DPReview.com is closing April 10th - Find out more

Canon R7 autofocus seems inferior to 80D in low light

Started 4 months ago | Discussions thread
ThrillaMozilla Veteran Member • Posts: 7,665
Re: Canon R7 autofocus - UPDATE and SUMMARY

freixas wrote:

Franz Kerschbaum wrote:

Another BIG difference in AF between the better DSLRs and the R series mirrorless is that the later have NO cross AF sensors. the DPAF systems have only horizontals sensorpairs. In case of a "sunshade" target it may be needed to slightly tilt the camera to acquire AF! This is a rare but possible situation. Normaly the enourmously higher AF sensor number compensates for this disadvantage.

I've been learning a lot about the dual-pixel phase-detection AF. I'm not sure what a sunshade target is, but the point is that horizontal lines can be a problem. I looked at my target again (https://upload.wikimedia.org/wikipedia/commons/2/2b/EIA_Resolution_Chart_1956.svg). I hung it in portrait orientation and tried to aim right at the center point.

Portrait orientation means the central target forms horizontal lines. Right in the center, there are circles, but my tripod head doesn't allow for precision adjustments. I might not have aimed right at the center.

It seems very unlikely that I actually had the camera and the target perfectly aligned. But it might explain the problem with spot AF (vs. 1 point AF, which covers a larger area).

Repeating lines may give problems with autofocus, with any camera.  It's in the directions.

 ThrillaMozilla's gear list:ThrillaMozilla's gear list
Canon EOS Rebel SL1 Canon EOS M6 II Canon EF 400mm f/5.6L USM
Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow