares Nebula and M4
Askar FRA300 Pro
Nikon Z6 (modified)
iOptron GEM28
ZWO ASIair Pro
Pleiades Astrophoto PixInsight · Photoshop · APP
ZWO 30F4 Guidescope
ZWO ASI290MM Mini
30x180" (1h 30')
65PHQ is a flatfield astrograph newly launched after 80PHQ, 107PHQ, and 130PHQ. Instead of buying extra flatteners, calculating the back focus of the flattener, or making a tedious connection to match the correct distance, astrophotographers can simply equip it with any possible imaging accessories, make the target stay at the focus, and then the whole optical system is perfect for imaging.
65PHQ has a smaller size than other PHQ astrographs. 65PHQ has a focal ratio of f/6.4 and a focal length of 416mm. Instead of the quadruplet structure of other PHQs, the 65PHQ is a quintuplet with two ED glasses which offers excellent control of chromatic and other aberrations. With its self-flattening design, 65PHQ offers strong advantages in the astronomical shooting. It supports the full-frame image circle and has a fine spot diagram with tiny distortions of the peripheral stars.