smitty605 wrote:
Canon shooters: I just bought a Canon R6 with an adapter for using my EF lenses. Will I see a difference in my photos if I buy RF lenses to use with the R6 ? Or should I keep using my EF lenses with the adapter and save the money ?
You might well find that your EF lenses work BETTER adapted for the R6, than they did on your DSLR.
One reason is that lenses on mirrorless cameras don't require calibration, because the autofocus sensors are embedded directly in the image sensor, so they are on exactly the same plane as the image is being captured. (A DSLR use a mirror to redirect light to it's AF sensors that are usually located in the bottom of the camera's mirror box, separate from the image sensor... and there's opportunity for misalignment so that what the camera thinks is in focus actually isn't perfectly focused on the image plane.)
Other than that... autofocus speed is supposed to be at least as good... But the R6 also is able to focus in much lower light conditions than ANY of the Canon DSLRs. The very most capable of those DSLRs can focus to about -3EV light levels (approx. "moonlight"). The R6 and R5 are both good around -6EV (approx. "starlight"). Partly this is thanks to the light directly impinging upon the mirrorless camera's AF sensors, not having to pass through a semi-transparent mirror and be reflected by a second mirror the way it's done in DSLRs and where those mirrors reduce the amount of light that eventually reaches the sensors.
Add to this, the R6 has more than 1000 "AF points" that cover almost the entire image area, while the most any DSLR has is 150 points, but most have far less than that.... and they're relatively concentrated in the center third or quarter of the image area.
Plus, the R6 and R5 have in-body image stabilization, which combines with IS in lenses that have it, to offer incredible levels of assistance making shots in extremes that weren't possible before.
It's not a perfect world. Adding an adapter will make the lens larger and additional electronic contacts aren't likely to help performance, but all the above factors are likely to more than offset any minor loss.
And, RF lenses are the "latest and greatest" designs from Canon. Sure, many EF and EF-S lenses are excellent too... and a lot of them are well-proven. But Canon's R&D efforts are now focused on the mirrorless system. Eventually you may want to take advantage of the new lenses.... But no one is making you do so immediately.
Finally, there's choice of EF to RF adapters for use on Canon R-series: a plain one that's reasonably inexpensive, another that adds a user programmable control ring (much like is found on many RF lenses), and a third type that allows drop-in filters to be placed behind the lens (which might prove very useful with some lenses that are otherwise difficult to filter). In some cases (such as ultrawide Tilt-Shift), given a choice I might even opt for an adapted EF mount lens instead of an RF lens, to be able to take advantage of drop-in filters.