Start Considerations about map updating and images resolution

Considerations about map updating and images resolution

And, further down this page you'll also find the key gear-related blog entries from 2015 (jump to that section now).

While I am not one who is fixated on endlessly fine-tuning the autofocus system on my cameras and lenses (I tend more towards a attitude towards AF tuning), I thought it would be prudent to check the focus tuning on the lenses I am evaluating and comparing in this "500mm Wars" series.

For consistency's sake, I used the EXACT same protocol in AF Tuning all the lenses in this test which, in this case, means I used the Nikon D5's and D500's "automated" AF tuning features and followed the 8 "fluid guidelines" I described in my 27 April 2016 blog entry entitled (jump to that entry with THIS LINK).

I'm thinking I'll quite like the Sigma 3 focus delimiter system (and the distances CAN be customized using the USB dock and Sigma Optimization Pro software - see immediately below).

• Customization Switch: This switch is found on the Sigma 500mm only (there's nothing comparable on the Nikon 500) and is used to switch between default lens settings or one of two custom settings you have set up for the lens using the optional USB Dock and free Sigma Optimization Pro software (which can also be used to update the lens' firmware, including changes to the autofocus algorithm).

I've previously stated that the specs on these two lenses are very similar - after having them in my hands for several days this statement seems almost like an understatement - these two lenses are similar overall (at least in a physical and "spec sense"). Having more diaphragm blades impacts on the quality of the out-of-focus (or OOF) zones. And, the Sigma case has backpack style straps on it.

Those wishing to review the detailed specs should go HERE for the Nikon 500mm f4E. But note that the Canon version of the Sigma 500mm f4 does NOT have an electronic diaphragm. 3.6 meters (11.8 feet) for the Nikon 500mm f4E and 3.5 meters (11.5 feet) for the Sigma 500mm f4. 2-mode VR system for the Nikon 500mm f4E (Normal vs. This adds an expense compared to having 8 or fewer diaphragm blades. In short, the Sigma case is actually quite functional and I can see a lot of owners using it as airline carry-on or even in the field. I can't speak for everyone else, but I can't imagine using the Nikon case for anything but putting the lens in when I sell it and need to ship it to someone else (which is the ONLY thing I ever did with the similar cases that came with my old and long-gone Nikkor 400mm f2.8G VR and my Nikkor 600mm f4G VR).

Note that I will be saying much more about how these compare (both theoretically and in practice) in the coming weeks. Here's what I've noticed so far: • AF Activation Buttons ((AKA "AF Function" Buttons on the Sigma 500mm): These are the four round buttons found around the lens near the distal (or far) end of it.

With BOTH lenses you can "program" the buttons to do 3 things: AF-On (activate the autofocus), AF-L (lock the focus when in AF-C or continuous focus mode), or return the lens to a preset focus distance (Memory Recall).

I have to say the Sigma rotates much more smoothly (as though it's on bearings and with no "play" whatsoever).

• Design/Appearance Differences: Both lenses are in a matte black finish and Nikon has chosen to gradually increase the width of the lens from the proximal portion that connects to the camera to the distal portion. This is one of those nebulous characteristics that defies definition but we all have a feeling for (reminds me of Pirsig's - from Zen and the Art of Motorcycle Maintenance - almost non-ending search for what "quality" means! But this is going to be a short section: both lenses seem absolutely EXCELLENT in build quality and I can't see anything on them that separates them from one another (other than perhaps how smoothly the Sigma lens collar rotates compared to the Nikon).

To get a feel for the specs of the Sigma Sport 500mm you have to visit both the spec list on (HERE) and the spec listing on the Sigma Photo website (HERE). A FEW Specification Highlights Here's a few of the more easily missed or overlooked specs that may be important to some photographers... Why is having an electromagnetic diaphragm significant? Sport settings) and 2-mode OS system for the Sigma 500mm f4 (OS1 = hand-held and OS2 = Panning). Primarily for weight saving (and it just so happens that the largest and heaviest lens elements on the Nikon are the fluorite ones). Nikon case: very nice and classy but pretty useless.