The day I couldn't get the HHHR to work with the bare 300mm - I was trying to get an early moon with light clouds. So you're right, that would have definitely made a difference. I was still bummed.Maybe the atmospheric conditions were different this time, and it needed larger contrasting areas to lock onto?
Here's a hummer from as close as I could fit in the frame. ISO 3200 here, the background was 'splotchy' after noise reduction so I selected the background and darkened it - it still looks splotchy. I cut a tip of his head off and added background at the top. This is from the .jpg file.
I've had no time - helping my 84yo mom move from her house of 50 years....nuff said.
Here's the original if you want to play with it I think my in-camera profile is set to muted- matted? I can't remember.