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Olympus 7-14 F2.8 FF equivalent
  
 
Jo Dilbeck
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p.1 #1 · p.1 #1 · Olympus 7-14 F2.8 FF equivalent


So I'm trying the lens on my EM2, and I have a question. My understanding is that the FF equivalent of this lens would be 14-28, however when I take the same scene with this set up and compare to my Canon 17-40 at 17mm on my 5D3, the 17-40 is quite noticeably wider. It looks like the Oly @ 7mm is about equal to 20-21mm on the FF Canon. Does anyone have any thoughts on this?. Does this make sense?. I'm reluctant to give up my FF wide angle under these circumstances.

Thanks, Jo



Jun 21, 2017 at 05:49 PM
millsart
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p.1 #2 · p.1 #2 · Olympus 7-14 F2.8 FF equivalent


DSLR's are native 3:2 while your m4/3 is a 4:3 ratio sensor, thus different FOV on the horizontal axis


Jun 21, 2017 at 09:52 PM
Jo Dilbeck
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p.1 #3 · p.1 #3 · Olympus 7-14 F2.8 FF equivalent


Well, heck, I never thought of that. I believe I can change that setting in the Em-2, I'll have to check and see if that makes a difference. Thank you!


Jun 21, 2017 at 10:03 PM
bobbytan
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p.1 #4 · p.1 #4 · Olympus 7-14 F2.8 FF equivalent


See these posts/threads:

https://www.mu-43.com/threads/focal-length-of-lenses-different-aspects-1-1-4-3-3-2-16-9.88330/#post-958771

https://www.dpreview.com/forums/thread/3352810



Jun 21, 2017 at 10:25 PM
millsart
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p.1 #5 · p.1 #5 · Olympus 7-14 F2.8 FF equivalent


Jo Dilbeck wrote:
Well, heck, I never thought of that. I believe I can change that setting in the Em-2, I'll have to check and see if that makes a difference. Thank you!


You can, but your not changing the native pixel ratio, your just apply a crop, essentially chopping off the top and bottom of the 4:3 frame to make it 3:2



Jun 21, 2017 at 11:21 PM
drofnad
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p.1 #6 · p.1 #6 · Olympus 7-14 F2.8 FF equivalent


Jo Dilbeck wrote:
Well, heck, I never thought of that. I believe I can change that setting in the Em-2, I'll have to check and see if that makes a difference. Thank you!


No, you can change the camera's view of its 4:3 capture --i.e., get a 3:2 crop--, but not take a wider slice of the lens circle (as could be done in LX3/5/7/100, GH1/2(/3?) ...).

www.pointsinfocus.com/tools/depth-of-field-and-equivalent-lens-calculator/

Gives contradictory indications to your observation, claiming 102deg vs. 93deg resp. of 4/3(@7mm) & FF(@17mm), so if what you've seen is right --and IMO your saying it was quite noticeable seems quite wrong--, there must be a lot of the would-be width of the Pana lens being lost to image correction by software?!

-d.



Jun 21, 2017 at 11:45 PM
bobbytan
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p.1 #7 · p.1 #7 · Olympus 7-14 F2.8 FF equivalent


Yes ... so it's not a good idea to go with the 3:2 aspect ratio in-camera. Better to crop the image (if needed) in post.

millsart wrote:
You can, but your not changing the native pixel ratio, your just apply a crop, essentially chopping off the top and bottom of the 4:3 frame to make it 3:2





Jun 21, 2017 at 11:56 PM
AmbientMike
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p.1 #8 · p.1 #8 · Olympus 7-14 F2.8 FF equivalent


I think it depends on the camera. On my old one, I shoot at 3:2. But on some of the newer ones, I think it just crops from 4:3 to 3:2, so I'd probably rather shoot 4:3, and in theory, 3:2 shouldn't make your lens wider. But it might be worth a try.


Jun 22, 2017 at 03:47 AM
Jo Dilbeck
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p.1 #9 · p.1 #9 · Olympus 7-14 F2.8 FF equivalent


Actually, I've discovered what it was. Both cameras were set to 4.3 ratio and I still had the problem. Lightbulb went off and going through the menus showed that the digital teleconverter option was ON! Turned it off and poof, wide angle is wide angle again. I do not remember turning that on, perhaps when I had my 300 f2.8 on and was going for as much reach as possible. Thanks for the help everyone!. Now to decide between the Oly 7-14 and new Pany 8-18. I'm leaning toward the Pany for the ability to use filters, particularly ND filters.


Jun 22, 2017 at 04:18 PM
 

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bobbytan
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p.1 #10 · p.1 #10 · Olympus 7-14 F2.8 FF equivalent


I would go with the Pany too for the reason you mentioned. Also, the Pany is smaller and lighter than the Oly. I started with the Pany 7-14; then switched to the Oly 7-14; then switched back to the Pany 7-14 ... and I finally sold the Pany too as I have a Sony 16-35 for my A7RII for my landscape work.

Jo Dilbeck wrote:
Actually, I've discovered what it was. Both cameras were set to 4.3 ratio and I still had the problem. Lightbulb went off and going through the menus showed that the digital teleconverter option was ON! Turned it off and poof, wide angle is wide angle again. I do not remember turning that on, perhaps when I had my 300 f2.8 on and was going for as much reach as possible. Thanks for the help everyone!. Now to decide between the Oly 7-14 and new Pany 8-18. I'm leaning toward the Pany for the ability to use filters, particularly ND
...Show more



Jun 22, 2017 at 05:48 PM
JPTrunck
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p.1 #11 · p.1 #11 · Olympus 7-14 F2.8 FF equivalent



Jo

Also consider doing Panoramas. Your resulting image can be as wide as you wish.

Jim





Jun 23, 2017 at 07:09 PM
nandadevieast
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p.1 #12 · p.1 #12 · Olympus 7-14 F2.8 FF equivalent


I want to know:
24mm in M43 is what focal length on full frame?
35mm ?
50mm ?

Thanks



Jun 24, 2017 at 01:50 PM
bobbytan
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p.1 #13 · p.1 #13 · Olympus 7-14 F2.8 FF equivalent


The crop factor is 2x so 24mm = 48mm.

nandadevieast wrote:
I want to know:
24mm in M43 is what focal length on full frame?
35mm ?
50mm ?

Thanks




Jun 24, 2017 at 02:22 PM
nandadevieast
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p.1 #14 · p.1 #14 · Olympus 7-14 F2.8 FF equivalent


No
I meant different aspect ratios
Is 12mm 4:3 (m43)= 24mm 3:2 (FF)
If not then what focal length?

bobbytan wrote:
The crop factor is 2x so 24mm = 48mm.





Jun 24, 2017 at 03:26 PM
drofnad
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p.1 #15 · p.1 #15 · Olympus 7-14 F2.8 FF equivalent


nandadevieast wrote:
No
I meant different aspect ratios
Is 12mm 4:3 (m43)= 24mm 3:2 (FF)
If not then what focal length?


I believe that my prior post (above) is to the point you ask --i.e., of horizontal FoV (nevermind what is gained/lost vertically via aspect ratio; nevermind the diagonal equivalents). Somehow, this has been overlooked. (IMO, I find it surprising as does that FOV calculator above-cited if 17mm of FF > 7mm(14mm-eq) of m4/3 ! )

-d.




Jun 24, 2017 at 03:57 PM
whumber
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p.1 #16 · p.1 #16 · Olympus 7-14 F2.8 FF equivalent


nandadevieast wrote:
No
I meant different aspect ratios
Is 12mm 4:3 (m43)= 24mm 3:2 (FF)
If not then what focal length?



It gets a little sticky there because you have to decide what you're holding constant, the horizontal fov or the vertical fov. If you want the 3:2 aspect ratio and the same horizontal FOV then m43 actually has a 2.08x crop. On the other hand, if you want the 4:3 aspect ratio and the same vertical FOV then you have a 1.84x crop. Everything else is going to be somewhere in between.



Jun 25, 2017 at 04:20 AM
nandadevieast
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p.1 #17 · p.1 #17 · Olympus 7-14 F2.8 FF equivalent


Hi
Can someone answer this very basic query for me?

M43 lens focal lengths are calculated at native 4:3 aspect ratio. So 9-18 mm Olympus is 9mm at the wide end at 4:3 aspect ratio.

What will be 9-18 if the aspect ratio is 3:2 ?


Is there a formula, suppose I want to know the 3:2 focal lengths of other lenses...



Jul 02, 2017 at 04:14 PM







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