That is why the f/stops are set on the lens. There is no communication between the lens & camera. It is a fully manual dumb lens so you set your f/stop on the lens. I wanted a lens so wide because I like doing multi-image panoramas. I only used the Meeting House for this post because it was in my neighborhood and wanted to see how good the lens would work for me I also hate photographing in cities and like to shoot out in nature. I was a Commercial photographer for 50 years so I enjoy the challenge to find different ways to get the images I see in my mind. Plus it is fun to try different ways to get the images you see in your mind. So with this lens I only need half as many. Some are also multiple rows of multiple images. Some of my panos before this are with 10 to 100 images or more. I like photographing panoramas and with this lens I can shoot half as many to a get very wide panoramas. Once I shoot a series of images I have to de-fish the images before I load them into 1 Photoshop file for making the final panoramas. At f/16 or f/11 from very close to infinity is all in focus. So you have to set the camera to shoot without seeing the lens and use aperture priority only. If you use f/11 or f/16 almost everything is in focus without manually focusing if you set the lens to infinity & the Camera on Aperture Priority. The Artisan TT 11mm lens does not communicate with the R camera body so you have to set the camera to shoot without a lens and manually set the f/stop you want to use on the lens. You can also use the Warp tool to fine tune the image distortion a little more after using the Adaptive Wide Angle filter. Sometimes it takes a few tries especially with Fisheye lenses like this 11mm Fisheye lens. So I use Photoshop’s Adaptive Wide Angle filter under Filters and enter the info needed there to de-fish the images. If shooting Multi-image Panoramas with Fisheye lenses before blending the images you have to remove the “Fish-eye” distortion. This is also useful if shooting multi-image panoramas with Fish-Eye lenses for an even wider view because the Fisheye effect makes it almost impossible to blend the images nicely. But when working on the files it is easy to correct and remove the Fish-eye look. Fish-eye lenses give you a very wide Field of View but you have the Fish-eye Effect look or Warped looking images. Lately I am shooting landscapes with Fisheye Lenses for a very wide angle of view with 1 image or sometimes multiple image panoramas.
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