The bulbous Canon 17mm f 4 L Tilt-Shift lens turns into a 13 mm lens. Its borders are slightly less sharp - due to a slight optical curvature at the borders. (I will test, how things perform when i set the sharpness at the borders, and then see if the center is still sharp). However, this lens is likely less useful for true professionals who demand simply the highest quality.

However, for me personally - the very slight blur at the borders - are easily be addressed with Topaz Sharpen AI. It works flawless in that regard - or in other words - the details turned out very sharp again ! So, I really do not complain, because that means the TSE 17 L becomes another bonus lens for my Fuji GFX camera system.

Ultra wide, in fact. I really didn't see that coming.

The image above is unshifted - so there is still heard room left to shift the lens into all directions with up to 8 mm (according to what I have read in other Fuji related forums). Naturally the shift headroom is less on a Fuji 33x44 mm sensor - compared to a fullframe 24x36mm sensor, for which this lens was designed for.


Watch out ! Camera RAW profiles for Canon TSE 17 mm f 4 L
when used on Fuji GFX cameras with a larger sensor

I noticed that when the profile for the Canon TSE 17 mm f 4 L lens is enabled, it looks slightly worse. Mainly because the lenses (some of them) behave differently when used on a Fuji GFX sensor. Also worth to keep in mind, that the sensor glass is very thick in the Fuji GFX, around 4.2 mm - which is like a Micro Four Thirds lens. All other cameras have less thick glass. Leica M8 has the thinnest of them all - 0.5 mm. The Leica M9 has 1.0 mm thickness. Sony I don't know, but has at least 2.5 mm or more in thickness. Fuji GFX is among the ones with the thickest sensor glass that I know of.

Sensor glass thickness highly affects optical performance of lenses ! Especially in the borders. Lens design also plays a vital part in how a lens performs. The shorter the lens, the worse the corners. That's why Leica lenses often perform very bad on Sony cameras. And on Fuji GFX cameras due to the thick sensor glass.

Newer sensors are back illuminated and have shown to create a better tolerance when adapting other lenses - creating far less color tints in the corners. Smearing in the borders and in the extreme corner is still a problem for other brand lenses.

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