BangBangBoy Goldmember  1,347 posts Joined Nov 2010 Location: South Africa More info | Mar 26, 2013 09:20 | #1 Hi guys/gals. Lots of old stuff but hey I am a student
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dick.steel Hatchling 1 post Joined Feb 2013 More info | Mar 26, 2013 11:04 | #2 Same here, seems normal with this lens.
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caoko Senior Member 260 posts Joined Aug 2012 More info | Mar 26, 2013 12:51 | #3 what about in MF mode?
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msowsun "approx 8mm"  More info | Mar 26, 2013 18:33 | #4 Manual focus and One-Shot focus are fine. It is only AI Servo that causes the slow-down. It is a physical limit due to the design of the older Arc-Form Drive AF lenses. I have recently noticed that my older EF Arc-Form Drive lenses will cause the frame rate to drop to about 4fps on my 40D when shooting in "AI SERVO". Even with a stationary subject and the camera on a tripod. This doesn't happen in "ONE SHOT". In "AI FOCUS" I will get 6.5fps, but as soon as the subject moves, it again slows to 4ps or less. Can you please explain why this is so? Mike Sowsun Except for the EF80-200mm f/2.8L and EF20-35mm f/2.8L, all other EF lenses with AFD (Arc Form Drive) focusing motors were designed in such a way that autofocusing and diaphragm operation (via the Electromagnetic Diaphragm, or EMD for short) were carried out sequentially rather than simultaneously. This has no impact on continuous sequences in One-Shot AF, because no autofocusing occurs after the initial AF lock in this mode. But in AI Servo, both the focus and the diaphragm are operated for each photo, and consequently the camera's framing rate decreases. For what it's worth, AFD motors were phased out of the EOS system for all new lenses introduced from 1990 onwards. Best Regards--Chuck Westfall Mike Sowsun / SL1 / 80D / EF-S 24mm STM / EF-S 10-18mm STM / EF-S 18-55mm STM / EF-S 15-85mm USM / EF-S 55-250mm STM / 5D3 / Samyang 14mm 2.8 / EF 40mm 2.8 STM / EF 50mm 1.4 USM / EF 100mm 2.0 USM / EF 100mm 2.8 USM Macro / EF 24-105mm IS / EF 70-200mm 2.8L IS Mk II / EF 100-400 II / EF 1.4x II
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Mar 27, 2013 09:45 | #5 Thanks bru! Lots of old stuff but hey I am a student
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