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F11 lens with 2x TC = F22?

Started Aug 5, 2020 | Questions thread
Sittatunga Veteran Member • Posts: 5,406
Re: F11 lens with 2x TC = F22?

Terry Danks wrote:

I am happy with what I am getting with my RF800 f/11 on my EOS R as is.

I will not consider putting a 2X extender on it . . . ever! That, IMO, is a bridge WAY too far on an already very slow lens.

I do not have an RF1.4X and have no immediate intention of getting one . . . but "never say never!"

The "shortcoming" with the RF800 is, IMO, its closet focusing distance being 6m. Instead on an extender, to make those small birds bigger, (my concern), I have ordered a 35mm extension tube which will allow the lens to focus at about 15 feet. Of course infinity focus will be lost, but, to my purpose, that is not a big deal.

Same loss of light, more or less, but a better solution than an extender IMO, for close subjects.

I was never happy with 2X extenders anyway . . . on ANY lens, even the mighty EF600 f/4.0!

Geometrically it should be a lot less light loss, I'll be interested to see what you find it really is.

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