I talk about cameras to anyone who will listen. How to shoot. What to shoot. Where to shoot. I do as much listening as talking. There’s a lot of good info to be gleaned.
Last week one one of the guys I talk cameras with in the studio, Bill Koczocik, brought in a lens for me to try. It’s a Sigma 24-70mm f/2.8. That means it’s a fast midrange zoom.
The word “fast” when referring to lenses means less light is needed and the depth-of-field (distance range from the lens which is in focus) can be very shallow. Fast lenses are usually sharper and heavier too. Guilty on both counts.
I threw the lens on the camera this afternoon and walked toward the brook. Though this little river flows year-round this is its low point–especially after a week without rain. The smaller the brook or stream the more it reacts to instantaneous weather with extremely variable flow rates.
With little near the stream bed but exposed rocks I concentrated on the last of the perennials still in bloom (and then only barely).
Here’s what I found. As I expected this lens is in a strange, not wide enough/not long enough, zone for my camera.
Bill, whose Canon has a full size sensor, sees totally different images from this very same lens. On his camera the field-of-view is much wider.
At f/2.8 the lens doesn’t need a lot of light, however the focus at that aperture was much more critical than I expected. I have little experience with this grade of lens.