Been a while since posting on Cloudy Nights!
Finally, after a lot of hard work, I've managed to flatten the uneven background in this shot. That was mostly caused by bright pollen drifting through the image. There was so much of it that it didn't average out and became visible when the image was stretched. This image shows the full 360 degree atmospheric ring. It also shows non-uniform brightening around the edge of the planet, most notable at the 2 o'clock position but also evident elsewhere. This is a real variation replicated in the few extended cusp images I've seen from this apparition. This image is the culmination of a fascination with this phenomenon. I first read about it in a book (which in later years I contributed to!) which showed a photo of the ring taken by James W Young in 1964. http://www.w7ftt.net/venus1.html
The ring in this image was taken on 2 June at 08:00 UT. At this time Venus presented a 57.8 arcsecond disc, a 0.1% phase and was 2.4 degrees from the Sun.
I nearly caught the full ring back in 2004 before the Transit of Venus. However, due to technical reasons, that attempt didn't produce enough signal to complete the 360. Then in 2012 I did manage to grab a grainy shot of it from Svalbard. Setup was trick for this one as I was filming with Sky at Night and didn't have access to all the kit I wanted. It also meant kneeling on a gravel path which was very uncomfortable!
This one was far more comfortable but no less tricky. It was Tony Philips (Spaceweather) who described this shot as requiring the equivalent of a black-belt in astrophotography. He wasn't far off the mark either as it's pretty tough going at times and requires a fair degree of risk.
Is it possible to grab it on the morning reappearance? Yes, in theory it is. However, it's not something I would recommend or attempt myself. When Venus is off to the east of the Sun, if something happens with your telescope drive (power loss, stalling due to imbalance, etc.) the Sun will drift away from the field of view. If you attempt this in the morning sky, drive failure will result in the Sun drifting into the field of view. By the time you realise it's happening, it's too late!