Mt Spokane Photography said:
Steve, just a guess, but it may be a issue with the filter. Some of them soften the images a lot. What brand is it?
I was not thrilled with my first try, then the sun was blotted out by smoke and not visible at all for over 2 weeks, but it does look sharper. It was captured with my 5D MK III and 100-400mm L II, and cropped way down. I used live view and live autofocus.
Thanks for the reply. It is a Firecrest, made in the UK by Formatt Hitech. I couldn't find anything on line that looked like it was worth ordering and was in stock. I put in requests with B&H to notify me when any of a few models were in stock, and I got email about this one, so I ordered it and a pack of glasses immediately. They rate it at 18 stops. The company seems rather serious about neutral density filters, and their other models get good ratings on Amazon and B&H. But that doesn't necessarily prove that the filter is not the weakest link in an otherwise already iffy chain. As I already said, I know the lens is not very good, certainly relative to my other Canons. The user is incompetent at this, but getting better with a little practice. For this test, I didn't put the little eyepiece cover back in after it came out on my way outside. Clouds were coming and going, so even at its clearest, there was almost for sure some haze.
And its not like I can run much alternate setups for testing. The only other lens I might try is the 100mm macro (non L). It is a fine lens, but I don't know that the tiny image of the sun it would produce would tell me anything. Since you used autofocus, maybe I should try that. Or maybe use it once and switch it off.
From the weather forecast, I may not even bother to drive to SC that morning, and just hope that I get a break in the clouds some time from here, where it will peak at 97%. Maybe I will visit my friend in Dallas in 2024 if we are both still alive and not too senile by then.
If this were critical, or even important, I would have used it as an excuse to buy a decent telephoto lens. But I would like to see what is the best I can do under the circumstances, weather permitting. If we get any sunshine this week, I guess I'll try out f/5.6 and f/11 and see if the lens does any better. If I have way plenty of time in the sun, I might even try the 100mm. But as I think I said somewhere on this forum, the zoom at 300mm (480 equivalent crop) has produced passable moon pictures, such as this one (full resolution, cropped, I think, obviously not corrected for CA):