It's overrated, use medium format.

I use it when there are varying lighting conditions and I want a certain speed and DOF. Usually walking in the woods shooting wildlife.

Hey, I resemble that....

very nice! We just returned from Pigeon Forge (actually Wears Valley)
where we spent the last week on vacation.

whew!!! My, my they are proud of their lenses. 100th anniversary should be give aways, not overpriced products.

I see that, but that doesn't look like artifacts to me.

I use manual when it suits my purpose. Most of the time, I'm not in a hurry, so I have time to dial in the aperture, shutter speed and ISO. Most of the time, I want to see how one effects the other in the exposure triangle. For instance, when using 600mm lens, I want minimum 640 Shutter speed. I like the aperture to be between f8 to f11 and let the ISO land wherever. This setup helps me when I get in different lighting conditions frequently during the shooting session. Having an auto-ISO setting is something that still intrigues me since it wasn't available with film. I get a lot of satisfaction out of it. But, I don't use manual because it's the cool thing to do. It's just another method to tinker with.

the Tamron is a great SP lens. I don't know anything about the Sigma but have read it is also a good lens.

I don't see them when I download the photo. My guess is jpg format is causing it.

nice capture

I like the 28-300mm lens as an all purpose lens.

I don't see anything wrong with the images. The colors and patters of the background will dictate the look.

If you have the camera set to only fire the shutter when it finds focus, the D750 will shoot fast as long as it is in focus. As has been mentioned, if the lighting is good, increase the shutter speed and turn VC off.

I had the same situation with a Tamron 28mm-300mm zoom. I had it exchanged with no issues from Adorama. Dust will get into the lens eventually, but why start out that way.

agreed