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DannyC71 · 02-13-2026

So I have the original EF 100-400 4.5-5.6 L IS USM lens, and already know that with the EF 2x Extender I can’t use autofocus because the maximum aperture is f/9. Does anyone know of a third party option that would still allow autofocus? The 400mm f/2...

DannyC71 · 05-15-2024

I have an R6 mark ii and have an EF 35-80 macro lens. I was trying some focus bracketing to make a focus stack. I set it for 150 images at the smallest increment. On the first try it only took 20 something images before it stopped, and on the second ...

DannyC71 · 02-14-2026

Years ago I had the Tamron G2 on a 6D Mark II and loved it, but when I went to the R7 the lens didn’t play well adapted to the mirrorless body. I went back to a DSLR and a Canon lens to simplify things, and now thinking trading in the 100-400 and goi...

DannyC71 · 02-14-2026

I’m using it on a 90D. I know I’m losing a ton of light but was looking for a temporary solution until I can afford something better.

DannyC71 · 05-16-2024

I had a feeling it was the lens, thank you!

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EF 100-400 4.5-5.6 L IS USM lens Teleconverter Compatibility

EOS R6 Mark II stops well short of focus bracketing image count

Re: Teleconverter Compatibility

Re: Teleconverter Compatibility

Re: R6 mark ii Focus Bracketing