Size comparison of FE 4/2470 on A7 vs Olympus 12-40 f2.8 on GX7

Started Feb 6, 2014 | Discussions thread
Erik Magnuson Forum Pro • Posts: 12,247
Doesn't work like that

Krich13 wrote:

Well, these x0.2 and x0.3 magnification factors are those of the lenses themselves. Sensor size makes a big difference though: Olympus magnification is like x0.6 in FF terms.

Doesn't work like that unless you are also using a 16MP FF sensor.

A 2-cm tall bug would fill the frame (height wise) of an m43 camera when used with Oly 12-40 lens,

I think you need to re-check your math:  a 20mm bug * 0.3x would be only 6mm long on the sensor and so not cover even 1/2 of the height of an MFT camera.  It would cover ~1600 pixels.

but only occupy 1/6 of a frame height if imaged by Sony A7(R) and Zeiss 24-70.

20mm * 0.2 is 4mm on the sensor.  You at least got this number right.

Even the pixel count of A7R can't compensate the difference in magnification.

No, but it's a lot closer than you make out.  To get the bug to cover 1600 pixels on the A7R, you only need a 0.4x magnification lens. Do the math.

-- hide signature --


Post (hide subjects) Posted by
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow