tag:blogger.com,1999:blog-5826231802859523569.post1006893698620382447..comments2024-02-12T03:21:03.402-08:00Comments on Ron Martinsen's Photography Blog: GUEST REVIEW: Sigma 120-300mm tested by a Canon 200-400mm owner by Joseph Calevronmartblog.comhttp://www.blogger.com/profile/06815090271742112506noreply@blogger.comBlogger3125tag:blogger.com,1999:blog-5826231802859523569.post-31421218533505003722014-03-18T13:35:33.589-07:002014-03-18T13:35:33.589-07:00Russ,
Here's a response from Joe for your com...Russ,<br /><br />Here's a response from Joe for your comment:<br /><br />- I agree with you about better AF on the better Canon teles<br />- In terms of the USB hub, if Sigma really thinks that I am going to hook up a laptop to my lens while I am photographing in the field in the pouring rain then they really need to learn about their photographers. I photograph a wide variety of things. That's why I own a 200-400 instead of a 600/4 or 400/2.8. I am not going to reconfigure my lens for each thing. If Sigma wants me to gush about flexibility, then put the functionality in buttons on the lens itself.<br />- In terms of adjusting the AF speed using the USB hub, why the hell do I need to do that? If the AF speed can be increased, then do this as the factory default. It's like buying a Ferrari only to find out that it only goes max 50 mph but that can be increased with a tune up.<br /> <br />BTW, today I managed a pretty good example of what a 5D3 + 200-400 with the 1.4x engaged can do. I managed about 15 shots of violet-green tree swallows in flight. This is a bird ~12 cm that is travelling at 40 km/h. That ain't going to happen with the Sigma... :)<br /> <br />ronmartblog.comhttps://www.blogger.com/profile/06815090271742112506noreply@blogger.comtag:blogger.com,1999:blog-5826231802859523569.post-88266629844256526982014-03-12T23:47:56.895-07:002014-03-12T23:47:56.895-07:00Russ,
You are correct, Joe didn't, but I did...Russ, <br /><br />You are correct, Joe didn't, but I did. See http://www.ronmartblog.com/2014/01/review-sigma-usb-dock-10.html<br /><br />Now I've noticed that "fast" is very subjective because it's based on what you are used to. If you are using other Sigma, Tamron, or older Canon lenses then by that definition this lens would be fast at auto focusing. If you compare it to the latest generation of Canon sports lenses then this lens is very slow at auto focusing - even with USB dock adjustments. ronmartblog.comhttps://www.blogger.com/profile/06815090271742112506noreply@blogger.comtag:blogger.com,1999:blog-5826231802859523569.post-48697804460131493482014-03-12T20:59:23.230-07:002014-03-12T20:59:23.230-07:00One problem is that you are not using the lens to ...One problem is that you are not using the lens to its potential. Slip on the USB dock, dial in faster focus - and boom, faster focus. Dial in focus adjustments at 4 different focal lengths (at different distances too iirc). Dial in different minimum focus distances etc. No other manufacturer can do that.<br /><br />I've done a few rugby games with it, with the 1.4x both on and off (hardly noticed a difference) and focus was fast and accurate. Did some cricket with the 2x on, I was surprised how good the focus was, fast (considering) and accurate, images a bit soft but that's to be expected.Russhttps://www.blogger.com/profile/05604409661802860186noreply@blogger.com