I rented a 70-200 2.8L IS for the weekend to shoot a Confirmation service at our Parish this weekend using my 5D3. During rehearsal I became very concerned about the high ISO I was needing to use so I also pulled out my 85 1.8. I am probably being too conservative with my shutter, not relying on IS, but the lens is new to me. Here are some examples of both lenses:
70-200 f2.8 IS lens: 100mm, f2.8 1/80 ISO 8000
Here's my 85: 85mm f1.8 1/80 ISO 4000
I was expecting more quality dropoff with the higher ISO shots using the zoom but I'm not seeing it. Granted my 85mm shot might be overexposed a bit.
I'm pretty sure I should stick with the zoom over the 85 but I could use some help.
Should I be looking at slowing the shutter, perhaps to 1/60 with the IS? I guess I'm wondering what combination of ISO and shutter speed some of you veterans would use in this situation. You can tell by my ISOs that this church is DARK. At 100mm do I dare shoot at 1/60 or am I asking for trouble?
Thanks very much