Wonder if I could get some of your expert opinions on this?
I do quite a lot of amateur sport (kids stuff mainly but not exclusively) - football in the winter and cricket in the summer. I use the MD10 on my D300 and have always noticed the variability in the fps I get in burst mode. Now I understand this in football when the light is poorer and the action is faster moving but I see it with cricket in decent light as well.
I have both a general question and a specific one. The former is to ask what the variables are that influence the burst rate achieved in real-world usage (I'm guessing that AF is involved heavily) and what I can do to maximise what I get.
The specific questions is whether the length of time I hold the focus before pressing the shutter can influence this. I feel that with cricket, if I hold the focus in the batsman for several seconds it adversely effects the burst rate achieved. Could this be possible?
It doesn't actually bother me that much, but I am interested in understanding what goes on inside...
#1. "RE: D300 and burst mode" | In response to Reply # 0Mon 03-Jun-13 11:14 AM
What batteries are in the MB-D10?
What are the frame rates you are achieving (high to low)? You should be able to estimate this by looking at the EXIF time, including sub-seconds.
Are you shooting AF-C Focus Priority? (Custom Setting a1) That would be the most obvious and likely reason to see inconsistent burst speeds.
If you shoot Focus+Release Priority that might also slow it down although in practice I have not seen much difference between that and Release Priority.
>> The specific questions is whether the length of time I hold the focus before pressing the shutter can influence this. I feel that with cricket, if I hold the focus in the batsman for several seconds it adversely effects the burst rate achieved. Could this be possible?
Does not "make sense" nor have I ever seen anything like that.
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#4. "RE: D300 and burst mode" | In response to Reply # 1Mon 03-Jun-13 06:59 PM
Oh Neil, quick follow-up question if I may. I switch between AF-C and AF-S via the switch on the front of the camera. Presumably this over-rides the setting in the menu - or am I missing something here (wouldn't be the first time ).
#6. "RE: D300 and burst mode" | In response to Reply # 4Tue 04-Jun-13 11:11 PM
>> Presumably this over-rides the setting in the menu
If you mean custom menu a1 and a2, they determine what happens when the front AF Selector Switch is set to AF-S or AF-C. If you mean some other menu option, you need to be more specific.
my Nikonians gallery.
#2. "RE: D300 and burst mode" | In response to Reply # 0
To maximize the frame rate of your camera and grip, you need to maximize the speed of each part.
For the grip, you need to use either the big D3 battery (EN-EL4a) or the AA batteries. Using another of the camera batteries limits you to 5 fps.
For the camera, you need to turn off all the stuff that slows you down:
You will need a shutter speed of 1/250 or faster.
If you are shooting raw, use 12-bit files.
Auto ISO will cost you about 1/2 frame per second.
All noise reduction needs to be turned off.
If your lens has VR, it needs to be turned off.
Focus mode should be AF-continuous.
Release mode should be "release". "Focus-release" will slow you down but maybe not much.
Fewer focus points (21, 9, 1) are faster than more (51) but require you to do your part.
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#3. "RE: D300 and burst mode" | In response to Reply # 2Mon 03-Jun-13 06:55 PM
Thanks both, this is really interesting stuff.
I use eneloops in the grip and shoot in AF-C. I don't shoot sport in RAW. I need to look at my settings for noise reduction and ISO. I don't use 51 points.
I couldn't see the fps from exif data (or rather not sure how to calculate it). Sometimes the camera is like a machine gun going off, but sometimes it seriously stutters (and I thought I've focused properly on most of these occasions).
For cricket I am using the Sigma 150-500 which struggles a little at the outer end when it gets cloudy. Maybe this is all about the focus hunting even if I think I'm locked on?.
Anyway, it's very interesting to see all the things that could influence it.
#5. "RE: D300 and burst mode" | In response to Reply # 3dm1dave Nikonian since 12th Sep 2006Mon 03-Jun-13 07:11 PM
If you shoot in AF-C and custom setting a1: AF-C Priority Selection is set to Release then focusing cannot slow down the frame rate. The shutter will fire even if the camera is completely out of focus.
Check your shutter speeds – you must be above 1/250s.
High ISO noise reduction need to be OFF. (shooting menu)
Don’t use auto ISO
Make sure that Active D-Lighting is not enabled. (shooting menu)
#7. "RE: D300 and burst mode" | In response to Reply # 3Tue 04-Jun-13 11:31 PM
>> I couldn't see the fps from exif data (or rather not sure how to calculate it).
For a single continuous burst sequence, the frame rate is the capture time of the last frame, minus the capture time of the first frame, divided by the number of frames minus 1.
You must include the fractional sub-seconds in this computation. The camera *reports* to an accuracy of 2 decimal places. But keep reading. The number of decimal places a computer reports is not necessarily indicative of the real world accuracy of that number .
For example, you shoot 9 frames, and the difference between capture times is exactly 1 second. You are shooting at 8 fps.
And, of course, you can compute the frame rate for any number of consecutive frames within a burst.
If you are achieving precisely 8 fps then each frame is taken 0.125 seconds after the prior frame. So round off the reported two digit sub-second to 0.12 or 0.13 seconds. If each frame is indicated as about 0.12 seconds after the prior then you hit your target.
The above assumes the EXIF time is precisely accurate. I do not believe it is. When I have studied these capture times on frames I believe ran at 8 fps I see some strange capture intervals, I might see one frame indicated as 0.05s after the prior, which is an "impossible" 20 fps, but usually the next frame will be abnormally long, more like 0.2s, and the average will work out to about 0.12s per frame.
Just to say don't get excited about any strangeness between any two frames (i.e. any one capture time). It is the average time over a reasonable sequence of 4-6 shots or more that you are looking for.
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