Re: EF 16-35mm f/2.8L III & EF 24-105mm f/4L IS II Images & Specifications
I've been using the 24-105mm F/4 L IS as a video lens for ages and it's just a workhorse of a lens. This lens has been a de-facto standard for video shooters on the 5D series era and on the C100/C300 as an all rounder ''doc'' lens.
Mine lived on my 5DII and 60D (great range for both sensor sizes from wide to tele) and the lens alone carried my video production company, it's specifically ultimately exceptional in video Image Stabilisation unlike any other Canon lens, but sadly one time the tripod fell off and the hit was right to the extended lens barrel. It was stuck/fixed, seemed like something easy to fix, but I found out it was officially dead and repair exceeds the cost of a new one. So it lives now as room decoration.
Since I moved from Full Frame video and lost the 24-105mm. I found an alternative in the absolutely brilliant Canon 18-135mm IS. It's only APS-C (so only 60D, C100, C300, not 5D, which I sold and it got outdated in the video world).
And I found that little gem to be better in every single way including image quality except for build quality/feel and constant f/4 aperture.
But the 24-105mm wasn't ACTUALLY a constant aperture lens, it got darker whilst zooming during video, not much different from the variable 18-135mm oddly. So that was a strange downside with the lens, I thought I was the only one with a bad copy but it turns out this was documented and reported by all video shooters.
The 18-135mm has a larger range and wider for APS-C (which is the standard for video/cinema), less distortion at 24mm, similar/identical sharpness, same overall image, slightly better image stabilisation, silent AF and IS and Iris, and smaller/lighter weight and cost.
The 24-105mm has Full frame coverage shall you need it, constant f/4, and L series build quality, for a very low price point.
I'd ditch the 18-135mm and get this new lens if it has a few things. Most importantly, image quality. The 24-105mm and 18-135mm are great lenses and do very good 2mp 1080p video, but when you pop on a Canon 50mm f/1.8 and look at the image both set at f/4, it just hits you how much POP and cleaner colour and 3d dimension feel these primes have. This aesthetic is in the Canon 70-200mm f/2.8 II IS and 24-70mm F/2.8. One might think that at at 1080p HD the resolution increase in the lens wouldn't show up but it does, significantly.
So for me it needs to be:
1- Sharper. Higher resolution. Just get more of that POP it lacks compared to primes and other L glass.
2- Less Distortion at wide shots. It's hideous. In photography you can correct it but in video, not so much.
3- Doesn't ramp aperture/transmission while zooming from 24mm to 105mm like a normal constant should.