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Stupid question re: EOS-R
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Feb 15, 2019 08:34:11   #
rydabyk Loc: Florida Panhandle
 
This may be a stupid question and/or my brain may not be working this morning but...since the EOS-R will recognize a EF-S lens such as the Canon 10-18, would it still shoot to 10-18mm or would it be 16-28.8mm?

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Feb 15, 2019 08:38:19   #
jerryc41 Loc: Catskill Mts of NY
 
Without knowing the camera or the lens, I will give you an answer. The lens will always be 10-18mm. Those numbers are derived from a formula. How the camera deals with what hits the sensor is something else. If both are FF, then the image will be somewhere between 10-18mm. Otherwise, the Canon crop factor (1.6?)will apply.

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Feb 15, 2019 08:47:07   #
rydabyk Loc: Florida Panhandle
 
jerryc41 wrote:
Without knowing the camera or the lens, I will give you an answer. The lens will always be 10-18mm. Those numbers are derived from a formula. How the camera deals with what hits the sensor is something else. If both are FF, then the image will be somewhere between 10-18mm. Otherwise, the Canon crop factor (1.6?)will apply.


Thanks for the reply Jerry, the camera is Canon's new mirrorless full frame camera but recognizes and accepts both EF and EF-S (made for crop sensor) lenses. I'm just not sure if it would automatically crop the 10-18 or not. I think I gotta be missing something.

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Feb 15, 2019 09:07:46   #
Dave327 Loc: Duluth, GA. USA
 
From the Canon USA web site: When using the proper EFS adapter the camera automatically crops the sensor to APS-C.

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Feb 15, 2019 09:36:12   #
rydabyk Loc: Florida Panhandle
 
Dave327 wrote:
From the Canon USA web site: When using the proper EFS adapter the camera automatically crops the sensor to APS-C.


Thanks Dave, why couldn't I find that

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Feb 15, 2019 09:44:39   #
User ID
 
Dave327 wrote:

From the Canon USA web site: When using the proper
EFS adapter the camera automatically crops the sensor
to APS-C.


Thaz pretty much an industry-wide norm, as is the
option to disable that. So why disable ? Cuz there's
many crop sensor lenses that have more coverage
than is needed for the crop format and some users
will want to use more of the available image circle,
to squeeze out a wider view where possible.

Example images are attached below to clarify this.

Of the three pix below all taken with a lens intended
only for APSC, the 1st is the normal APSC FoV. The
2nd, and wider, view is accomplished by mounting
the same lens on a FF body and cropping away only
the vignetted corners. The 3rd view shows the whole
FF result, complete with vignetted corners [orange
accent added in PP]. One could crop that 3rd view in
other ways as well, square or full left-to-right-edge
as a narrow panorama strip. Various APSC lenses will
have different amounts of excess coverage available.
Some will have none. And yes, there is some IQ loss
toward the edges of the extra coverage. How much
is too much depends on the subject or scene.







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Feb 15, 2019 10:38:01   #
Joe Blow
 
Using an EF-S lens will give you a cropped image. Thus, an 10-16mm lens would show ~16-28mm result.

EF-S lenses are cheaper because they are smaller and made for the consumer market (cropped cameras). The glass is smaller, most importantly, on the rear, to match the smaller sensor size of Canon's cropped line-up. When an EF-S lens is used on a full frame camera, it will give a heavy vignetted image. However, because of the distortion around the edges, you would need to edit crop even more of the image for a satisfactory photo.

The focal length of DSLR lenses is standardized for projecting an image of 36 x 24 mm. When a smaller sensor is used, the same formula is applied even if it doesn't use all the projection. That is why sometimes you will see even a bridge camera's zoom referred to in the equivalent full frame 35mm (36 x 24mm) nomenclature. This formula standardizes the focal lens descriptions so everyone knows what they have.

To clarify one aspect of the difference between cropped and full frame. An EF-S does not magnify the image. A 100mm EF-S lens will still project the same size image that an EF 100mm lens would. It is the sensor size that actually magnifies the image. It does that by trimming the edges so there is less picture to see. If you were to take a FF image and cropped off 15% of each side, you would have the equivalent of a cropped camera. Your crop did not magnify the image but it narrowed the view so it appears magnified.

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Feb 15, 2019 12:23:13   #
rydabyk Loc: Florida Panhandle
 
Thank you!

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Feb 15, 2019 13:36:27   #
Photocraig
 
rydabyk wrote:
Thanks Dave, why couldn't I find that


That's the answer I got from Canon support asking about the APS-C compatibility. Reasonably, the choice would be to go into the APS-C mode or have a vignetted image on the FF sensor. When I saw teh APS-C compatibility I got excited, but my too good to be true alarm went off.

For me, This means I can use all my lenses to start. (Can't even MOUNT an aps-C lens of a 5 series.) I have access to the RF lens technology (when Santa claus and John Bearsford Tipton come by simultaneously) and I can use my 4 native EF lenses on a 26MP Full Frame body for $1300. I'm still intrigued.

But it really means that to get full use of the RP, I think I'll have to go to the $2400? kit with the RF 24-105 IS. It is still less than the previous FF hurdle with a normal Zoom.

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Feb 15, 2019 16:17:31   #
User ID
 
Photocraig wrote:

But it really means that to get full use of the RP,
I think I'll have to go to the $2400? kit with the
RF 24-105 IS. It is still less than the previous FF
hurdle with a normal Zoom.


Which brings up the question of whether FF
is really relevant today for enthusiast level
photography ... which can be more exacting
than money makers like weddings and such,
I do acknowledge that. More exacting does
NOT mean more more demanding. If APSC
does about 90% of what you tackle, you can
just ignore the other 10%. But with money
maker jobs, you gotta do the whole 100%.

I have absolutely NEVER shot a single frame
for myself at 500/5.6 ... and damnt few on
the job, but I did bag those few as required.
Meanwhile, forums are full of discussion of
which fast 500 or 600mm lens is "best". I'd
use it ONLY at work.

Boring work it was, too: Speakers at very
distant podiums, Amtrack crossing a trestle,
workers repairing over-water bridges shot
from the river bank. Sure, I did a fine job of
all that. I'm proud enuf of it. But the results
do not fascinate me. I'd have never wanted
to bag such shots for any personal reason. I
don't even retain copies of any, no regrets.

I keep that 500 around just as a memento.
It's just part of the no-fun aspect of making
sure I didn't neglect that outlying 10%. And
no you don't wanna buy it. It's low tech :-)

Acoarst the enthusiast doesn't like to forego
the challenge of that 10%, but if the cost is
unreasonable it's better to take a pass. Also,
the FF outfit that can handle the whole 100%
on-the-job can hinder your on-NO-job stuff.
I will tote, use, and pay for stuff for using on
the job that is stuff I'd be loathe to tote and
use for my personal "serious" photography.

IOW, despite some overlap, I have different
gear for work and play, even serious "play".
So maybe you really need a Fuji or a Lumix.
Know what the BEST thing is about toting a
Lumix ? Easy to tote, yes, but that is not the
BEST thing. Best thing is that "the masses"
see you as a crazy camera toting throwback
with your "very serious" gear, but any photo
geeks or snots you encounter will just sneer
at your "toy" kit. Best of both worlds to me !

YMMV. Time will tell.


.

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Feb 16, 2019 06:35:05   #
miked46 Loc: Winter Springs, Florida
 
The new EOS RP, has a switch that will turn the EF-S lens to use a 1.6 crop. I imagine the EOS R does the same

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Feb 16, 2019 06:57:20   #
Dave327 Loc: Duluth, GA. USA
 
miked46 wrote:
The new EOS RP, has a switch that will turn the EF-S lens to use a 1.6 crop. I imagine the EOS R does the same

From the Canon web site: When using EF-S lenses, the EOS RP even automatically crops the sensor to reflect the EF-S lens size they are built for.
You make it sound like the user has to flip some switch or push a menu item.

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Feb 16, 2019 14:04:47   #
PHRubin Loc: Nashville TN USA
 
Dave327 wrote:
From the Canon USA web site: When using the proper EFS adapter the camera automatically crops the sensor to APS-C.


Keep in mind, the resulting image will have a cropped number of pixels, i.e. it won't have the full 30.3 MP. It will probably be ~12 MP (30.3/1.6²).

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Feb 16, 2019 14:13:47   #
Chris T Loc: from England across the pond to New England
 
Photocraig wrote:
That's the answer I got from Canon support asking about the APS-C compatibility. Reasonably, the choice would be to go into the APS-C mode or have a vignetted image on the FF sensor. When I saw teh APS-C compatibility I got excited, but my too good to be true alarm went off.

For me, This means I can use all my lenses to start. (Can't even MOUNT an aps-C lens of a 5 series.) I have access to the RF lens technology (when Santa claus and John Bearsford Tipton come by simultaneously) and I can use my 4 native EF lenses on a 26MP Full Frame body for $1300. I'm still intrigued.

But it really means that to get full use of the RP, I think I'll have to go to the $2400? kit with the RF 24-105 IS. It is still less than the previous FF hurdle with a normal Zoom.
That's the answer I got from Canon support asking ... (show quote)


Craig … sorry to burst your bubble - but THIS post is about the EOS R - which employs the same 30MP sensor as the 5D4, and costs - approximately the same, too ($3500) … whilst the RP is just about a third of that. And, yes, you can't mount CANON EOS APS-C glass on a 5D4, but you CAN mount 3rd party APS-C EOS glass on a 5D4. The beauty of both the EOS R MILC and the smaller EOS RP - is that they both will allow the use of ALL EOS mount glass, and will crop the image, accordingly. The Nikon D850, the Sony a99 II, and the Pentax K-1 / K-1 II - ALSO - include this provision. So, now, there are SIX FF cameras (at least) which do.

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Feb 16, 2019 18:49:11   #
John O.
 
Canon's new EOS R is full frame and your EFS lenses are designed for smaller APSC sensors. Your EFS lenses will not full your full frame sensor.

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