I'm about to moon you all


So now I've got this huge 100-400mm lens for my camera, I thought I'd borrow Julie's 2x teleconverter and take another shot of the moon with this 800mm lens.

Since the lens is normally f/5.6 at 400mm, it will lose autofocus with any teleconverter when mounted on my Canon 350D. A 2x teleconverter loses two stops of light, making the 400mm f/5.6 lens into an 800mm f/11 (see this page for an explanation of f stops).

Such a long lens will magnify any vibration or movement of the camera - even trying to focus would move the lens enough to bump the moon out of sight. That, as well as the annoyingly small viewfinder of the 350D made focusing rather hard.

Also, the 35 year old tripod I have isn't the most stable - which made it hard to keep the camera pointed close enough to the moon.

Anyway, I'm happy with this as a first attempt at 800mm, I might try again tonight.

Click here for the full size image