What I would do to get something more usable at a comparatively low price is to get a used or Canon "refurbished" EF 16-35 f/4.0 which is far superior to the 17-40 in every way and holds up on the R5 very well. This is my experience having had the 17-40 and two generations of the EF 16-35 f/2.8. I kept my EF 16-35 f/4.0 when I transitioned to the R system, and even after trying the new 15-35 f/2.8, have no desire to trade away my 16-35 f/4.0. It works great for my needs with the adapter and is working very well with the 45 MP of the R5. then the 16-35 L II is a better choice (you need at least f/2.8 - or image stabilization for motionless subjects).

He took his staff in his hand, and chose for himself five smooth stones out of the brook, and put them in the pouch of his shepherd’s bag which he had. His sling was in his hand; and he came near to the Philistine. Hot Extra 5% - 10% Savings Payboo Deal at B&H ends Tomorrow – Canon EOS R5, R3, and Many Other Items Included! Barely any of the major third party manufacturers currently offer a lens covering this range that will cover a full frame sensor as Sigma and Tamron have discontinued their 17-35mm offerings.

Apochromatic lenses have special lens elements (aspheric, extra-low dispersion etc) to minimize the problem, hence they usually cost more.

Used on a 1.3x camera it gives angles of view similar to what a 21-50mm lens would give on a 35mm film camera. On a 1.6x camera it gives angles of view similar to what a 28-65mm lens would give on a 35mm film camera. o What I mean, brothers and sisters, is that the time is short. ( O) From now on those who have wives should live as if they do not; 30 those who mourn, as if they did not; those who are happy, as if they were not; those who buy something, as if it were not theirs to keep; 31 those who use the things of the world, as if not engrossed in them. For this world in its present form is passing away. ( P) The 17-40mm f/4 L is a better, lighter and newer lens than the fatter and more expensive 16-35mm. (I still look forward to trying the even more expensive and heavier 16-35mm f/2.8 L II.) delivers significant (macro-realm) .83x and 1.02x maximum magnifications for 12mm and 25mm tubes respectively. Now there is the comaprism for the longest focal length on the Canon 10-18 and at roughly 29mm on the Canon 17-40L. We have to consider the at 18mm the maximum aparture is 5.6 on the Canon 10-18mm and almost every lens will increase overall sharpness by closing the aparture 1 or 2 steps. And even here the 18mm are useable with 5.6.

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And there you have it! Two different ways to convert 17/40 to a percentage. Both are pretty straightforward and easy to do, but I personally prefer the convert to decimal method as it takes less steps.