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Author Topic: APS-C to FF adapter?  (Read 631 times)

PeterAit

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APS-C to FF adapter?
« on: June 15, 2019, 11:50:51 am »

A friend claims to have an adapter that lets her use Canon APS-C lenses on a Canon full-frame body and cover the entire sensor. And it's just a physical adapter, no glass. Is this even possible?
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Peter
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mcbroomf

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Re: APS-C to FF adapter?
« Reply #1 on: June 15, 2019, 12:00:52 pm »

Probably a teleconverter, a 1.4x would just about do it.  Would not fit all lenses though.
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Martin Kristiansen

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Re: APS-C to FF adapter?
« Reply #2 on: June 15, 2019, 12:12:40 pm »

Probably a teleconverter, a 1.4x would just about do it.  Would not fit all lenses though.

OP said itís an adapter and has no glass. A 1,4 convertor would have glass would it not?
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mcbroomf

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Re: APS-C to FF adapter?
« Reply #3 on: June 15, 2019, 12:39:27 pm »

It would of course.  The only other way is to add a macro tube which would expand the image circle but at the expense of losing infinity.  Also not an adapter by definition.
Best you take a look at it as I'm not sure you're getting the whole story (ie get the specific parts involved)
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Martin Kristiansen

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Re: APS-C to FF adapter?
« Reply #4 on: June 15, 2019, 12:44:41 pm »

Sounds odd to me. If itís really an apsc lens to start with a simple tube with connectors wouldnít suddenly allow it to cover FF and work normally.
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Slobodan Blagojevic

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Re: APS-C to FF adapter?
« Reply #5 on: June 15, 2019, 12:47:07 pm »

Pardon my ignorance, and our engineers and scientists would correct me if wrong, but that sounds like an extension tube, no glass, just like the ones we use for macro photography. You'd lose the ability to focus at infinity, but you'd probably get an enlarged image and cover the whole sensor, depending on the length of the extension tube.

DP

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Re: APS-C to FF adapter?
« Reply #6 on: June 15, 2019, 02:44:34 pm »

A friend claims to have an adapter that lets her use Canon APS-C lenses on a Canon full-frame body and cover the entire sensor. And it's just a physical adapter, no glass. Is this even possible?

she probably has Canon FF dSLM and hence EF/EF-S to R mount adapter... no glass indeed
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Dan Wells

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Re: APS-C to FF adapter?
« Reply #7 on: June 15, 2019, 03:31:15 pm »

Would an R mount adapter even mount an EF-S lens (which, unlike other APS-C lenses, uses a physically different mount from standard EF)? If so, why - the EF-S lens is unlikely to cover full frame. An EF-M mount adapter would, but that's APS-C to APS-C.
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DP

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Re: APS-C to FF adapter?
« Reply #8 on: June 15, 2019, 06:37:41 pm »

the EF-S lens is unlikely to cover full frame.
may be some do ? just like some FF lens do cover 44x33 MF sensor ?
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DP

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PeterAit

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Re: APS-C to FF adapter?
« Reply #10 on: June 16, 2019, 03:34:13 pm »

she probably has Canon FF dSLM and hence EF/EF-S to R mount adapter... no glass indeed

It is all Canon gear. But I still do not understand how it works!!
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Peter
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mcbroomf

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Re: APS-C to FF adapter?
« Reply #11 on: June 16, 2019, 04:09:09 pm »

Canon R FF body or a Canon DSLR?
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dgberg

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Re: APS-C to FF adapter?
« Reply #12 on: June 17, 2019, 02:51:50 pm »

I have the metabones speedbooster and it is all short of amazing.
Pickup a stop plus it is so close to ff, I think 1.07.
It does have glass though.

Dan Wells

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Re: APS-C to FF adapter?
« Reply #13 on: June 18, 2019, 11:54:23 am »

A speedbooster would go the other way, wouldn't it? I thought they reduced the coverage area and effective focal length (actually magnification), while brightening the effective aperture. It's an inverse teleconverter if I understand it correctly.

A conventional teleconverter would do what this adapter does - it increases magnification and coverage area. It, too, has glass.

The only plausible adapter I can think of that does this without glass mounts an EF-S lens (SLR, APS-C) on an EF-R camera (FF mirrorless). The only way it works without coverage problems is if the EF-S lens has extra coverage and actually covers full-frame.

 This seems unlikely - any camera that can mount an EF-S lens can mount an EF lens (the reverse isn't true - FF DSLRs physically won't mount EF-S lenses), so Canon would put an EF mount on any lens that covers FF. The one possibility is a zoom that covers FFat some focal lengths.
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