alphadog

I use now

Canon 5Dmkii
Canon 500mm f4 L lens + TC1.4x

Questons

1. IF I buy a R5
Can I still use the TC1.4x and an R adaptor ??

OR do I need to buy an R TC1.4x ???

2. IF I have an R adaptor and TC1.4x or R TC1.4x, what affect will they have on the speed of focus, DOF?

thanks for any insight, from someone who KNOWS... regards, richard

User ID

The TC is effectively part of the lens, so you can mount the assemblage on an SLR or on an EF to RF adapter all the same. DoF is not affected by the adapter. The AF may improve, given the advanced abilities of the R5 body, but that particular aspect is not in my experience ... except that I well know the feeble AF ability of my own 5Dmk2 so the R5 surely ought to be a real improvement. Even an RP ought to be a useful AF improvement.

DanielB Loc: San Diego, Ca

That, my friend, is a good question. You can definitely adapt the EF to RF using the RF adaptor (and that works flawlessly). I would think that since the adaptor communicates information from the EF lenses that that information would be passed through from the extender also...but I'm guessing. I would be more concerned with the overall length it adds to the body and the possible loss of f-stop (F4 to F8 or higher). I don't really know the math there.
I loose no f-stop with just the EF to RF adaptor with my EF lenses. In other words my EF 70-200 f2.8L IS II works great with my R5 with no loss of function or speed.
All that being said I would highly recommend the jump to the R5 regardless. I LOVE my R5. I even love my R even though I don't use it as much. This coming from a previous user of both the 5DII & III.

Good luck.

User ID

A 1.4 TC is only a one stop loss. If you are using a DoF calculator enter the *effective* aperture and FL values.

My recollection of other Canons is that the effective aperture is reported in the viewfinder readout. I gave up on TCs years ago.

Dik

EF TCs work perfectly with R bodies & adapters, RF TCs will not fit into EF to RF adapters.

mikegreenwald Loc: Illinois

The camera connects easily to the EF to RF adapter, and the 1.4X (EF to EF) tele-extender connects easily to the adapter and the EF lens. The effect on DOF is identical to that of a lens of 1.4 X the focal lens of the connected lens, and the loss of speed (f stop)is exactly one stop. The speed of AF is related mostly to the RF camera, much faster than the older EF style camera, but possibly limited by mechanical considerations, depending on what lens is connected.

Tomfl101 Loc: Mount Airy, MD

The R5 allows you to shoot in 1.6 crop sensor mode which I use frequently when shooting sports. I no longer use a TC. With 45 megapixels the 1.6 crop still leaves you with 17. This is more than enough for my purposes and with no f-stop loss it’s totally worth it. Of course I can just crop in post but I don’t usually have the time.

Capn_Dave

To answer number 1 Yes you can
To answer number two about 1 stop of light
I have used this with both the R5 and the R6 without a problem

DaveJ Loc: NE Missouri

Hi Alphadog,

#1. Yes, you can use the 1.4 and your 500 on the R5 with adaptor( I used an EF 300 f2.8 and a 1.4 or a 2x with great results on my R5)
#2 Your speed of focus will be at least as good as with your 5D MK II, but will probably be much faster and more accurate.

Dave

vidman64

Have you tried Canon Tech support.?.It is free, and 11 years ago, I used to be one of them, and we always had the answers or could get them. (Sorry I am not up to date on this situation, or I would help)
1-800-652-2666 Monday-Friday: 9:00 am to 9:00 pm Saturday: 9:00 am to 7:00 pm. If it is busy, best time to call is 2-3 in the afternoon, and NOT Monday am.

amfoto1 Loc: San Jose, Calif. USA

Considering we are talking about a 5D Mark II, that's not a very heavy lift.

The 5DII has a very primitive AF system. It's AF system is basically unchanged from the original 5D, which was intro'd in mid 2005. The APS-C Canon 20D (2004) used a quite similar AF system. It wasn't until the 5D Mark III (2012) that Canon would significantly upgrade the AF system.

5DII's AF system consists of 9 points visible in the viewfinder, within an oval that covers about 1/3 the image area. Only the center AF point is a higher performance and more sensitive dual axis type. There are also 6 hidden "assist" points that can be enabled, but only work in AI Servo mode. These points don't appear in the viewfinder, but essentially turn the circle etched in the center of the viewfinder into one big AF point (this circle indicates the spot metered area). When enabled the assist points add two more dual axis type. The optical viewfinder through a true pentaprism shows 95% of the image area. The 5DII's AF is "f/5.6 limited", meaning that it's unable to autofocus a lens/teleconverter combo with smaller than f/5.6 aperture. For example, it can autofocus a 500mm f/4 lens with a 1.4X teleconverter (a 700mm f/5.6 combo), but not a 500mm f/4 lens with a 2X TC (1000mm f/8 combo). The 5DII's AF is rated to work down to -0.5EV light levels. From my own experience with it, I felt it actually did a little better than that. I was able to get my 5DII to focus, albeit slowly and with some hunting, at light levels that other cameras rated to -1EV could not focus. (Granted, it might have been a problem or incorrect rating with the other camera. I certainly didn't do any scientific testing of this.)

In contrast, the R5's AF is close to the "latest and greatest" from any manufacturer (Canon R3, Sony A1 and possibly Nikon Z9 might be slightly better in some ways). It has 5940 "Dual Pixel CMOS AF points" covering almost the entire image area. Only the selected and/or active AF points are displayed. The camera is able to face and eye detect (humans and animals) and has very sticky tracking ability across the frame. The R5's electronic viewfinder (which can be set so you can see in very low light conditions) covers 100% of the image area, all the AF "points" are equal in performance. It is able to autofocus as low as -6EV (a moonless night, starlight only, away from city lights) and can autofocus f/8, f/11 and even f/16 lens/teleconverter combinations.

Further, the R5's "dual pixel AF points" are embedded directly in the camera's image sensor. In other words, they are on exactly the same plane as the image sensor. In contrast, a DSLR like the 5D Mark II has AF sensors that are separate from the image sensor. In fact, they are located in the bottom of the mirror box and light is redirected to them via a secondary mirror, after passing through a semi-transparent primary mirror (the mirror that reflects the image into the viewfinder). The light path to the DSLR's AF sensors must be calibrated as closely as possible to match the more direct path of light to the image sensor when a photo is taken. This is rarely perfect, but is why many modern digital cameras have means of fine tuning the AF for different lenses. The mirrorless camera with the AF sensors right in the image sensor itself eliminates need for this type of calibration, making for highly reliable focus accuracy. In modern mirrorless there also is no light "lost" to the semi-transparent mirror and "folded" light path used in DSLRs, which is why the mirrorless are able to autofocus in much lower lighting conditions. The more than five stop difference between -0.5EV and -6EV means to autofocus the R5 only needs roughly 3% of the light versus what the 5DII needs!

These differences are huge and are why the R5's AF system will amaze someone accustomed to a 5DII's!

And this is just the proverbial tip of the iceberg. Beyond the AF system there are a whole lot of other reasons the R5 would be a very big upgrade from a 5DII.

Canon R5 versus Canon 5D Mark II: https://cameradecision.com/compare/Canon-EOS-R5-vs-Canon-EOS-5D-Mark-II

NOTE: Rereading my response, sounds like I'm really trashing the 5DII... I'm not. There's one in my "go bag" right now, in fact. It's a true classic that revolutionized how Hollywood made movies and television shows. It's just that there have been huge strides made improving AF systems and other stuff over the last 17 or 18 years! Plus mirrorless can do things DSLRs never could.Yes, there are a few... very, very few... ways that DSLRs might still be preferred. But the positives of mirrorless greatly outweigh the few negatives.

DeanS Loc: Capital City area of North Carolina

I have a a 5D/IV, R5, and an RP. I use a t/c 1.4 and a 2.0 with EF lens interchangeably on all three bodies, no issues.

alphadog

Thanks for all the responses...

My camera is Canon 5DmkIII , not ii, my typo mistake...

I will call Canon hotline and see what they advise as well... thanks again for ALL responses...regards, Richard