I'm getting into my landscape photography a lot more and struggling with exposures, so it's time to get a filter system.

I own an array of lenses; EF17-40mm, EF100-400mm, EF50mm f/1.4 & 100mm Macro. I use these on my Canon EOS 6D.

What filter system should I go with? I don't want to spend hundreds right now so I'm looking at Cokin, however I'm not sure what filter mount I should get for my array of focal lengths.

Any help is appreciated, Andy

  • \$\begingroup\$ What are the filter thread sizes for those lenses? \$\endgroup\$
    – null
    Commented Oct 5, 2016 at 9:02
  • \$\begingroup\$ 77 on wide angle, 77 on 100-400, 58mm on the 50mm prime, 62 on the macro. \$\endgroup\$ Commented Oct 5, 2016 at 9:06
  • \$\begingroup\$ The thing I was worried about most was the field of view on the lenses. I used to have an old P system from cokin, but on my old APS-C Nikon, the edge of the frame was creeping into shot, and with the 6D being a full frame AND the wideangle being 17mm at it's lowest, I don't want to get it wrong \$\endgroup\$ Commented Oct 5, 2016 at 9:07

1 Answer 1


On all of the lenses you list but the EF 17-40mm f/4 L you could get by with the Cokin P series which uses 84mm filters. For wide angle lenses with 72mm filter threads Cokin recommends using the Cokin Z-Pro Series which uses 100mm filters.

Based on several online reports, including this thread, from those who have tried the standard P series holder with the EF 17-40mm f/4 L you'll get vignetting at focal lengths shorter than about 20mm with a FF camera. The Cokin "wide angle" holder that is thinner and only holds a single filter does a bit better but still vignettes slightly at 17mm. Since the filter holder is thicker on the sides than on the top and bottom, turning the filter holder 90° will reduce the vignetting, but that limits your ability to use rectangular graduated ND filters.

Keep in mind that the EF 17-40mm f/4 has fairly significant light loss in the corners at 17mm and f/4 even when there is absolutely nothing attached to the front of it. How much more you're willing to tolerate caused by the filter holder could also factor into your decision.

  • \$\begingroup\$ Thanks for this Michael. Going to be a tough decision I think, I don't want to spend too much but I don't want the vignetting really. Although I don't really shoot often at 17mm-20mm, you never know \$\endgroup\$ Commented Oct 5, 2016 at 11:11
  • \$\begingroup\$ Here's another link that might help: fredmiranda.com/forum/topic/1110012 \$\endgroup\$
    – Michael C
    Commented Oct 5, 2016 at 11:28

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