Amazon shipped me the wrong thing once and I initiated the return. They sent me a note and told me to keep the "wrong" item and they would ship me the correct one. Can't be MORE fair than that!!!

Very nice... Thanks for posting..

Do a GOOGLE image search.... definitely 1941 to 46 Chevy...

The 70/200 has a limit switch "FULL" or Infinity to 5m. Never used a "DOCK" or a SIGMA lens so I will investigate the "DOCK" and that certainly make comparisons (or use of "cheet" sheets) more difficult. Thanks for the input.

To perhaps expand (or better explain) my original post..... Recalling back in the 70's and 80's with the automotive gas mileage comparisons, still one of my favorite sayings (abbreviations, whatever) is YMMV (Your Mileage May Vary). I realize this is a problem "somewhat" unique to my target subject so that's why I was looking for a more general "index" to compare lens'. My "subjects" are typically about 100+mph on a circular track from 3/8ths to 1/2 mile. Typically arrive in clusters of 2 or 3 cars at a time and difficult to pan with due to constant traffic stream from right to left, hence the need for fast (quick?) focus. As far as advice from store personnel, they are often of "some" help but I have yet to find one that even knows what a Sprint Car is, so its difficult for them to relate. Is it a bird, or a plane.... no its a sprint car..... well you get the idea. I guess I was just canvassing UHH a bit to see if there were others in the audience that could help shed more light on my dilemma, I appreciate all the input but the bottom line here seems to be ... the current combination (D5/70-200) is pretty good and to do better I need to experiment more and perhaps do some Lens rentals to compare... Thanks again for your time.

Thanks for your thoughtful replies. I guess, as always, I was just looking for the "easy way out" and as I suspected ... there is NONE.... Appreciate all your input.

Thanks... good to know. Hate to ask those questions... wish there was a single place too see and compare. Appreciate your reply

First of all, the current body is a Nikon D5 and I have been told that the 70-200 is the "best" or some such statement but I was just curious as to how I could research this on my own or compare it to any new lens. Also as I stated I was wondering if there was any other "low light" lens that might be "comparable".

Thanks for you response.

Is there a straight forward way to compare lens focusing speeds. For several years I have been taking pictures of motorsports event. Most of them are cars on dirt 3/8ths mile to 1/2 mile tracks. Race cars typically are travelling at 100+ mph so focus speed is important. I normally use a 70-200mm lens. I have tried a few other lens and have spoken to some “camera store folks” about others in the size range I need. Again the one I use is a Nikon 70-200 2.8 lens. I shoot a lot at night/evening so am looking, perhaps, for a faster lens. For instance, the Sigma 135mm F1.8 DG HSM | A. (since I’m often shooting between 120 and 140 mm). There seems to be no resource that objectively provides focus speed (Not looking for a specific time of speed of acquisition just a relative speed or index that allows me to compare performance to what I have). Thanks for any help.

Freedom is NOT free (never was).....

Can't speak for concerts but "yes" for the "500" and supporting events...

Happened to see this today ... Quite by accident...FYI


https://www.amazon.com/dp/B004OCEYAC/ref=dra_a_cs_hp_hn_xx_P3310_100?tag=dradisplay-20&ascsubtag=061f346226295ce9a8ae9bcdf0128ebb_S

Welcome....