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That's a very welcome addition! Let the (lens manufacturers) competition beginThat's the problem with 3rd party manufacturers.
I'd say this is the problem with *2nd* party manufacturers (I guess the 1st party is us, the customers) - it would be no surprise if Canon, Nikon or whatever changes specs and didn't open their protocols just to +1 their own equipment. Luckily, the 3rd party just got smarter and Sigma now has an usb dock for lens fw updates...
Actually there is crop factor:Maybe because it would be the equivalent of much more mm (actually 640) on a 1.6x crop body and some need it?EF-S 400 4 IS
Why not try the EF 300mm f/4L IS, as it is the equivalent of 480mm on a 1.6x crop body?
No, a theoretical EF-S 400mm lens on a 1.6x crop body would be the equivalent of 400mm. Note: EF-S lenses, which is what the OP requested, can only be mounted on a 1.6x crop body, so there is no crop factor.
Finally I found time to test my 5D3 with a 300mm f/4 (non-iS) lens with EF2X II teleconverter.More information about "not much light"
The test was inside my house and not much light.
It worked fine
I was surprised that Canon hadn't included f/8 AF on that body right from the start. Perhaps they needed to iron out some issues first, I don't know.+1 Same with the 1DX. As it was replacing 1D4 (at least!) it was very strange that they omitted this feature initially.
I don't like being an "early adopter" (although this firmware update is not exactly a totally new thing), but reading these comments has convinced me to go ahead and install it.Firmware seems fine
Just read the instructions. The part at the end that says to remove the battery for a few seconds seems new to me. I remember members of this forum mentioning the same thing for the 7D upgrade but I do not remember this instruction for the 5DMkII firmware updates. That's interesting for Kenko! However, everyone who had Canon teleconverters could not have this option!Someone please explain this f/8 brouhaha to me: my 5D3 + Kenko 1.4x tele-extender + 400 & 70-300 auto-focus (at f/8, pre-firmware update) all day long. I just downloaded the firmware update and will install it later today, but I've been auto-focusing just fine at f/8 for some time. Am I missing something?
You are missing ... Canon teleconverters which report the correct maximum aperture to camera.
When you put kenco with your say 400 f/5.6 lens does it report it as having a maximum f/8 aperture? I guess not! It still reports it as f/5.6!
You have effectively a 1.4X400 = 560mm f/8 lens but the camera thinks it is connected to a f/5.6 maximum aperture lens and tries to autofocus!
When my Kenko is attached to my EF 400 f/5.6 lens, the 5D3 tells me that the max aperture available is f/8. It auto-focuses just fine (I used it that way between my last post and this post). The EXIF data in Lightroom lists the lens as the EF 400 f/5.6, but the images display the correct EXIF data: f/8. So, tron, maybe I'm still not seeing something, but this all jives.
Someone please explain this f/8 brouhaha to me: my 5D3 + Kenko 1.4x tele-extender + 400 & 70-300 auto-focus (at f/8, pre-firmware update) all day long. I just downloaded the firmware update and will install it later today, but I've been auto-focusing just fine at f/8 for some time. Am I missing something?
I would LOVE to see the return of DO lenses, Got to use a 400 f/4 DO today and it was a joy, the contrast/color is a bit off but super easy to fix in post.+100000 !!!!
If I could afford it, I would preorder the 200-400 but that is not an option(My Wife clarified that for me).Does she have the same hard feelings for EF500 f/4L IS II ?
OP seems to have one camera so that would cause lens change more often. Still it remains an interesting combination...Right now, I am planning to bring my 70-200 f/4 IS, my 24-104, and my 17-40.
Do you really need to fill that 40-70mm gap? 17-40L + 70-200/4L IS could be enough.