RF 100-500 and 2.0x quality?

Started 2 months ago | Questions thread
Abbott Schindler Veteran Member • Posts: 3,080
Re: RF 100-500 and 2.0x quality?

Abbott Schindler wrote:

Ephemeris wrote:

I have thanks. If I try to understand your description your thinking that becuase we have twice the area of light he thinks you loose light whereas I assumed he means due to none perfect transmission trough the TC. I understand what your saying however.

Yes, it’s because of transmission — everything in the optical path absorbs some light regardless of how well it’s coated, its material, etc. Basic physics.

Also, I forgot to mention what everyone should already know: Extenders reduce the effective aperture of the lens. 1.4X is a 1-stop reduction, 2X is 2 stops. It's been quite a while since I studied the reason for this. The important thing is that smaller aperture = less light transmission.

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