Solar filter

[neuroanatomist]

Thanks, Jonathan. Based on your efforts, the 140mm version should work well for the 600/4. B&H sells them (as special order items, with 2-4 week delivery; Google shows other US suppliers with stock on hand). I'll need to decide whether I'm going to take the 600/4, or use the RF 100-300/2.8 with a TC.

My older daughter is very excited about the eclipse, and at her request we are planning to drive up to New Hampshire for the event.