R5 lunar photography with stacked EF extenders

Started Dec 14, 2021 | Discussions thread
OP Bigger Contributing Member • Posts: 664
Re: How did you stack the EF 2x III and EF 1.4x III
1

Larry Rexley wrote:

The teleconverters are transparent to the camera, they just report the lens mounted on the teleconverters, even when stacked. Everything works including autofocus and image stabilization.

The teleconverters are not completely transparent for the R5/R6. They need to know the FL to do proper IBIS. So, the fact that the R5 can't multiply FL by the RF TC ratio could affect IBIS coordination. Probably won't make a big difference with a great white lens since most IS is done in the lens. But could be an issue if you adapt a shorter lens.

With the EF teleconverters, they just report the attached lens to the body, but only for one TC. The second, stacked EF TC is invisible to the body. For the RF TC, this is not the case. The body can see both, but the R5 camera firmware doesn't account for them in the FL calculation.

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