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07/11/2011 04:20:39 PM · #1 |
| I recently got an Olympus PEN and then bought a converter to use my Canon-mount lenses - mainly my Lensbaby. Since the adapter adds focal length and has no optical component, how is it that I haven't lost my ability to focus at infinity like I do with an extension tube???? |
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07/11/2011 04:37:22 PM · #2 |
| Is the adapter really "adding focal length" or does the lens simply have a narrower field of view due to the smaller sensor? |
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07/11/2011 04:41:34 PM · #3 |
Originally posted by Spork99:
Is the adapter really "adding focal length" or does the lens simply have a narrower field of view due to the smaller sensor? |
I take your point, I misused the term - it adds physical length; my question remains though since it adds about as much length as a 12mm extension tube. Do you think the geometry of the small sensor in relation to the lens would mean that it is in tolerance in a way that a larger sensor would not be? I can see how that might be the case... |
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07/11/2011 04:46:59 PM · #4 |
| When you lose extension tubes you lose the ability to focus to infinity as well. |
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07/11/2011 04:48:33 PM · #5 |
Originally posted by DCNUTTER:
When you lose extension tubes you lose the ability to focus to infinity as well. |
Just my point - I don't lose infinity focus with the adaptor ring... |
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07/11/2011 04:49:58 PM · #6 |
Originally posted by paulbtlw:
Originally posted by DCNUTTER:
When you lose extension tubes you lose the ability to focus to infinity as well. |
Just my point - I don't lose infinity focus with the adaptor ring... |
Oh, I see. I read "haven't" as have...sorry. LOL. |
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07/11/2011 05:33:43 PM · #7 |
Originally posted by paulbtlw:
Originally posted by Spork99:
Is the adapter really "adding focal length" or does the lens simply have a narrower field of view due to the smaller sensor? |
I take your point, I misused the term - it adds physical length; my question remains though since it adds about as much length as a 12mm extension tube. Do you think the geometry of the small sensor in relation to the lens would mean that it is in tolerance in a way that a larger sensor would not be? I can see how that might be the case... |
The Canon lenses are designed with more distance between the lens and the focal plane due to the mirror box in SLR cameras. Mirrorless cameras and lenses are much smaller due to the fact that the lens elements can be closer to the focal plane. The adaptor for the Canon lens adds that spacing back so that the lens will have its full focus range.
Did you get the adaptor for EOS lenses or FD lenses? I'm wondering how you change the aperture of the EOS lens when mounted on the m4/3 body. I suspect you can't, so the lens must be used only at its widest aperture, right?
Message edited by author 2011-07-11 17:35:52. |
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07/11/2011 05:43:25 PM · #8 |
Aah... that makes perfect sense.
I got the EOS one, yes maximum aperture, though of course for the Lensbaby with the manual aperture rings, this is a non-issue.
I did read somewhere that if you stop it down on a Canon body and then transfer it, it will stay at that aperture. I remain dubious about that and haven't tried it. |
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07/11/2011 05:59:28 PM · #9 |
Originally posted by paulbtlw:
Aah... that makes perfect sense.
I got the EOS one, yes maximum aperture, though of course for the Lensbaby with the manual aperture rings, this is a non-issue.
I did read somewhere that if you stop it down on a Canon body and then transfer it, it will stay at that aperture. I remain dubious about that and haven't tried it. |
Yeah, I heard that, too. Not a very desireable workflow.
One of the attractions of the PEN is the ability to get some older classic lenses and use them with an adaptor. The EOS lenses are out, but I think I can pick up some older manual focus Nikon glass at pretty good prices. My favorite lens of all time was the Nikon 105mm 2.5. They never made an auto-focus version. Should be fun to experiement with. I read on the forums that some people are using Leica glass on their PENs, but even an old Summicron is expensive.
With the PENs you get the added benefit of image stabilization with ANY lens since Olympus went with in-body IS. |
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07/11/2011 06:16:49 PM · #10 |
Well, this forthcoming lens might not be a Summicron:
M.Zuiko Digital ED 12mm F2.0
But you can certainly see the inspiration. This might go on my wish list....
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07/11/2011 08:31:57 PM · #11 |
Originally posted by paulbtlw:
Well, this forthcoming lens might not be a Summicron:
M.Zuiko Digital ED 12mm F2.0
But you can certainly see the inspiration. This might go on my wish list.... |
The 45mm 1.8 looks pretty sweet, too.
I do have the 25mm 1.4 Leica (made by Panasonic) on order. Looking forward to getting my hands on it! |
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