loss of light from the redrock adaptor and lens

[Daniel Carruthers]

Hi

I searched this forum and to my understanding the redrock adaptor cuts out 2 stops of light. is that including the lens as well?

lets say I have a zoom lens 28-80mm with the minimum aperture of 2.8 does that mean I lose 4 stops of light. 2 from the adaptor and 2 from the lens?

[Michael LaVoie]

You lose 2 stops but you deduct that from however you're rating the camera. If you're shooting with the HVX for example and you normally rate it at a 400 and you read your key light and get a F5.6, you know that with the adaptor, you'll be setting your lens to 2.8 That's how I normally do it. That or change your meter to whatever ASA gives you that proper deduction.