10-17-2017 08:57 AM
You are at high ISOs now at f/2.8. With an f/4 lens each of those shots would be at a twice as high ISO, unless you adjusted camera settings.
12K-20K ISO is probably pushing acceptable noise limits.
10-17-2017 11:00 AM
"12K-20K ISO is probably pushing acceptable noise limits."
IMHO, I would not accept any ISO that high. Not even close as 1600 or possibly squeeze out 3200 in a pinch but nothing higher.
10-17-2017 11:07 AM
"The majority of the shots were as follows:
6400 - 4.0 - 1/500 - 70mm
5000 - 2.8 - 1/800 - 70mm
5000 - 2.8 - 1/640 - 70mm
10,000 - 2.8 - 1/400 - 70mm
10,000 - 2.8 - 1/640 - 70mm
8,000 - 4.5 - 1/640 - 70mm
2,500 - 2.8 - 1/400 - 70mm
10,000 - 2.8 - 1/800 - 70mm"
Looks like 70mm is your focal length of preference. May I suggest a different course?
The Canon EF 85mm f/1.8 USM Lens. Much faster and much lighter and much much cheaper. Plus is is as sharp as a lens can be. In fact you could have a couple of these faster prime lenses for what one 70-200mm f2.8 costs. You will love how much lighter they are and easier to handle.
10-17-2017 05:51 PM
Thank you for your input!
It is always at 70mm cause I needed to zoom in more and it still wasn't quite enough.
I will definitely look into this
Do you mean zoom out? If you need to zoom in, it would have been 200mm. I second ebiggs' suggestion - an 85mm f/1.8 will do or for roughly the same price with a 70-200mm, you can get either a newer 85mm f/1.4L IS or a 85mm f/1.2...they are way faster than the 2.8 (2 stops or more).
10-17-2017 08:06 PM
"It is always at 70mm cause I needed to zoom in more and it still wasn't quite enough."
I think it is time to learn how to post edit.