RF 100-400 and teleconverter, same issue as 100-500?

Started 3 months ago | Discussions
Tr3v420 Forum Member • Posts: 80
RF 100-400 and teleconverter, same issue as 100-500?

Has there been any youtuber that mentioned whether or not the 100-400 will suffer the same 'unable to zoom down to 100' issue the 100-500 has?

pics53090 Forum Member • Posts: 52
Re: RF 100-400 and teleconverter, same issue as 100-500?
9

Tr3v420 wrote:

Has there been any youtuber that mentioned whether or not the 100-400 will suffer the same 'unable to zoom down to 100' issue the 100-500 has?

If you go to Canon's page and look at the specs for the lens, it has a section about Extender Compatibility. There it states that with RF1.4x it will be 140-560. I find the Canon site much more reliable than some Youtube so-called expert! Here is the link:

https://www.usa.canon.com/internet/portal/us/home/products/details/lenses/ef/telephoto/rf100-400mm-f-5-6-8-is-usm-lens

Wing2 Regular Member • Posts: 457
Re: RF 100-400 and teleconverter, same issue as 100-500?
1

pics53090 wrote:

Tr3v420 wrote:

Has there been any youtuber that mentioned whether or not the 100-400 will suffer the same 'unable to zoom down to 100' issue the 100-500 has?

If you go to Canon's page and look at the specs for the lens, it has a section about Extender Compatibility. There it states that with RF1.4x it will be 140-560. I find the Canon site much more reliable than some Youtube so-called expert! Here is the link:

https://www.usa.canon.com/internet/portal/us/home/products/details/lenses/ef/telephoto/rf100-400mm-f-5-6-8-is-usm-lens

The range between 140-400 is mainly for giving user the convenience that there is no need to remove the teleconverter if the scene was bright enough.

Another possible usage is giving user the extra magnification for shooting tele macro image.

The 2x converter sounds like a better match for lens with such wide zoom range

1.4x's main useful range is 400-560, 160mm extra reach

2x's main useful range is 400-800, 400mm extra reach

Yes, 2x is darker, but not a full stop darker between 400-560mm. According to CameraLabs.com's test, this lens has a f number of 7.1 from 156-259mm and f8 from 259 to 400mm

Sittatunga Veteran Member • Posts: 3,691
Re: RF 100-400 and teleconverter, same issue as 100-500?
1

pics53090 wrote:

Tr3v420 wrote:

Has there been any youtuber that mentioned whether or not the 100-400 will suffer the same 'unable to zoom down to 100' issue the 100-500 has?

If you go to Canon's page and look at the specs for the lens, it has a section about Extender Compatibility. There it states that with RF1.4x it will be 140-560. I find the Canon site much more reliable than some Youtube so-called expert! Here is the link:

https://www.usa.canon.com/internet/portal/us/home/products/details/lenses/ef/telephoto/rf100-400mm-f-5-6-8-is-usm-lens

The only incompatibility I can find is that the Store.Canon price for the 2x Extender is £20 more than the pre-order price for the lens.

John Sheehy Forum Pro • Posts: 25,212
Re: RF 100-400 and teleconverter, same issue as 100-500?
2

Wing2 wrote:

The 2x converter sounds like a better match for lens with such wide zoom range

1.4x's main useful range is 400-560, 160mm extra reach

2x's main useful range is 400-800, 400mm extra reach

Yes, 2x is darker, but not a full stop darker between 400-560mm. According to CameraLabs.com's test, this lens has a f number of 7.1 from 156-259mm and f8 from 259 to 400mm

Another way to look at those numbers is that without a TC, 400mm would have a maximum aperture of f/8; with a 1.4x 400mm would be about f/11.3 (8*1.414), and with a 2x, 400mm would be about f/14.254 (7.127*2).

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Wing2 Regular Member • Posts: 457
Re: RF 100-400 and teleconverter, same issue as 100-500?

John Sheehy wrote:

Wing2 wrote:

The 2x converter sounds like a better match for lens with such wide zoom range

1.4x's main useful range is 400-560, 160mm extra reach

2x's main useful range is 400-800, 400mm extra reach

Yes, 2x is darker, but not a full stop darker between 400-560mm. According to CameraLabs.com's test, this lens has a f number of 7.1 from 156-259mm and f8 from 259 to 400mm

Another way to look at those numbers is that without a TC, 400mm would have a maximum aperture of f/8; with a 1.4x 400mm would be about f/11.3 (8*1.414), and with a 2x, 400mm would be about f/14.254 (7.127*2).

I already pre-ordered this lens for some tele macro application. Am consider getting a tele-converter to further increase its magnification.

2x would give a 0.82 magnification that is quite near 1:1

On further study, I found the 2x converter could  actually be nearly as bright as 1.4x converter between 200-312mm range

This is lens is f5,6 between 100-113mm giving f11 at 200 to 226mm when 2x converter is added

The same zoom range when 1.4x is added the lens a between f6.3. and f7.1, giving f9-f10 brightness

Higgins2002
Higgins2002 Contributing Member • Posts: 731
Re: RF 100-400 and teleconverter, same issue as 100-500?

Tr3v420 wrote:

Has there been any youtuber that mentioned whether or not the 100-400 will suffer the same 'unable to zoom down to 100' issue the 100-500 has?

Canon site states for RF100-400:

A focal length range of 140mm (wide) through 560mm (tele) is possible to be achieved using the Extender RF1.4x.

For the RF100-500 it says:

*** Extenders can only be used from a 300-500mm range (cannot be used from 100-299mm).

 Higgins2002's gear list:Higgins2002's gear list
Canon EOS R5 Canon Extender EF 1.4x III Canon EF-S 10-18mm F4.5–5.6 IS STM Canon EF 100-400mm F4.5-5.6L IS II Canon RF 35mm F1.8 IS STM Macro +1 more
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