My first question of the year! :bsmilie:
When seeing through the viewfinder, it is always at the largest aperture setting permitted by the lens. So assuming I'm using 10-20 f4-5.6, I realise at 10mm F4, the view is equally bright as 20 F5.6. And the metering gives identical exposure settings.
So what does this mean?
I understand that the aperture circumference is focal length/f number. Am I right?
If I'm right, at 10 F4, aperture circumference is 2.5mm. While at 20 F5.6, aperture circumference is 3.5714mm. Given that it is bigger, why the viewfinder didn't go brighter, and the metering didnt give a faster shutter speed?
I heard, that it could be due to more light being lost within the lens barrel as I go from 10mm to 20mm, hence the viewfinder didnt appear brighter. Is this true?
Thanks in advance for clarifying my doubts!
When seeing through the viewfinder, it is always at the largest aperture setting permitted by the lens. So assuming I'm using 10-20 f4-5.6, I realise at 10mm F4, the view is equally bright as 20 F5.6. And the metering gives identical exposure settings.
So what does this mean?
I understand that the aperture circumference is focal length/f number. Am I right?
If I'm right, at 10 F4, aperture circumference is 2.5mm. While at 20 F5.6, aperture circumference is 3.5714mm. Given that it is bigger, why the viewfinder didn't go brighter, and the metering didnt give a faster shutter speed?
I heard, that it could be due to more light being lost within the lens barrel as I go from 10mm to 20mm, hence the viewfinder didnt appear brighter. Is this true?
Thanks in advance for clarifying my doubts!