Even though we ARE Nikon lovers,we are NOT affiliated with Nikon Corp. in any way.

English German French

Sign up Login
Home Forums Articles Galleries Recent Photos Contest Help Search News Workshops Shop Upgrade Membership Recommended
members
All members Wiki Contests Vouchers Apps Newsletter THE NIKONIAN™ Magazines Podcasts Fundraising

Image Buffer Size and Settings

GeorgCantor

Potomac, US
138 posts

Click to send email to this author Click to send private message to this author

"RE: Image Buffer Size and Settings"

GeorgCantor Silver Member Nikonian since 09th Dec 2012
Sun 23-Dec-12 11:38 PM

A lot of useful information here, from which i can draw conclusions, but i still have questions.

I am using the D7000 with a SanDisk UHS-1 95 MB/s Extreme Pro card, 32 MB, shooting RAW, 14 bit, lossless compressed, for sports & ballet. (Or RAW + JPEG)

Question 1: From the D7000 manual, page 320: RAW lossless compressed, 14 bit, file size = 19.4.MB. Is that megabits, or is it mega bytes. If megabytes, how many bits? (Wikipedia is confusing on that.) The buffer capacity is 10 of those files. That should yield the buffer size, should it not? Yet Nikon support said that Nikon does not publish the buffer size.


Question 2. I have read that the transfer rate to the card from the buffer is about 25 MP/sec. Another post referred to 45 MP/sec. Does anyone have further data?

Question 3. In either case, the 95 MP/sec card transfer rate would exceed the internal transfer rate. There seems to be a consensus that the excess of 95 over 45 is wasted in the camera, but not in a USB 3 card reader. Any further comment on this point?

Question 4. In post #20, I see the formula: 6*32/6)/(32/6+3) = 3.8 fps. Can the author please explain what the arguments of this formula rpesent (units, for example)

Question 5. Is it true that the camera is writing to the buffer, and from the buffer to the card at the same time? This appears to be true, from the very first post.)

Comment: ping-ponging between the two cards looks like a great idea. But i don;'t suppose we can expect Nikon to update the firmware for free, when they can expect to sell us a new camera with tat feature. or a bigger buffer. Or does someone know how to modify the firmware to achieve that result?

Question 6. I find the overall average frame rate computations interesting, but as a practical matter, what is important to me is: how much time does it take before the buffer fills and the camera drops to the "crawl" rate. The manual has specs as to how many frames this is (depending on shooting mode (p. 320), but not timing. If I am shooting 6 frames/sec in RAW, it would take 10/6 = 1.67 sec to fill the buffer -- unless the buffer is writing out to the card at the same time, in which case it would take longer to fill the buffer, depending on both the write rate to the buffer and the write rate to the card. Right? The object is to estimate how much time it takes to avoid shooting long enough for the buffer fill and drop the exposure rate to the crawl rate. This would, for me, be the practical limit on the number of burst shots I could take at 6 fps..

Thank you all.

Visit my Nikonians gallery.

Visit my Nikonians gallery.

Visit my Nikonians gallery.

This is a hot, active topic! Image Buffer Size and Settings [View all] , DeanAZ Gold Member Expert nature photographer , Sat 08-Jan-11 03:57 AM
Subject
ID
Reply message RE: Image Buffer Size and Settings
1
Reply message RE: Image Buffer Size and Settings
2
Reply message RE: Image Buffer Size and Settings
3
Reply message RE: Image Buffer Size and Settings
4
     Reply message RE: Image Buffer Size and Settings
5
     Reply message RE: Image Buffer Size and Settings
8
     Reply message RE: Image Buffer Size and Settings
6
          Reply message RE: Image Buffer Size and Settings
7
               Reply message RE: Image Buffer Size and Settings - Firmware Change
9
                    Reply message RE: Image Buffer Size and Settings - Firmware Change
10
                    Reply message RE: Image Buffer Size and Settings - Firmware Change
11
                    Reply message RE: Image Buffer Size and Settings - Firmware Change
25
                    Reply message RE: Image Buffer Size and Settings - Firmware Change
22
                    Reply message RE: Image Buffer Size and Settings - Firmware Change
35
Reply message My new UHS-1 Card arrived
12
Reply message RE: My new UHS-1 Card arrived
13
Reply message RE: My new UHS-1 Card arrived
14
     Reply message RE: Image Buffer Size and Settings
15
          Reply message RE: Image Buffer Size and Settings
18
Reply message RE: My new UHS-1 Card arrived
26
Reply message RE: My new UHS-1 Card arrived
38
Reply message RE: My new UHS-1 Card arrived
39
Reply message RE: Image Buffer Size and Settings
16
Reply message RE: Image Buffer Size and Settings
17
     Reply message RE: Image Buffer Size and Settings
19
          Reply message RE: Image Buffer Size and Settings
20
Reply message RE: Image Buffer Size and Settings
21
Reply message RE: Image Buffer Size and Settings
23
Reply message RE: Image Buffer Size and Settings
24
     Reply message RE: Image Buffer Size and Settings
27
Reply message RE: Image Buffer Size and Settings
28
     Reply message RE: Image Buffer Size and Settings
29
          Reply message RE: Image Buffer Size and Settings
30
               Reply message RE: Image Buffer Size and Settings
31
                    Reply message RE: Image Buffer Size and Settings
32
                         Reply message RE: Image Buffer Size and Settings
33
Reply message RE: Image Buffer Size and Settings
34
Reply message RE: Image Buffer Size and Settings
36
Reply message RE: Image Buffer Size and Settings
37
Reply message RE: Image Buffer Size and Settings
40
Reply message RE: Image Buffer Size and Settings
41
Reply message RE: Image Buffer Size and Settings
42
     Reply message RE: Image Buffer Size and Settings
43
     Reply message RE: Image Buffer Size and Settings
44
          Reply message RE: Image Buffer Size and Settings
45
Reply message RE: Image Buffer Size and Settings
46
Reply message RE: Image Buffer Size and Settings
47
     Reply message RE: Image Buffer Size and Settings
48
          Reply message RE: Image Buffer Size and Settings
49
          Reply message RE: Image Buffer Size and Settings
50
               Reply message RE: Image Buffer Size and Settings
51
          Reply message RE: Image Buffer Size and Settings
52
               Reply message RE: Image Buffer Size and Settings
53
                         Reply message RE: Image Buffer Size and Settings
55
                              Reply message RE: Image Buffer Size and Settings
56
                                   Reply message RE: Image Buffer Size and Settings
57
                                        Reply message RE: Image Buffer Size and Settings
58
                                        Reply message RE: Image Buffer Size and Settings
59
                                        Reply message RE: Image Buffer Size and Settings
60
                                             Reply message RE: Image Buffer Size and Settings
61
                                                  Reply message RE: Image Buffer Size and Settings
62
                                                  Reply message RE: Image Buffer Size and Settings
63
Reply message RE: Image Buffer Size and Settings
64
Reply message RE: Image Buffer Size and Settings
65
Reply message Secrets revealed...
66
Reply message RE: Secrets revealed...
67
     Reply message Well, even if the D7100 uses the same chip...
68
          Reply message RE: Well, even if the D7100 uses the same chip...
69
               Reply message RE: Well, even if the D7100 uses the same chip...
70
               Reply message Or you bought the wrong cards David!
72
               Reply message RE: Or you bought the wrong cards David!
73
               Reply message RE: Well, even if the D7100 uses the same chip...
75
               Reply message RE: Well, even if the D7100 uses the same chip...
71
                    Reply message RE: Well, even if the D7100 uses the same chip...
74
Reply message RE: Image Buffer Size and Settings
76
Reply message RE: Image Buffer Size and Settings
77
Reply message RE: Image Buffer Size and Settings
78
     Reply message RE: Image Buffer Size and Settings
79
          Reply message RE: Image Buffer Size and Settings
80
               Reply message RE: Image Buffer Size and Settings
81
               Reply message RE: Image Buffer Size and Settings
84
                    Reply message RE: Image Buffer Size and Settings
85
               Reply message RE: Image Buffer Size and Settings
82
                    Reply message RE: Image Buffer Size and Settings
83