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Switching back to R5... help needed

Started Jan 30, 2021 | Discussions thread
RDM5546
RDM5546 Senior Member • Posts: 3,654
Re: Switching back to R5... help needed

GatanoII wrote:

RDM5546 wrote:

I know the RF 100-500 is a magnificent wildlife lens but I use wildlike mainly the EF 100-400mm Mk II with the 1.4X and 2X Canon Mk III TCs that I had before the mirrorless cameras ( 5D Mk IV and 7D mk II). I have the Sigma 150-600 Contemporary with the 1.4X and 2X Sigma TCs as a alternative lens. I like both but the Canon 100-400 II is usually my first choice even though the maximum FL is shorter than the Sigma. The 45MP of the R5 allows for more cropping than my earlier cameras.

I also have the EF 400mmf2.8L IS but is a monster. Do you really have a 200-600/2.8 as this also must be a bigger monster. I have a Sigma 120-300mmf2.8 but use that more for outdoor sports that wildlife because I usually use it with a monopod.

Does the the Sigma 120-300mm works well (resolution/speed) with the 1.4x and 2.x TC and there is any improvement using Canon TC instead of Sigma? I have never seen a comparison of Canon vs Sigma tele converters with this lens.

I am happy with the extra reach over my EF70-200mmf2.8L IS III. The IQ is very good and about the same as 70-200mm. Heavier but can hand hold the SIgma 120-300mm and sometimes use tripod. When I had Canon 1.4X and 2X Mk III TCs then got the Sigma 1.4X & 2X TCs for specific use with the 120-300 and Sigma 150-600. I can not tell significant difference so far between the Canon and the Sigma TCs on these two Sigma telephotos. The Sigma 1.4X is better IQ and faster focus than 2X. The same with the Canon TCs on both. I got the Sigma TCs on sale for a good price so I thought I would give them a try. Now I use Sigma TCs on Sigma teles and Canon on Canon teles. Since they are not obviously worse matching lens with TC seems like it is reasonable. More over the colors of the TCs match the lens colors than way too. Sigma TCs are black.

I have never seen a detailed comparison test either. I am fairly sure the Sigma TCs were designed for the Sigma f2.8 prime tele lenses and not zooms like the 120-300 tele and the Canon for the Canon f2.8 prime tele lenses. With both my Canon and Sigma stopping down one stop for the 1.4X and two stops for the 2X seems to better than wide open but the improvement is small and needs lots of light. I have a EF400mmf2.8L IS and this excellent sharp prime does well with both 1.4X and 2X Canon Mk III TCs wide open. It my heaviest lens at 12 lbs and my most amazing magical image rendering lens.

I usually shoot the 400mmf2.8 using a gimbal on tripod.

I have been buying Canon glass for 39 years and sold on a few that I really did like.   Now I have many EF lenses and six RF lenses.   Most of my 20+ EF lenses work better on my R and R5 for most cases but will keep my 5D MkIV and 7D2 DSLRs forever.

 RDM5546's gear list:RDM5546's gear list
Canon RF 100-500mm F4.5-7.1L IS USM Canon G5 X II Canon EOS 70D Canon EOS 7D Mark II Canon EOS 5D Mark IV +47 more
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