Steve Ward

Nice brass Gregorian on Sunday's broadcast about 29 minutes in ... https://www.bbc.co.uk/iplayer/episode/m001bf3j/antiques-roadshow-series-44-ham-house-3

Sadly not aurora-wise though ... https://www.swpc.noaa.gov/

Latest Aurora map image ...

With reflectors the cooling to ambient is to reduce air currents inside the tube disrupting the view , it's not the figure of the mirror that is "off". The relatively warm primary mirror when cooling down creates these currents by forming a thin layer of warm air that rises up the tube causing the shimmering seen at the EP. Cats and Maks suffer the same causing small plumes of warm air around the internal baffle tube. If on the other hand you cool your EPs to ambient you will find them misting up almost immediately when you bring your warm eye up to them so they are better of in a warmer enviroment such as your pocket. It's the same thing as a refractor gathering dew on the objective when warm moist air hits the glass , hence the use of dew shields and dew heaters on the front.

Try this one then ... !

Snatched a few through the gloom ...

Thank you for your very kind words sir ...

Finally got a patch of blue to play in after an age of grey ... Awful seeing but found 26 frames to stack from 400 shot. Canon 6D + Evostar 150 + 2x Barlow + Baader ND3.8 +Oiii.

Did you clean the back of the rubber keypad buttons as well ... ?

And clouds have baffled him before ... 😄

It's not moving half as fast as it does in this other video on his/that channel , classic footage from what I suspect is the flat-earthers favourite the Nikon P1000.

I think the word is persistent ... 😄

You've received the same correct explanations now , from numerous individuals , on both of the most respected astronomy forums on the planet ... I fail to see how you are going to be convinced as to the answer as it's obviously not the cranky , conspiracy based , answer you were looking for ... 😉

Pete Lawrence is headed to Greenland if that's any help ... 😄 Personally I'm biding my time until the year after when I'm heading to Sfax , Tunisia which will deliver over six minutes of totality as opposed to the measley 1:45 or so in '26 .... 😉

I'll be honest and say that I've never found it all that accurate , but I'm mainly solar imaging and daytime conditions vary wildly depending on location , time of day etc , hence my "get out while it's clear" approach. If I waited for perfectly transparent blue sky and super seeing I'd never get any glass aimed at it .