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In a YouTube video Taking Better FinishLynx Images, Lynx founder, Doug DeAngelis, suggested these three F-mount lenses would cover most situations.

35 mm f/1.4
50 mm f/1.4
85 mm f/1.8

Theses fast fixed lenses allow more light than zoom lenses. You do not need the automatic features found on new lens. Used, but perfectly good, F-mount lenses are available on eBay and elsewhere for around $150.

Hope this helps. -- Justin
Thank's for your reply. I saw that video how to improve my photo finish. In road cycling, light is not a big problem, the major problem is the difference of finish line wide distance we can work from different races. Some times, finish line is really narrow but other time, it large like a 3-4 lanes for car... That's why have a zoom with the lens make it interesting because you can zoom and make the cyclist as big as possible (zoom in) to make it easier to read and to work.

I had the chance to work with a fixed lens and zoom lens, even inside then outside and I prefer to work with the zoom one. Now the challenge it to find lens with old technology and with full frame. More and more lens are for digital camera with auto-focus motor and no more aperture manual settings. So if you want to adjust the camera, you have to open the aperture by the computer first and then to reach the camera and complete your alignment and your focus to finally come back to the computer and finalize the aperture adjustment with the computer...
Adding my $0.02. I personally use fixed lens for my operations. In my arsenal I have a 35mm f/1.8, 50mm f/1.4, and the Sigma 28-70 mm lens that I got when I purchased my camera. For 90% of the road cycling events that I do I use my 35mm f/1.8 lens. It produces very clear images. Sometimes I get to use my 50 mm for a road race but that lens is primarily used at the velodrome.

I almost always use a density of 1,000 for races that I do. If I know the finish line is going to be wide at an event, I'll go rent a wide angle lens like the Nikon 24mm f/1.4. I so want to buy this lens. Super wide angle - big aperture. But, at $2,200 it is a little pricey. At a velodrome event this summer I had 2 cameras working the finish line. One camera had a 35mm f/1.4 while the other had a 24mm f/1.4. I had some awesome images from these two lenses.

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