Canon Extender EF 2x III

I bought this extender some time ago and never really used it as the resulting images were disappointing too soft. However through neccesity I recently tried it with my 1dx mk2 and my 600mm mk2 and was surprised with the quality, I have since tried it...

I have just bought this and very disappointed. I wanted it for my 1DS mkii to use on my 100 - 400 mk ii L series lens but the auto focus dosent work when I attached the extender.

ok I've given this a few tries now. I know that you can't use this extender with the aperture wide open. Despite trying various settings I've found getting a clear image from it very difficult, you need to up the aperture to have half a chance, which...

Very.co.uk said delivery would be about 6 weeks, but this arrived within a week, so very impressed by this. I attach this to my 70-200mm f2.8 is 2 lens to get 400mm and the quality surpasses expectations, considering I would have to pay two grand for a...