I put the 300mm f4 + MC-20 on the OM-1 last night and took some moon shots hand held with the hand held high resolution mode. This is the best one. The HHHR processing is quite fast now so it is not too tedious to take several shots! This is 200 ISO at 1/800s f8.
To process the file I used OM Workspace and the USB Raw Data edit. In OM WS I added some sharpening, noise reduction and crop, then I exported it to a TIFF and did further processing of it in CaptureOne 21. The USB Raw edit with the camera speeds up the OM WS processing quite a lot when exporting.

Moon 2022.03.15 OM-1 HHHR Shot by Bill Dennis, on Flickr
To process the file I used OM Workspace and the USB Raw Data edit. In OM WS I added some sharpening, noise reduction and crop, then I exported it to a TIFF and did further processing of it in CaptureOne 21. The USB Raw edit with the camera speeds up the OM WS processing quite a lot when exporting.

Moon 2022.03.15 OM-1 HHHR Shot by Bill Dennis, on Flickr