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General observations of 90D, R100, R10.

TomSchriefer
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p.1 #1 · General observations of 90D, R100, R10.

I am a bit of an old geezer around here. I used film exclusively until 2008, so I was a bit late to digital. If it matters, that puts me at about 40 years of film. Amateur/hobbyist stuff only.
My latest/last DSLR is the EOS 90D, which I am quite comfortable with. Last year, I bought an R10. I wanted to like it, but just could not. Too small, EVF simply sucks. Too many options for an old filmster for me. I sold it. Last December, I was bitten again, this time by the R100. I put some effort into a real comparison between the R100 and my 90D.
The 90D just feels better in my hands.

I am not sure how this is possible, but the R100 runs circles around the 90D for AF. That surprised me because they both use the same DIGIC 8 processor. I guess it is due to the sensor. I grew to like the R100 enough to get familiar with its shortcomings. Namely, no touch screen, BBAF is very difficult to use, and the burst rate is absolutely Byzantine. I like the R100, but it is a snap-shooter/casual shooting camera for me.

Soooooooo... I bought another R10. After a week or two of pushing it around, I have come to really like the R10. Handling, controls, options, configurability, everything. It is a way better camera (for me) than the R100. The DPAF II is quite amazing. The configurability of it is amazing. AF Cases and SUBJECT to track make it easy to use how I want to use it, in different situations. OK, I am keeping this one.

Now I am down to 90D vs R100. Which to keep? The biggest downside of the R100 is the difficulty of BBAF. It does everything else I want a cheap, throw-in-the-bag camera to do. Surprisingly, after a few months with the R10/100, the biggest downside of the 90D is its size. The damn thing is HUGE compared to the other 2. I mentioned selling it to an acquaintance, and he said, what about using the R10/100 with you long(er) lenses? So I put the Sigma 150-600mm C on the R10. Guess what? I don't hold that combo (or 90D w/this lens) by the camera. I hold it by the lens! Argument avoided.

Before officially deciding to sell the 90D, I had to make sure the Rs worked well with my lens collection. Check. Everything works fine. I expected no difficulties with the EF lenses, and got none. Other 3rd party lenses are Sigma 8-16mm II, and the 150-600, and a Tokina 12-28 f/4. I really like the Tokina, and it works just fine, though the AF seems a bit noisier on the R100. Which leaves me where? It leaves me with a 90D which is now my least favorite camera. I know I don't need three cameras, but the 90D has been my buddy for more than 5 years. It feels a bit like taking a dog to the vet for the last time. I am struggling to let it go. Perhaps I should keep it as along as I am using EF glass. Then again, I don't see any RF glass worth selling my EF stuff for.

No question. Just some thoughts.

Apr 19, 2026 at 03:15 PM

EB-1
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p.1 #2 · General observations of 90D, R100, R10.

My problem with the 90D is the mirror slap and shutter shock with long lenses. It's worse than the R7 which only has the shutter. The R100 has a lower res sensor.
I do recall that the 90D has such small pixels that the lenses need to be calibrated, so make sure that AF accuracy is optimized. I stopped using it after the R7. I have a whole bunch of old Canon croppers hardly used, mostly as an extra reach body. None were very good, though the 7D II waas the best of them.

I started with BBF on the EOS 3 and still use it often. You don't need it so much with the MILS if subject can be detected, but for inanimate ojects where you don't want it to refocus.

EBH

Apr 19, 2026 at 03:59 PM

Gochugogi
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p.1 #3 · General observations of 90D, R100, R10.

I loved my 90D: it was the last and best of its line and, in video and live view modes, an able mirrorless camera, on par with the M6 MK II. I mostly used mine to shoot 4K video. Movie servo was very good and the 90D's early rendition of eye focus kept it locked on my eye or head while playing guitar. In the optical viewfinder mode, it basically used 80D AF tech. It was fine in one-shot mode for travel and landscape but underwhelming for tracking action with AI servo. Once I bought an R7, my 90D hit the auction block, as the R7 ran circles around it in terms of AF tracking and speed. Oddly, 90D AF was better than the R7 in one regard: the cross AF sensors could lock on white clouds and horizontal line patterns. With the R7 and R6 MK II in those situations, I have to tilt the camera, lock AF on a substitute object at a similar distance or use MF.

Apr 19, 2026 at 05:42 PM

Jeff Nolten
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p.1 #4 · General observations of 90D, R100, R10.

The 90D and R7 have the same sensor. The 90D only uses sensor AF in live view while through the viewfinder it is using a separate AF sensor. This may be obvious but worth mentioning. Mirrorless uses the sensor all the time. R10 and even the R100 have many more AF sensor sites (pixels) to work with than the 90D through the viewfinder. Still I had no issues with 90D AF on any of my EF lenses. I'm sure that the sensor based AF was much more mature by the time the APS-C R bodies were released.

I bought the R7 to upgrade my M6II (same 32 MP sensor) but better lenses like the RF 100-400. Overall the functionality of the R7 was so much better than the 90D that it motivated me to transition completely to the RF system including trading the 5D4 for the R5 and RF lenses.

EBH mentioned 90D mirror slap and shutter being loud and causing shutter shock. I just dug out my old Elan 2e to give my granddaughter to try film. I last used the camera in 2001. A new battery got it working again. Its shutter sound is so loud it could cause a stampede.

Of course no one knew about shutter shock back then, I never heard about it for the EF bodies like the 90D either. I first heard about it with the M bodies and much more so with the R bodies. I generally use EFCS but have seen no issues in my use.

[Edit: Peter, our posts were simultaneous.]

Apr 19, 2026 at 05:48 PM

TomSchriefer
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p.1 #5 · General observations of 90D, R100, R10.

Mirror slap and shutter shock became issues when cameras without mirrors and shutters became a thing. I'll take the shutter shock over the rolling shutter thing every time.

Apr 19, 2026 at 07:41 PM

Jeff Nolten
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p.1 #6 · General observations of 90D, R100, R10.

TomSchriefer wrote:
Mirror slap and shutter shock became issues when cameras without mirrors and shutters became a thing.

Ya, still don't get the why.

Course, I don't think there's logic in it.

Apr 19, 2026 at 08:04 PM

Gochugogi
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p.1 #7 · General observations of 90D, R100, R10.

I didn't notice any shutter vibration problems with my 90D. Oddly, certain older lenses seem to resonate or amplify shutter vibration on the R7. My RF lenses are fine but my old EF-S 17-55 2.8 IS USM exhibited strong shutter shock on the R7. It was only useable with E-shutter. When I swapped it out for the RF-S 18-150, there was zero shutter shock with mechanical shutter.

Apr 19, 2026 at 08:12 PM

CharleyL
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p.1 #8 · General observations of 90D, R100, R10.

I have a 90D, and two 77D DSLR cameras. I haven't yet bought a mirrorless camera, and I may not. My retirement budget for photography is much smaller now, and the mirrorless cameras are becoming financially out of reach for me for the models that I might be interested in. I haven't been comfortable using the ones that I've tried so far either. So for now, I will continue using the DSLRs that I have.

I also have an older Fuji 16 mega pixel with a non removable zoom lens. In the past 6 years it has mostly been my emergency backup camera, and spends much of it's time in the back of my car, waiting for me to need it during shoots like weddings and such, when having no backup camera is totally unacceptable. It's always in the car and ready for me when I find that I really need it. I have photographed a few accidents with it, sometimes a few shots while visiting friends, or that beautiful Sunset that pops up briefly and then is gone, but my cell phone camera is now 60 megapixel, so quick pop-up shots are now frequently caught on the cell phone. Still, that old reliable Fuji has it's place in my life, and it has saved the day many times in it's life.

So, why do I have two 77D cameras? I was doing weddings and a 32-70 lens on one and a 70 - 300 lens on the other let me switch quickly to get the close-ups, and switch again to catch things happening on the other side. Having two identical cameras with a long lens on one and short lens on the other got more of the good shots, both near and far, but now as I age I'm discovering that I am no longer as agile, nor can I stand for long periods, and both are required for wedding shoots. One of the 77D cameras now has a Tamron 18-400 lens on it and it has become my out of studio camera for almost everything. I would only be carrying one camera with this lens for weddings if I was still doing them. It's an amazing lens. I wish I had that Tamron lens back when I was doing the weddings, as I wouldn't have needed the second 77D.

The 90D has become my main studio camera, and is usually mounted to one of my 6' camera stands. It tends to be too big and too heavy for me to carry for long periods in my advancing age now, but I frequently remove it from the camera stand and hand hold it part of the time when doing studio shoots, but it tends to be too big and uncomfortable for me now when I'm holding it in my hands.

So, that second 77D - It has become one of my video cameras. It's in a cage now and this lets me hang the wireless mic receiver, or a shotgun mic, two LED lights, and a H1N audio recorder for backup audio. It also has a 7" 5G display screen on it.

I also have a Minolta Pro video camera, but tend to use the #2 77D for most of my interview and up close video work, and the Minolta tends to be my studio or backup video camera. I've had it about a year, but I'm still not comfortable using the Minolta for much, and though I've added brackets and ways to hang the wireless mic receiver, or shotgun mic, the LED lights, H1N backup audio, and 7" display, I still haven't found a comfortable arrangement of these to make using it this way something that feels right for me.

Charley

Apr 19, 2026 at 09:42 PM

EB-1
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p.1 #9 · General observations of 90D, R100, R10.

TomSchriefer wrote:
Mirror slap and shutter shock became issues when cameras without mirrors and shutters became a thing. I'll take the shutter shock over the rolling shutter thing every time.

Actually the issue existed but I did not realize the problem. I have many images with the 90D and 500/4 II w/1.4x III that were not quite sharp and I didn't figure it out for a long time.

EBH

Apr 19, 2026 at 10:14 PM

MintMar
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p.1 #10 · General observations of 90D, R100, R10.

I went from 6D to R6/2 just for the AF and IBIS, and it it was a good move. I do miss OVF sometimes, but overall everything improved. Similarly I went from SL2 to R10 (sans IBIS, of course). I don't think I'll be ever looking back. I kept the DSLRs, for the less likely situation that I'd need/want 2 cameras, but that's all.

At least Canon has been somewhat helping with reducing the types of batteries so I kept all the old batteries and chargers when I went from EF to RF. I do keep my EF lens collection (it's actually expanding, since people apparently think that RF glass should be better and they're dumping their old EF glass on the second hand market), I basically have a mirrorless EF cameras, I bought one EF-RF convertor per RF camera and they're kinda part of the cameras for me.

The only exception to the above is the RF 800/11 which has no equivalent in the EF world.

Now that I think of it, a battery life did not improve with the EF-RF transition. I run the RF EVFs at the highest speeds.

Apr 20, 2026 at 04:10 AM

jgoetz4
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p.1 #11 · General observations of 90D, R100, R10.

MintMar wrote:
I went from 6D to R6/2 just for the AF and IBIS, and it it was a good move. I do miss OVF sometimes, but overall everything improved. Similarly I went from SL2 to R10 (sans IBIS, of course). I don't think I'll be ever looking back. I kept the DSLRs, for the less likely situation that I'd need/want 2 cameras, but that's all.

At least Canon has been somewhat helping with reducing the types of batteries so I kept all the old batteries and chargers when I went from EF to RF. I do keep my EF lens collection (it's...Show more →

There are some good deals for used EF glass on the B/S Forum. For example, there is one member selling the EF 35 2.0 lens for $85.
Jim

Apr 20, 2026 at 05:12 AM

TomSchriefer
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p.1 #12 · General observations of 90D, R100, R10.

EB-1 wrote:
Actually the issue existed but I did not realize the problem. I have many images with the 90D and 500/4 II w/1.4x III that were not quite sharp and I didn't figure it out for a long time.

EBH

Your 500/4+1.4 setup is heavier and longer than my Sigma 150-600 (no TC). I think for the price of your glass, you have a right to expect as much as possible from your camera. I am not in that league.

Apr 20, 2026 at 06:51 AM

TomSchriefer
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p.1 #13 · General observations of 90D, R100, R10.

CharleyL wrote:
...

The 90D has become my main studio camera, and is usually mounted to one of my 6' camera stands. It tends to be too big and too heavy for me to carry for long periods in my advancing age now, but I frequently remove it from the camera stand and hand hold it part of the time when doing studio shoots, but it tends to be too big and uncomfortable for me now when I'm holding it in my hands.

...

Charley

I get you. The 90D now feels big, and heavy. I am retired and sneaking up on 70 so small and light is good. The 90D will be sold, shortly. I don't need a dedicated studio camera. I don't see buying a bunch of RF glass. My EF lenses work well with the adapter. And there is no equivalent to either my 8-16, or my 12-28, near as I can tell.

Apr 20, 2026 at 06:58 AM

CharleyL
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p.1 #14 · General observations of 90D, R100, R10.

@Tom,

At 70 you are just a kid. I'm 84 now, have had 10 heart surgeries, and only last year started using the 90D as the main studio camera. I've been lugging it around in a backpack camera bag for several years before deciding to go back to the 77D for my out-of-studio shoots. The 77D is what I'm taking to my monthly camera club meetings now too, and prints from it look better than some I've seen that were taken with new mirrorless cameras by other club members. Another reason why I haven't gone mirrorless is that I learned many years ago not to go with a new and radically changed model of anything, and wait a year or two for the bugs to be worked out. The learning experience came with a car and the first year that the model was offered (no, it wasn't an Edsel), but similar thoughts apply.
My present cameras are all less than 5 years old too. Why change everything, lenses and all to go with the latest New Thing?

Charley

Apr 20, 2026 at 10:04 AM

MintMar
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p.1 #15 · General observations of 90D, R100, R10.

CharleyL wrote:
(...)
Another reason why I haven't gone mirrorless is that I learned many years ago not to go with a new and radically changed model of anything, and wait a year or two for the bugs to be worked out.
(...)
Charley

The mirrorless is not as radical change as you may think. It's been tested quite a lot on many DSLRs as "live view".

Apr 20, 2026 at 10:28 AM

Gochugogi
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p.1 #16 · General observations of 90D, R100, R10.

MintMar wrote:
The mirrorless is not as radical change as you may think. It's been tested quite a lot on many DSLRs as "live view".

I don't think many DSLR users even knew their camera had a viewfinder. Even nearly two decades ago I constantly saw people using their Rebel/Kiss models only in live view. Plus, LV doesn't mess up makeup and is natural for the smartphone generation.

Apr 20, 2026 at 12:24 PM

TomSchriefer
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p.1 #17 · General observations of 90D, R100, R10.

For what its worth, I put the 90D on E-Bay a few hours ago. I posted it for slightly above the average of the last 10 sales. It sold in less than an hour... for full asking price. Perhaps I do need a rf lens

Apr 20, 2026 at 06:39 PM

Jeff Nolten
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p.1 #18 · General observations of 90D, R100, R10.

I've found the RF lenses better their EF counterparts. The RF 100-500 has been eye poppingly sharp on my R5 and weighs 1/2 pound less than the EF 100-400 II. The RF 100-400 weighs 1.5 lbs, so 2 lbs less, and though slow is great in daylight. The RF 70-200 f4 is quite compact. The RF 35 f1.8 goes 1:2. The RF 16f2.8 doesn't exist as EF. I think my RF 24-105 f4 L is sharper through the range than my original EF 24-105 which I was very happy with. The RF 14-35 f4 L besides being 14 also focuses closer. The RF-S 18-150 is very sharp through its range and focuses very close - a great field lens for critters, landscapes, and flowers, etc. The two Sigma f2.8 zooms are very good and benefit from the R7's IBIS. Sigma also has a bunch of f1.4 RF-S primes if you are into that.

There aren't RF-S equivalents for the 35 f2.8 1:1 macro with ring light or the 60 f2.8 1:1 macro but I use these with the adapter just fine. The R7's IBIS is great with the 60. So after a year and a half now with the RF transition I'm very happy.

Now I've never ventured into the f1.2 L category nor the big white primes so I can't speak to those. I understand that the two f11 primes and 200-600 zoom work well now that f5.6 or 8 isn't a limiting factor but again ...

Apr 20, 2026 at 07:47 PM

EB-1
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p.1 #19 · General observations of 90D, R100, R10.

The 100-400 II and 100-500 weigh within 10-20 grams of each other in shooting configuration.
Of course the 100-500 is a bit better and has a very useful extra 100mm, but the 100-400 II is quite good with the 50MP 5Ds/R for which it was designed. The two 100-400 IIs I have are slightly different. One has a little less focus shift at 3m and the other is slightly better at infinity. The 5-6 100-500s I've used have been remarkably consistent for a zoom.

EBH

Apr 20, 2026 at 09:31 PM

Steve Spencer
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p.1 #20 · General observations of 90D, R100, R10.

EB-1 wrote:
The 100-400 II and 100-500 weigh within 10-20 grams of each other in shooting configuration.
Of course the 100-500 is a bit better and has a very useful extra 100mm, but the 100-400 II is quite good with the 50MP 5Ds/R for which it was designed. The two 100-400 IIs I have are slightly different. One has a little less focus shift at 3m and the other is slightly better at infinity. The 5-6 100-500s I've used have been remarkably consistent for a zoom.

EBH

The in use weight, especially on a RF mount camera aren't that close. Thedigitalpicture.com puts the 100-500L in use weight at 1,610g for the in use weight and the EF 100-400L II at 1700g, plus on an RF camera you would have to add the weight of the adapter as well making the difference over 200g. The EF 100-400L II is a really nice lens, but Canon made the RF 100-500L both a little longer and a bit lighter.

Apr 20, 2026 at 10:41 PM

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