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12-31-2013, 02:00 AM   #1
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m43 and cropfactor question

hi sorry, so juts to clear things up.. say for a camera with 2x crop factor...
a 50mm regular lens ADAPTED to that mirrorless camera will act liike a 100mm?
what if NO ADAPTING is required. so a mirrorless camera with an m43 lens? 50mm is 50mm?

if that makes sense..
thanks :P!

12-31-2013, 02:24 AM   #2
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50mm is 50mm on any camera as it's a lens property; it's all about the field of view.

So if you mount an ancient 50mm on a m43 or if you mount a brandnew hot from the factory 50mm, the field of view is the same.
12-31-2013, 02:56 AM   #3
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QuoteOriginally posted by nivek535 Quote
hi sorry, so juts to clear things up.. say for a camera with 2x crop factor...
a 50mm regular lens ADAPTED to that mirrorless camera will act liike a 100mm?
what if NO ADAPTING is required. so a mirrorless camera with an m43 lens? 50mm is 50mm?

if that makes sense..
thanks :P!

A 'standard' lens in full frame terms is 50 mm.
You will get the same field of view for apsc with +-35mm
And you will get the same field of view for m43 with a 25mm


Thus for m43 you could consider 25mm the standard focal. A 50mm will always behave as a small telelens on m43
Regardless of an adapter or not.
Hope it helps
12-31-2013, 04:49 AM   #4
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HI GRISPIE ITS YOU AGAIN !
so the mount/whatever the lens was built for actually doesn't affect much...?
then what's crop factor...
oh my i am sooooo confused now...
can't wait to experiment hands on when my adapter arrives... maybe ill understand then ?

12-31-2013, 05:23 AM   #5
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QuoteOriginally posted by nivek535 Quote
can't wait to experiment hands on when my adapter arrives
so you bought a cam then? -

Yes, you'll understand once you can put your lenses on something.
I don't know how to explain it better..
12-31-2013, 05:23 AM   #6
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If you are always using the same camera system, you do not need to care about crop factor. If you have an MFT system, simply buy the 14mm, 20mm, and 45mm prime lenses and you can cover almost all situations for a minimal outlay of money. You can't go wrong with these lenses. Then just enjoy shooting!

If, like many of us, you use multiple systems with different sensor sizes, and you switch lenses between them, then it helps to get the concept of equivalency straight. That is why I wrote Equivalence of Camera Systems.
12-31-2013, 05:35 AM   #7
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QuoteOriginally posted by nivek535 Quote
so the mount/whatever the lens was built for actually doesn't affect much...?
then what's crop factor...
Focal length is a property of the lens.
Crop factor is a property of the body, it's a way of designating the size of the sensor.
The focal length and sensor size together define the field of view.
12-31-2013, 06:27 AM   #8
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Hi,

This is a very common question and a source of confusion. I have written several articles on the topic but they are in spanish. In summary, focal lenght is a physical property of the lens. It is what it is regardless of digital or film, movie or still, new or old. What changes is how much of the image is recorded.

This drawing gives you an example:



(just for translation: LUZ = light, largo focal = focal lenght and lente=lens My name is the same in all languages )

This lens is of a given focal lenght. As you can see, the image is creates is the same. What changes is how much of it is recorded.

When digital came into the scene, marketing used the "equivalences" referencing to film. Since an APS-C sensor records a smaller portion of the image, it has a similar field of view as if it were taken with a longer lens in a film camera. That's where these factors came from.
The perspective doesn't change. Just how much is recorded.
Usual APS-C is a 1.5x crop factor. Canon APS-C is 1.6x and micro 4/3 is 2x. Similarly, a bigger sensor like medium format would be less than 1X depending on the size. It is all just referenced to the standard 35mm because it was (and still is) the standard of the world.

Hope this helps.

Thanks,

01-01-2014, 02:36 PM   #9
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i think i kinda have an idea now ! so an m43 50mm and a pentax 50mm adapted, will both look identical. however when compared to a fullframe with the 50mm lens, the mirrorrless will have it cropped by 2x?
!
01-01-2014, 11:25 PM   #10
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You've got it
01-02-2014, 01:45 AM   #11
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QuoteOriginally posted by rparmar Quote
If, like many of us, you use multiple systems with different sensor sizes, and you switch lenses between them, then it helps to get the concept of equivalency straight. That is why I wrote Equivalence of Camera Systems.
good article.
I was not aware of the ISO impact.
So if I understand well: the ratio of iso is equivalent to the sensor ratios (at least approximately).
Is this the only reason why FF is more light sensitive than apsc e.g.?

Second: I recently asked someone why FF seems to have more depth of field than apsc. If I understand you right, it doesn't have more depth of field than another sensor size.
So I assume it just seems that way, because if i want to create the same fov as with an apsc sensor (with a standard lens) I will likely use a telelens on a FF? Or I will move my FF camera forward (thus closer to my subject creating more bokeh effect)
Did i get this right?
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