I'm in need of a grad ND filter before my trip to Utah next month. I'm using a Tokina 12-24 , a Tamron 28-75 and a Canon 70-200 L on a Canon XSi . As far as Cokin P with Shing-Ray , won't I get terrible vignetting on my Tokina wide ange? I then thought of getting a Formatt glass graduated ND and just holding in front of lens when needed but is it a pain to hold it, check DOF preview and fire shutter? Which way to go?
Cokin does make a P-style holder that only takes one filter that might not vignette on the Tokina on a 1.6x crop body, you'd have to try it so see, I don't have the lens.
It is possible to hold a GND in front of a lens in many circumstances. It's a challenge to keep it in place well for long exposures without putting pressure on the camera/lens system but maintaining contact.
Heck, it's even possible to hold a GND, check DOF, hold a cable release and point a flash at a reflector (that someone else is holding)....
Photo of me doing just that in Greenland:
http://www.rockslidephoto.com/pix/random/s...photography.jpgPhoto Courtesy Josh Andrews.
What I was shooting, and why I was doing such a silly thing:
http://rockslidephoto.com/blog/?p=314--Joe