The Bolt VD-410 is my pick for the best budget manual flash compatible with the Canon 6D Mark II. It provides very simple operation with solid performance at a very reasonable price tag. It comes with a decent guide number of 124.7′ at ISO 100. It works as an on camera or off camera trigger flash. Canon 6D Mark II DSLR Camera With PRO GRADE LENSES (24-105mm USM and 50mm 1.4) Opens in a new window or tab. Pre-Owned · Canon EOS · Digital SLR. 5.0 out of 5 stars. Image Quality: 6D II delivers nice images, but it has some problems . Sharpness. The Canon 6D Mark II comes equipped with a brand-new 26.2-megapixel full-frame image sensor. I used the 5D Mark IV- downgraded to a 6D mark II when I moved states, then just recently bought the EOS R. And I would absolutely upgrade to the R. The eye autofocus, new lenses, old lenses with the adapter are all amazing. I like the feel of the camera better and the quality of the photos im getting are just a little bit better IMO. AfKu.