Canon RP Lens Compatibility?
May 12, 2019 13:42:42 #
Does anyone know if the new RP camera, and its lens adapter, can be used with the Canon EFS 18 - 135 mm lens? Thanks for your input.
May 12, 2019 13:50:20 #
LPigott wrote:
Does anyone know if the new RP camera, and its lens adapter, can be used with the Canon EFS 18 - 135 mm lens? Thanks for your input.
Yes, All EF and EF-S lenses will work with the adapter.
May 12, 2019 14:01:18 #
Yes, however, when an EF-S lens is mounted on the camera, it will automatically switch to a lower resolution to prevent vignetting.
May 12, 2019 14:03:36 #
rmorrison1116 wrote:
Yes, All EF and EF-S lenses will work with the adapter.
However, I've read that third-party EF and EF-S lenses are not necessarily compatible with the adapter, though.
May 12, 2019 14:08:27 #
It will fit, but since it’s a crop lens and the RP is a FF body, it may vignette, especially at wide focal lengths. The flange distance of the RP is 20mm, much shorter than the 44mm of EOS cameras, BUT the adapter adds 23mm so we’re back to 43mm, almost the same flange distance as mounting the lens on an EOS FF camera (if the mount would permit it). If anyone has tried this lens with an R or RP body, I’d be interested to know if you experience vignetting.
May 12, 2019 14:12:05 #
May 12, 2019 14:18:10 #
The adapter behavior is the same as how current Nikon full-frame cameras behave when a Nikon-brand DX lens is mounted to an "FX" camera. The Canon body automatically crops the image to fit inside the smaller image circle of the EF-S lens, reducing from the EOS RP's 6240x4160 - 26MP full-frame resolution to 3888x2592 - 10MP when the EF-S lens is mounted. The Canon EF to RF Adapter ends the mount distinction of EF vs EF-S onto Canon EOS bodies, although certainly the cropped EOS bodies retain a pixel resolution advantage over the adapted use of EF-S lenses onto the EOS-R / RP bodies.
May 12, 2019 14:19:48 #
josquin1
Loc: Massachusetts
Just asking, why bother owning a full frame camera if one is going to use an EF-S lens? The RP will automatically assume the crop of the lens and go down to a 1.6 crop. It will work but it will take away the advantage of the Full Frame.
May 12, 2019 14:34:50 #
CHG_CANON wrote:
The adapter behavior is the same as how current Ni... (show quote)
Thanks - didn’t realize that the Canon R series had adopted Nikon’s strategy for dealing with crop lenses on FF bodies. Hardy ideal, but it will work.
May 12, 2019 15:50:25 #
josquin1 wrote:
Just asking, why bother owning a full frame camera if one is going to use an EF-S lens? The RP will automatically assume the crop of the lens and go down to a 1.6 crop. It will work but it will take away the advantage of the Full Frame.
I'd speculate, because he already has the EF-S 18-135 lens!?
May 12, 2019 18:30:37 #
TriX wrote:
It will fit, but since it’s a crop lens and the RP is a FF body, it may vignette, especially at wide focal lengths. The flange distance of the RP is 20mm, much shorter than the 44mm of EOS cameras, BUT the adapter adds 23mm so we’re back to 43mm, almost the same flange distance as mounting the lens on an EOS FF camera (if the mount would permit it). If anyone has tried this lens with an R or RP body, I’d be interested to know if you experience vignetting.
The adapters add 24mm, not 23. In order for an EF mount lens to work properly on an RF mount the flange to focal plane distance has to be exactly the same.
May 12, 2019 18:37:44 #
DWU2 wrote:
However, I've read that third-party EF and EF-S lenses are not necessarily compatible with the adapter, though.
Did what you read give a reason? The EF mount on the adapter is identical to the EF mounts on all EOS DSLR's, and the contacts are also the same. I could see where some third party lenses may not yet communicate properly with the R or RP but attaching the lens to the adapter is exactly the same as attaching it to an EOS DSLR.
Now that I think about it I believe I did read something about some lenses not communicating properly with the cameras but that is the only issue I can think of regarding using any 3rd party lenses on the R or RP.
May 12, 2019 19:31:35 #
LFingar wrote:
The adapters add 24mm, not 23. In order for an EF mount lens to work properly on an RF mount the flange to focal plane distance has to be exactly the same.
Makes sense. just repeating the published thickness dimension of .9”. I see that B&H lists it both ways - .9” and 24 mm - guess they were just rounding it to the nearest 0.1 inch. Actually, even if it wasn’t exact, wouldn’t it just change the focusing distances slightly? You could still focus the lens, but the scale and infinity focus might be off just a bit.
May 12, 2019 20:57:18 #
TriX wrote:
Makes sense. just repeating the published thickness dimension of .9”. I see that B&H lists it both ways - .9” and 24 mm - guess they were just rounding it to the nearest 0.1 inch. Actually, even if it wasn’t exact, wouldn’t it just change the focusing distances slightly? You could still focus the lens, but the scale and infinity focus might be off just a bit.
They were probably trying to save a little ink on their web page!
It's actually .94". I'm pretty certain you can count on Canon to be precise in their manufacturing.
I think the bigger question would be: What person with any sense would buy an adapter (or anything else, for that matter) that wasn't made to the proper spec? Would you want an oil filter that almost fits your engine properly?
May 12, 2019 21:04:02 #
LFingar wrote:
...What person with any sense would buy an adapter (or anything else, for that matter) that wasn't made to the proper spec? Would you want an oil filter that almost fits your engine properly?
No disagreement there - I was just thinking that we regularly change the flange distance with extension tubes for macro work. The lens will still focus, but the distance is altered dramatically.
Cheers.
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