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When you add a 1.4X converter it will still produce sharp images but will reveal more chromatic aberration (in some situations) with a Sigma converter than the Canon prime with a Canon converter. However the chromatic aberration can be managed with software. The manual focus ring is a fantastic size. I had to use it at one point when shooting handheld and in a low light situation where focusing was really tough.
Sigma 2.0x Teleconverter Review - Photography Life Sigma 2.0x Teleconverter Review - Photography Life
To me the built-in TC on a super tele lens literally redefines the category. It gives a very expensive lens a dual use flexibility: like owning two exotic primes for the price of one. The value proposition is high.
lens-db.com lists 4 versions of the sigma 300mm f2.8 apo starting in 1988 with the original MF version - rather similar to the tamron adaptall 60B 300mm f2.8. An AF version was introduced the same year, then a HSM EX version with 11 elements instead of 12 superceded the 1988 design in 1999. The last version was the more compact EX DG HSM introduced in 2005.
Sigma 120-300mm f/2.8 DG OS HSM S Lens Review - ePHOTOzine Sigma 120-300mm f/2.8 DG OS HSM S Lens Review - ePHOTOzine
As for weather sealing, it is also nice that Sigma is finally including a rubber gasket at the lens mount to prevent dust from entering the camera body and the lens. The gasket is pretty short though, so I hope Sigma will make it a tad longer in the future, similar to what Nikon does to make it more useful. The lens barrel itself is nicely made and will take on some beating and weather abuse. I am not sure if it will withstand a lot of rain, but I have used it in light rain without any problems. I believe this is one of the first Sigma lenses to get weather sealing (along with the new 12-24mm and 150mm f/2.8 macro lenses). Solid construction and pretty good optics, too. IQ and sharpnes pretty good wide open, and very good from f3,5 onwards. Pixel peepers may be able to find some minor purple fringing in areas of extreme contrast. But this is really insignificant, and can easily be corrected in post processing, should it be noticeable. AF works well thanks to the speed of the lens. Also with Sigmas 1,4 x and 2 x teleconverters. As usual, there is some loss of image quality, especially with the 2 x TC. With the lens set to its maximum aperture of f/2.8, there is significant light fall-off in the corners at both ends of the zoom range. Stopping-down to f/5.6 virtually eliminates this. There's very little distortion to worry about.Now your just contradicting yourself, first mirrorless ain’t necessary smaller as it has much to do with generation, then someone show that the 120-400 is latest generation Nikon and suddenly Nikon made an old generation in 2020 and those can make it much smaller. Contrary to any sort of evidence of the matter. I own this lens in the Pentax mount and used it for about two years. I then moved to Canon and bought the 300 IS and now the Caono 300 II lens. As expected with a 2x teleconverter, sharpness drops quite a bit across the frame, by about 25-30%. The lens is rather weak at the maximum aperture and pretty much requires stopping down to f/8 to get acceptably sharp images.
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