Skip to content

Day 233

I was out fooling around with my Sigma 600mm f8 Mirror lens today.  I think the camera body slightly surpasses the ability of the lens.  This is why there are “digitally optimized” lenses now.  The other limitation I have found is that it is a manual focus lens, and the Canon DSLR (Digital Single Lens Reflex) cameras are pretty much auto focus designed: no  good micro prism viewing screens to see the image on.  Old manual focus cameras had a split screen micro prism.  You could see the image around a circle, and it was in or out of focus, but the circle was a split screen, and you could line up the top and bottom of the circle…when the image in the circle aligned, it was in focus!  They don’t (or very rarely) have that for digital cameras.  It is all automatic focus, and while possible it is hard to focus manually for most images.  Not to mention on a digital crop body this lens is an effective 960mm, so holding it still is a bit tricky!

One duck.

(1/1000, f8, 600mm, ISO 400)

Two ducks.

(1/1000, f8, 600mm, ISO 400)

Three ducks.

(1/1000, f8, 600mm, ISO 400)

More ducks.  Tomorrow!

~Curtis in /\/\onTana! {!-{>

One Comment