Neutral density filters

[rockydog]

Rocky, I think most of us understand the F-stop conventions. What I was originally referring to about 'Glass' is the tiny 20mm LENS on the DJI. It doesnt matter if you open a lens up to zero you just are not getting a lot of light through a 20mm lens. IE: most of us are familiar with handheld cameras with 40 or 50 mm lenses. A 40 mm lens will admit 4 times the light that the 20 will. Sorry if I was misunderstood. When talking about how much light is available, the F-stop is pretty much after the fact. There that is probably enough info to be dangerous.. Toodle pip.

Very dangerous!...The lens on the Phantom is not a 20mm lens, it's equivalent to a 20mm on 35mm format. It's actually about 3.5mm as the 1/2.3 sensor used in the Phantom has a crop factor of about 6 compared to 35mm. The focal length of a lens has nothing to do with its light gathering capability...that's purely a function of aperture. You must know from your experience as a photographer that if you're taking a shot of something, your exposure will be f8 at a 30th (for example) irrespective of whether you're using a 50mm lens or a 100mm lens. End of rant.

Apologies to mahseve for going off topic!

 

[Philltayl]

Very dangerous!...The lens on the Phantom is not a 20mm lens, it's equivalent to a 20mm on 35mm format. It's actually about 3.5mm as the 1/2.3 sensor used in the Phantom has a crop factor of about 6 compared to 35mm. The focal length of a lens has nothing to do with its light gathering capability...that's purely a function of aperture. You must know from your experience as a photographer that if you're taking a shot of something, your exposure will be f8 at a 30th (for example) irrespective of whether you're using a 50mm lens or a 100mm lens. End of rant.

Apologies to mahseve for going off topic!

The poster was not talking about focal length but the diameter of the 'glass' which in the case of the P3 is 'plastic'

Rant over........

 

[rockydog]

The poster was not talking about focal length but the diameter of the 'glass' which in the case of the P3 is 'plastic'

Rant over........

Don't think so...specially when he's comparing 20mm lens of the Phantom to a 40mm lens on a 35mm camera -( and the Phantom lens is quoted as 20mm equivalent in the specs).
Anyway, we can all agree to disagree

(Think about the tiny lenses on mobile phones...they seem to gather plenty of light)