I was wondering if anyone out there is using a Canon 17-40mm lens with a high (i.e. 10 stop) ND filter. I'm thinking of building a small set of 82mm ND filters (separate, not variable - probably a 4 and a 10 stop to start with) along with step rings so I can use it on all my glass.
I guess the question is two-fold:
Is anyone using strong ND filters with this lens and do you see any vignetting on the 17mm end?
Any ramifications to using an 82mm ND filter and step ring to put it on the 77mm thread of the 17-40 lens?
TIA for any info.
FWIW this lens has a rear 'gel' filter holder so you can use tiny gel filters that cause no vignetting at all
Never tried it though myself
Had to get up and look at my 17-40 f/4L and can't find where the gel filter goes. Nothing like my 500 has for filters.