How does the Askar 203APO's retractable rear tube help with binoviewers?
Binoviewers need extra inward focus travel. With the rear lens tube contracted, the 203APO can be used with a binoviewer for visual observation.
Is the Askar 203APO suitable for imaging Jupiter or Saturn?
The large 203mm aperture gives high resolving power, and the f/7 focal ratio is an excellent starting point for high-resolution planetary imaging. When combined with a high-quality 2.5x or 3x Barlow lens and a high-frame-rate planetary camera, the Askar 203APO can achieve the long effective focal lengths needed to capture fine details like the Cassini Division in Saturn's rings, cloud bands on Jupiter, and surface features on Mars.
Does the Askar 203APO require a field flattener for imaging?
Yes, for a flat field on large sensors (APS-C and full-frame) a dedicated corrector is needed. Askar has announced a 203APO reducer and flattener; none is included.
Can I use standard 2-inch and 1.25-inch accessories with the Askar 203APO?
Yes. The Askar 203APO is equipped with a large 3.5-inch focuser that terminates in a standard 2-inch opening. It also includes a 2-inch to 1.25-inch adapter, for 2-inch and 1.25-inch diagonals and eyepieces.
What is the purpose of the long 500mm Losmandy dovetail plate on the 203APO?
A long and heavy telescope like the Askar 203APO requires careful balancing on an equatorial mount, especially when adding cameras, filter wheels, and guide scopes. The included 500mm Losmandy plate provides a wide range of adjustment, making it much easier to slide the entire 23.5kg assembly forward or backward to balance it in both Right Ascension and Declination.
How portable is the Askar 203APO with its 1145mm length?
While the 203APO is a large instrument, its retractable dew shield reduces the transport length to 1145mm. It comes with a fitted aluminum case with wheels for easier transport. The main consideration for portability is its 23.5kg gross weight, which requires a heavy-duty mount and a deliberate setup and teardown process at a dark-sky site.
What are the two finder bases on the Askar 203APO's focuser for?
The dual finder bases provide flexibility. You can mount a finder scope on either side of the focuser depending on your preference. The second base can also be used to mount an additional accessory, such as a small guide scope, without interfering with your primary finder.
How does the 360° rotator on the Askar 203APO's focuser work?
The 360° rotator is a ring at the rear of the focuser that allows you to turn your entire imaging train (camera, filter wheel, etc.) without loosening the focuser or rotating the main tube. You simply loosen the rotator's locking screw, turn your camera to the desired framing angle, and then tighten the screw to lock it in place. This is essential for precise composition of astrophotos.
Does the Askar 203APO come with a case for transport?
Yes. The Askar 203APO includes a rigid aluminum case with custom-cut PE foam interior. The case is designed with wheels for easier transportation and has extra space reserved for accessories like an electronic focuser.
