Ideal for any Mac with Thunderbolt 3
Dual Thunderbolt 3 ports
USB 3 • USB-C
5K and 4K display support plus Mini Display Port
Analog sound in/out and Optical sound out
Works on any Mac with Thunderbolt 3
Focusing Screens for Canon or Nikon
Is there a split-prism focusing screen for my Nikon or Canon and does it help with focusing accuracy with manual-focus lenses?
I'm often asked, particularly with Zeiss ZF and ZE lenses, whether there is a split-prism focusing screen for various Nikon and Canon DSLRs.
Canon and Nikon do not offer a split-prism focusing screen for their DSLRs, but KatzEyeOptics.com does for some cameras (but not all). There is a split-prism screen for the D700 for example, but not for any Canon 1 series or 5D* cameras; they are all for the smaller-sensor models. At least not at present.
Nikon and Canon both offer alternative focusing screens for some models. In general Nikon offers few choices (if any) and Canon has more. If you want to try a different screen, my preference is either a super-matte variety or a grid screen (for composition).
I have good success with the standard screens on Nikon and Canon.
When feasible, stick to Live View, which is most accurate of all. Get a Hoodman Hood Loupe for Live View focusing. When you install a different screen there is often some other compromise made; whether it's an overall win will depend on your own usage.
Update — reader reports
Reader Murray O reports "I had Katz Eye place one in my D700 (I sent it in; well worth the nominal fee for the quick turn around time); what was lost was spot metering. Otherwise, it works like a charm."
Reader Chris D reports "I use brightscreen for my d3 and have a katzeye for my d2x. Katzeye does not offer a screen for the d3/x. I like both although I think I will try the diagonal split screen. The horizontal one is just not critical enough for me"
Reader Sten R reports sanding a Canon screen to fit Nikon: "I bought the a split prism screen from Brightscreen (large split prism version). The split and prism area is huge and very convenient for the purpose of getting things in focus, but the drawback is that it totally messes up the spot- and to a certain degree the CW- metering. A modified Canon EC-B works much better (although spot metering is affected a little with this too). When verifying achieved focus using the matte area, subjects pop into focus much easier with the Canon screen compared to the two Nikon screens available for the D3.".
Reader Mihai B reports getting a split-prism screen for Canon at FocusingScreen.com.
Reader Don K wrote to express his satisfaction with a focusing screen for the Nikon D3 from Brightscreen.com (also available for many other cameras). I have no personal experience with these screens, but a number of readers have emailed to ask about alternatives, so I'm passing it on as an item of interest. One speculative concern I have is metering accuracy; on Canon EOS one has to choose the correct screen in custom settings, even for Canon-supplied screens. Nikon doesn't offer such a setting (and offers only two screens for the D3), so it's unclear if metering is affected.
My personal preference is for the Nikon D3 Type-E grid screen, for its gridlines. Note that in spite of the BH description, it does not offer on-demand grid-lines; they are etched onto the screen.
High capacity, high-performance fault-tolerant storage for photography and video.
Non-RAID or RAID-0/1/4/5/10.
Capacities up to 56 Terabytes!
USB-C Travel Dock
Fast charging with up to 100W!
HDMI, SD card reader,
USB-C port, 2 USB Type-A ports
Built-in cable self-stores neatly.
See also OWC 14-port Thunderbolt 3 Dock"