Askar 50P f/3.8 Quadruplet APO Telescope

Ultra-Fast f/3.8 Quadruplet APO Optics

At f/3.8, the Askar 50P gathers light dramatically faster than typical refractors, allowing you to capture deep signal on faint nebulae in a fraction of the time. The quadruplet Petzval design, which includes one piece of SD glass, corrects for chromatic aberration and field curvature without the need for an additional flattener, ensuring sharp, color-pure stars across the entire frame.

The 190mm focal length produces an expansive field of view, perfect for framing large celestial canvases. Targets like the Andromeda Galaxy (M31), the North American Nebula (NGC 7000), and the vast Rho Ophiuchi cloud complex fit comfortably within the frame of a modern APS-C sensor.

Flat-Field Imaging for APS-C with 55mm Back Focus

The Askar 50P is engineered for seamless camera integration. The optical system is optimized for 1-inch sensors but provides excellent correction for larger APS-C formats, delivering a corrected image circle without the complexity of calculating spacing for a separate reducer or flattener. This simplifies your imaging train and eliminates potential sources of tilt.

Connection is made via a standard M48 adapter, requiring a common 55mm back focus. This is compatible with most dedicated astronomy cameras and DSLR/mirrorless cameras using a standard M48 T-ring. The focuser also supports a back focus range from 50mm to 65mm, offering flexibility for unique imaging setups.

Compact and Lightweight at 1.4kg for Grab-and-Go Imaging

Designed for portability, the Askar 50P weighs just 1.4kg and measures a mere 147mm with its dew shield retracted. This minimal footprint makes it an ideal companion for lightweight star trackers and portable mounts, allowing you to set up a powerful imaging rig far from city lights without hauling heavy equipment.

• Sliding Dew Shield: The integrated dew shield extends to 182mm, providing excellent protection from stray light and moisture during long imaging sessions.
• Solid Construction: Despite its small size, the telescope is built for rigidity, ensuring the optical elements remain perfectly collimated from your backyard to a remote dark-sky site.

Askar 50P vs. RedCat 51: Focal Ratio and Field of View

When choosing a portable astrograph, the primary competitor to the Askar 50P is the William Optics RedCat 51. While both are excellent Petzval designs, they serve different imaging goals.

• Competitor Advantage (RedCat 51): The RedCat offers a slightly larger 51mm aperture and a longer 250mm focal length. This provides a tighter field of view and more image scale, which can be beneficial for framing smaller deep-sky objects.
• Askar 50P Advantage: The 50P's key advantage is its f/3.8 focal ratio, which is significantly faster than the RedCat's f/4.9. This allows for roughly 68% more light gathering in the same amount of time, drastically reducing required exposure times. Its 190mm focal length also captures a wider true field of view, ideal for the largest nebulae and mosaics.

Your choice depends on your primary targets. For the widest possible vistas and the shortest possible exposures, the Askar 50P is the superior instrument.