EOS RP vs. Fujifilm XE1 using Canon 70-200 F4L II + Lens Turbo II + 1.4 extender

Fujifilm XE-1: Supercharged and Speedboosted vs. Full Frame Native    

Fujifilm XE-1 + Lens Turbo II - Canon 70-200 F4L IS Version II

Here's a quick comparison of something I always wanted to do: compare extremely high quality glass on full frame vs. aps-c, however instead of putting said glass on the XE-1 "dumb style" using open air, I wanted to equalize it with full frame as much as possible by correcting the projection using a Mitakon Zhongyi Lens Turbo II (aka speed booster or focal reducer)  Using the focal reducer isn't an exact 1:1 conversion but pretty darn close.  Zhongyi quotes a crop factor of 0.73x.  So 200mm on APS-C would be 300mm, but corrected with a focal reducer on Fujifilm, yields approximately 219mm F.4.3.  In trying to match 200mm F4 in this case, it's close enough.  Full frame still technically wins but as you can see below, the Fujifilm does surprisingly well considering I just added extra glass elements to the equation for which this Canon lens was clearly not designed for.  This shows how much power XTRANS technology yields.  A highly regarded photography site quoted the XE-1 as having 24mp equivalence due to its XTRANS technology, despite being rated at 16mp. I believe it.  Here you can see how it compares with Canon full frame at 26mp!

Bonus: I tested a Canon 1.4x converter on both cameras for 280mm on the Canon EOS RP, and 306mm on the X-E1.  This results in a f/5.6 and f/6.1 aperture and light gathering ability (in terms of FF equivalence) respectively.

1) Overall shot @ 200mm using just the Canon 70-200mm F/4L IS II @ 200mm F4.  EOS RP on the left, XE-1 + Lens Turbo II on the right.  200mm F/4 and 219mm F/4.3, respectively after proper conversion.  (For all intents and purposes, equivalent).  Note: The XE-1 RAW files did NOT come out as pictured below.  Exposure and white balance adjusted to match Canon.  The Fuji files came out dark and pink whereas the Canon files came out looking vibrant and strong as below.  A testament to Canon colors!  Still, the Fuji files can easily be matched in post with no penalty.

Center crop 1:1.  The Fujifilm XE1 is holding its own despite having extra glass jammed between the lens! Bravo XTRANS!!

Next up, same exact setup except this time with Canon's 1.4x extender for 280mm on the EOS RP and 306mm on the Fujifilm after taking into account the Lens Turbo II conversion.  

At 1:1, the results look quite similar in the middle. Impressive. I may even give the slight edge to Fujifilm, but keep in mind it's also magnified more.  So call it a wash.

And in case you're wondering how they compare on the very edge, very similarly.  Again, Fujifilm appears sharper, perhaps due to being more "zoomed in" at 306mm vs. 280.  Impressive!

Of course, the Lens Turbo II lacks aperture control and autofocus, this is just a test of optics. However, this particular Canon 70-200 F4L IS II is Canon's latest and greatest of their legendary 70-200 F4 lineup, so it has optics to match 50mp sensors.  So it performs stellar wide open which makes it perfect for situations where you're stuck with the largest aperture.  

Next I may try my Fujifilm X-T3 which should produce even more impressive results!