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Nikon DSLR Cameras
D7100
What SD card for the D7100?
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<blockquote data-quote="WayneF" data-source="post: 193431" data-attributes="member: 12496"><p><span style="font-size: 12px"></span></p><p><span style="font-size: 12px"></span></p><p><span style="font-size: 12px">You need to understand the ratings used on the cards. The 30MB ratings apply to the<strong> read speed</strong>, when in your computer USB slot, if the USB is fast enough. The write speed is more nearly the Class 10 number, which means 10MB/second, minimum. Technically, Class 10 means the slowest of Read or Write is at least 10MB/second, but which is always Write.</span></p><p><span style="font-size: 12px"></span></p><p><span style="font-size: 12px">Your link to the Ultra card says: <span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="color: #424242"><span style="font-family: 'arial'"><span style="color: #424242">Speed : <strong>up to 30MB/s read speed; write speed lower</strong> (write speed is always slower).</span></span></span></span></span></span></span></span></span></span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="color: #424242"><span style="font-family: 'arial'"><span style="color: #424242"></span></span></span></span></span></span></span></span></span></span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="color: #424242"><span style="font-family: 'arial'"><span style="color: #424242">30MB/sec is about a 200X card. The X number is read speed too, being this X times 150KB/second, the original CD read speed. The memory card speed rating system probably could be improved today. </span></span></span></span></span></span></span></span></span></span></span><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big grin :D" loading="lazy" data-shortname=":D" /><span style="font-size: 12px"><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="color: #424242"><span style="font-family: 'arial'"><span style="color: #424242"> The write speed is not well specified, since it so much depends on the device doing the writing.</span></span></span></span></span></span></span></span></span></span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="color: #424242"><span style="font-family: 'arial'"><span style="color: #424242"></span></span></span></span></span></span></span></span></span></span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="color: #424242"><span style="font-family: 'arial'"><span style="color: #424242">Here is <a href="http://www.robgalbraith.com/camera_wb_multi_page2db9.html?cid=6007-12454&sort_col=jpeg&sort_dir=DESC" target="_blank">good link to card write speeds</a> in cameras:</span></span></span></span></span></span></span></span></span></span></span></p><p><span style="font-size: 12px"><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="color: #424242"><span style="font-family: 'arial'"><span style="color: #424242"></span></span></span></span></span></span></span></span></span></span></span></p><p>It says the Sandisk Ultra card write speed measures 13MB/second in the D7000 camera (other cameras may have different speeds). That would qualify for Class 10 being minimum of 10 MB/sec.</p><p></p><p><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="color: #424242"><span style="font-family: 'arial'"><span style="color: #424242">Now a D7100 JPG might be 16MB size, so this 13MB/sec speed should take about about 1.2 second to write. A burst of 5 files would take about 5x16/13 = 6 seconds to finish writing. A Raw file may be around 30MB, so it would take 2.3 seconds to write on this card. The test chart above says the D7000 can write 27MB/sec with a fast enough card (if that might be important). That is a 95 MB/sec card, which again is read speed, but to which the D7000 can write 27MB/sec, it says (it is reliable). If you only take one image every minute or so, how could it matter?</span></span></span></span></span></span></span></span></span></span></p><p><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="font-family: 'arial'"><span style="color: #424242"><span style="font-family: 'Arial'"><span style="color: #424242"><span style="font-family: 'arial'"><span style="color: #424242"></span></span></span></span></span></span></span></span></span></span></p><p>But for example, the D800 can write about 69 MB/second to the fastest compact cards. It can depend on what is doing the writing.</p><p></p><p>Video is much slower, it has the entire recording time to write the file, and any Class 10 card is plenty for video. Faster cannot help video (it only records so fast).</p></blockquote><p></p>
[QUOTE="WayneF, post: 193431, member: 12496"] [SIZE=3] You need to understand the ratings used on the cards. The 30MB ratings apply to the[B] read speed[/B], when in your computer USB slot, if the USB is fast enough. The write speed is more nearly the Class 10 number, which means 10MB/second, minimum. Technically, Class 10 means the slowest of Read or Write is at least 10MB/second, but which is always Write. Your link to the Ultra card says: [FONT=Arial][FONT=arial][COLOR=#424242][FONT=Arial][FONT=arial][COLOR=#424242][FONT=Arial][COLOR=#424242][FONT=arial][COLOR=#424242]Speed : [B]up to 30MB/s read speed; write speed lower[/B] (write speed is always slower). 30MB/sec is about a 200X card. The X number is read speed too, being this X times 150KB/second, the original CD read speed. The memory card speed rating system probably could be improved today. [/COLOR][/FONT][/COLOR][/FONT][/COLOR][/FONT][/FONT][/COLOR][/FONT][/FONT][/SIZE]:D[SIZE=3][FONT=Arial][FONT=arial][COLOR=#424242][FONT=Arial][FONT=arial][COLOR=#424242][FONT=Arial][COLOR=#424242][FONT=arial][COLOR=#424242] The write speed is not well specified, since it so much depends on the device doing the writing. Here is [URL="http://www.robgalbraith.com/camera_wb_multi_page2db9.html?cid=6007-12454&sort_col=jpeg&sort_dir=DESC"]good link to card write speeds[/URL] in cameras: [/COLOR][/FONT][/COLOR][/FONT][/COLOR][/FONT][/FONT][/COLOR][/FONT][/FONT][/SIZE] It says the Sandisk Ultra card write speed measures 13MB/second in the D7000 camera (other cameras may have different speeds). That would qualify for Class 10 being minimum of 10 MB/sec. [FONT=Arial][FONT=arial][COLOR=#424242][FONT=Arial][FONT=arial][COLOR=#424242][FONT=Arial][COLOR=#424242][FONT=arial][COLOR=#424242]Now a D7100 JPG might be 16MB size, so this 13MB/sec speed should take about about 1.2 second to write. A burst of 5 files would take about 5x16/13 = 6 seconds to finish writing. A Raw file may be around 30MB, so it would take 2.3 seconds to write on this card. The test chart above says the D7000 can write 27MB/sec with a fast enough card (if that might be important). That is a 95 MB/sec card, which again is read speed, but to which the D7000 can write 27MB/sec, it says (it is reliable). If you only take one image every minute or so, how could it matter? [/COLOR][/FONT][/COLOR][/FONT][/COLOR][/FONT][/FONT][/COLOR][/FONT][/FONT] But for example, the D800 can write about 69 MB/second to the fastest compact cards. It can depend on what is doing the writing. Video is much slower, it has the entire recording time to write the file, and any Class 10 card is plenty for video. Faster cannot help video (it only records so fast). [/QUOTE]
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What SD card for the D7100?
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