Askar M54 OAG + M54 Filter Drawer vs. ZWO OAG + M42 Filter Drawer vs. Celestron OAG
Be sure to check out my Part 1 video where I unbox and do an initial overview of the Askar M54 OAG and M54 Filter Drawer.
• Askar M54 OAG (Off-Axi...
One key aspect that I compare is the prism size and clear aperture for the guide cameras and in that key metric, the Askar is much better than the ZWO OAG. One thing that I found out is that ZWO did update their design so that the clear aperture instead of being 5.5mm is now an elongated hole that is 7.4mm x 5mm in size, which is now big enough to fit the entire IMX290 sensor in frame, whereas most of the ZWO OAGs out there, like mine, with the smaller 5.5mm hole can not fully utilize the entire IMX290 sensor area. I asked ZWO and they said the update happened in August 2021, so only the latest ZWO OAGs have this larger aperture and most will be the old smaller hole.
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