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Seeking advice: New lens: Nikon 105 f2 DC or Fuji 90 f2

Started Feb 22, 2018 | Questions thread
MisterHairy Senior Member • Posts: 2,561
Re: Seeking advice: New lens: Nikon 105 f2 DC or Fuji 90 f2

SpacemanUA wrote:

MisterHairy wrote:

What bad math, pray tell? My comments about aperture size are correct and if you read what I have written, I have said that a lens' "speed" is a characteristic of the lens and is not dependent upon the camera, sensor or film. An f/2 lens is even an f/2 lens if it not connected to a camera.

And what's the point of your speech then? Just to get us know that 135/2 has bigger entrance pupil diameter? Breaking news!

A 135/2 lens does have a larger maximum aperture than a 90/2 lens; it is more than twice as large in terms of area.

Who cares? A lens is supposed to cover APS-C sensor in our case, so even if it would've been 500m in diameter, in won't change anything. It will transmit same 1/2 portion of light through it and will have same "speed" as 90/2, cause 90/2 is just big enough for APS-C sensor. Who the hell measure this "aperture area" if aperture is a relative value in camera lenses.

You may benefit from some background reading on the topic. Don't feel bad; lots of people don't know what all of those funny numbers on lenses mean, but if you are going to spread information on the internet then it might be helpful if it weren't misinformation. You are doing others a disservice with your bunkum.

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Really beautiful photograph!

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