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Nx 50-150 is it really F4.2

Started Apr 12, 2016 | Discussions thread
ttbek Veteran Member • Posts: 4,869
Re: Nx 50-150 is it really F4.2

Harleysoftail wrote:

Milondon15 wrote:

I have just bought the Samsung 50-150 for a great price but my excitement was slightly dampened after finding that F2.8 lens on APS-C is really equivalent to F4.2 full frame lens. Is this true?

This great article might help clarity things for you:

http://www.bobatkins.com/photography/tutorials/crop_sensor_cameras_and_lenses.html

If you read the paragraph under "Aperture" you will find the following answer "f2 is f2 is f2 and f8 is f8...period.

Hope this relieves your anxiety about your lens purchase because this is a GREAT lens.

Most of this article is very good.  I would quibble about the aperture bit though. He doesn't say anything wrong, but while the f/2.8 on APS-C and on FF have the same brightness, they have different noise levels (for final output images of the same size at the same viewing distance, which is the standard for comparison).  It's true that if your final output is proportionate to the sensor size then this doesn't matter though.   I guess I should also be careful if we are talking about the same framing or the same distance to the subject if we consider DOF.

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