Serious question about Canon Mount Adapter EF-EOS-M

I purchased a M3 (for a carry around) which I absolutely love along with the 18-55 Lens. I also have the Adapter EF-EOS-M. Now here's my question. When using this.... (lets say with a 40mm pancake)... because the lens is further away from the sensor, does this change the actual magnification. I own 1D's and a couple of crop bodies... and we all know what happens with a 300mm on a 7D MK ii (with the 1/6 sensor compared to a 5D MK II)...... BUT does using the adapter (which has no magnification) actually change the "aspect" of the millimeters??

I'm having a hard time finding a "proven" answer.

Thanks in advance....

IDK about a 'proof', but I have an M6 + adapter and the answer is it acts just the same as if you had the lens on a crop sensor. The adapter moves the EF/EF-S lens to the same distance it would be on an EF/EF-S lens camera.

So it should look exactly the same on the M3 as it does on your 7D.

same, same, or very similar...
Given the M3 and the 7D share the same sensor size (22.3mm x 14.9mm), the EF-EOS-M adapter just places EF & EF-S lenses the correct distance away from the sensor.
If you had a EF-M lens at 18mm, you'd see the same image output as when using the mount adapter & an EF or EF-S 18mm lens.
Don't know if you have to move the camera forwards the thickness of the adapter to see exactly the same view however.

jetzwing wrote in post #18438581
does using the adapter (which has no magnification) actually change the "aspect" of the millimeters??

No.

joeseph wrote in post #18438803
same, same, or very similar...
Given the M3 and the 7D share the same sensor size (22.3mm x 14.9mm), the EF-EOS-M adapter just places EF & EF-S lenses the correct distance away from the sensor.
If you had a EF-M lens at 18mm, you'd see the same image output as when using the mount adapter & an EF or EF-S 18mm lens.
Don't know if you have to move the camera forwards the thickness of the adapter to see exactly the same view however.

The focus distance is always measured to the sensor plane, so no you wouldn't have to move the system forwards by the width of the mount.

Alan

jetzwing wrote in post #18438581
I purchased a M3 (for a carry around) which I absolutely love along with the 18-55 Lens. I also have the Adapter EF-EOS-M. Now here's my question. When using this.... (lets say with a 40mm pancake)... because the lens is further away from the sensor, does this change the actual magnification. I own 1D's and a couple of crop bodies... and we all know what happens with a 300mm on a 7D MK ii (with the 1/6 sensor compared to a 5D MK II)...... BUT does using the adapter (which has no magnification) actually change the "aspect" of the millimeters??

I'm having a hard time finding a "proven" answer.

Thanks in advance....

Glad you asked that question so I could read this thread's replies.

I had a further question whether the mount may affect stops of light, but I'm assuming that's a zero too since there are no optics like an extender.

Seriously considering a M5 in the near future.

It does not change effective focal length.

It does not change exposure values.

It merely adds the appropriately distance from the focal plane to where an EF & EF-S lens are designed to achieve focus. There is less distance between the sensor (without the adapter) and EF-M designed lenses because they didn't have to account for the mirror box.

Very best,

mdvaden wrote in post #18473409
Seriously considering a M5 in the near future.

You might want to check CPW. I got a M6 with 18-150 with a Canon adapter thrown in and the EVF for an extra $50 - this was earlier this year though. I know the M5 has the EVF, but you may get the adapter thrown in if you want the kit. I looked at cheaper 3rd party alternative adapters, but reading the reviews, I was worried they would not be a snug fit. $200 for the adapter really is a Canon rip-off job - it's just an extension tube with different mounts on each end.

ejenner wrote in post #18473640
You might want to check CPW. I got a M6 with 18-150 with a Canon adapter thrown in and the EVF for an extra $50 - this was earlier this year though. I know the M5 has the EVF, but you may get the adapter thrown in if you want the kit. I looked at cheaper 3rd party alternative adapters, but reading the reviews, I was worried they would not be a snug fit. $200 for the adapter really is a Canon rip-off job - it's just an extension tube with different mounts on each end.

Reviews of 3rd party had me questioning too. Sounds like most worked, but wiggling would nag at my mind.

I'd probaby go for the M5 for the EVF, plus I've had 100% good going refurbished from Canon on two DSLRs and one 70-200mm. So I'm looking at a refurbished M5 with a Free Canon refurbiished adapter for $749 total.

I keep forgetting about refurbished., and then every time I do remember, they don't have want I want. That sounds like a good deal.

I've ended up using my M6 mostly with my 400 DO II + 2xTC as far as EF lenses go (which I wasn't anticipating), so having that adapter rock-solid had been a necessity really, and of course the Canon adapter is rock-solid.

ejenner wrote in post #18475081
I keep forgetting about refurbished., and then every time I do remember, they don't have want I want. That sounds like a good deal.

I've ended up using my M6 mostly with my 400 DO II + 2xTC as far as EF lenses go (which I wasn't anticipating), so having that adapter rock-solid had been a necessity really, and of course the Canon adapter is rock-solid.

Are you having challenges with your nose tapping the screen or accidental touching where not wanted?

I'm considiering the M5 also as an intro to learn mirrorless, touch screen and adapters. Sort of experimental. I know with an adapter, it's only maybe a few ounces lighter than an 80D ...

mdvaden wrote in post #18475098
Are you having challenges with your nose tapping the screen or accidental touching where not wanted?

I'm considiering the M5 also as an intro to learn mirrorless, touch screen and adapters. Sort of experimental. I know with an adapter, it's only maybe a few ounces lighter than an 80D ...

I am not having that issue, but I'm not sure what is enabled while I am looking through the EVF. For instance with the M5 you can change the focus point while you are shooting, but you can't do that with the M6, so I think the attachable EVF switches off the touchscreen. For birding using the 400+TC @ f8 I would love to be able to move the focus point around while looking though the EVF, and occasionally regretted not getting the M5, but I never though about the potential issue of my nose tapping the screen.

The way I foresaw me using the camera is as something to have when I am out with he 7DII + 400 DO for landscapes and other shots. I used to carry the sigma 18-250, but it is not a great lens. I also wanted something for backpacking and hiking and that's why I went M6 over M5. The 11-22 is a seriously good lens for landscapes and my copy of the 18-150 is nice and sharp. Both lenses are small and light (but obviously not fast). But really I can get nearly as good shots as with the 5DIII + 16-35 f4 in most situations.

As far as mirrorless, I think this is the first Canon mirrorless with a decent AF and fps which makes it not that far from a DSLR. The touch screen is nice, but you need to remember to use it, then it is quick. The EVF is sill a good reason to own a DSLR (IMO), but is definitely nice to have over just the screen for some applications - video and holding the camera still (or accurately positioning the AF point) are what I use it for.

So I think it is good if you have a reason to use it by itself, and then when it makes sense you can use the adapter. For instance, on vacation I took the EF-M lenses + my 50 1.4 for something fast. If it is just a camera you are always going to use with EF lenses, I'm not sure - especially if you have an 80D, which is a very similar sensor I think.

mdvaden wrote in post #18475098
Are you having challenges with your nose tapping the screen or accidental touching where not wanted?

I did have that exact problem with the M5 when I first got it...
For some reason Canon thought a default setting of having the touchscreen active (even when the display turned off while you were using the EVF) was a good idea.
Caused all sorts of mis-focussing, poor shots & lots of swearing! Eventually read enough of the manual to work out you can disable either all or parts of the touchscreen to prevent issues, and leave a part active so you can move the focus point whilst still holding the camera to your eye.

joeseph wrote in post #18475155
I did have that exact problem with the M5 when I first got it...
For some reason Canon thought a default setting of having the touchscreen active (even when the display turned off while you were using the EVF) was a good idea.
Caused all sorts of mis-focussing, poor shots & lots of swearing! Eventually read enough of the manual to work out you can disable either all or parts of the touchscreen to prevent issues, and leave a part active so you can move the focus point whilst still holding the camera to your eye.

ejenner wrote in post #18475110
I am not having that issue, but I'm not sure what is enabled while I am looking through the EVF. For instance with the M5 you can change the focus point while you are shooting, but you can't do that with the M6, so I think the attachable EVF switches off the touchscreen. For birding using the 400+TC @ f8 I would love to be able to move the focus point around while looking though the EVF, and occasionally regretted not getting the M5, but I never though about the potential issue of my nose tapping the screen.

Have either of you used the M5 / M6 with a Rokinon M mount Fisheye lens? I noticed one is available.

Also, it would great of the M5 was useful "stand alone" ... but part of my thought is a 3rd body as a 2nd backup, that's small enough to fit the remaining slots in my two bags. An 80D is not much bigger, but there is a noticeable difference.

I have pondered a Fisheye again, hence the Fisheye question. It looks half the size of Rokinon's lens for Full Frame.

The more I research this, the more it seems there's more good compact lens choices than meets the eye for Canon M5 or M6. There's the few native lenses. But then there's the Rokinon fisheye. And then there's several Canon prime like the pancake 40mm, nifty fifty, etc. that take up miminal space. I could see someone putting together a very nice small kit with these Canon mirrorless.

The video below by a Christopher Frost, was done with the Canon M3 .. he adds that his lens copy seemed sharper than the counterpart for digital SLR cameras.

I think IQ is definitely there as a backup camera, definitely. I think it is a bit better than the 7DII.

I have not looked at 3rd party M mount, FE is kind of a specialty, but is something I do use for landscapes, so I should consider that as part of my backpacking kit. I did think about the pancakes, but need to see if fast primes will be useful for my uses. I don't think I will get the EF-M 22/f2, I usually use longer FL for portraits.