SD---SDHC?
AF - Pentax K5, Sigma 10-20/4-5.6, Tamron 17-50/2.8, Sigma 30/1.4, Sigma 70-200/2.8, Tamron 70-300/4-5.6
MF - Vivitar CF 28/2.8, Tamron AD2 90/2.5, MTO 1000/11
Stuff - Metz 58 AF1, Cactus v4, Nikon SB24, Raynox 150, Sigma 1.4x TC, Sigma 2x TC, Kenko 2x macro TC, Redsnapper 283 tripod, iMac 27”, Macbook Pro 17”, iPad, iPhone 3G
Flickr • Fluidr • PPG • Street • Portfolio site
Feel free to edit any of my posted photos! If I post a photo for critique, I want brutal honesty. If you don't like it, please say so and tell me why!
Bret
Paul
-------------------------------------------------------
Photography is an index for measuring futility and pride.......
Paul
:wink
http://s743.photobucket.com/home/pg20_photos/index https://www.flickr.com/photos/pg20
I hope that makes sense, though it'll probably sound more like incoherent engineering babble
btw I wonder why they didn't make the 645D SDXC ready
Bret
my kit: K3, K5, K-01, DA 18-55, D-FA50 macro, Siggy 30/1.4, 100-300/f4, 70-200/2.8, Samsung 12-24/f4, Tamron 17-50, and lots of other bits.
Whelmed I believe all cards sizes have a -1 byte so it shouldn't be a problem.
btw I wonder why they didn't make the 645D SDXC ready
It may be ...
I believe that SDHC devices which support SDXC cards provided they meet certain criteria and the exact implementation of the spec.
K20D, *istD, MZ-S, Super-A, ME Super, MX
DA* 16-50, DA* 50-135, DA* 300,
DA 50-200, FA 24-90, FA 20-35,
M 400-600, A 50 f1.4, A 28 f2.8, A 70-210, M 35-80, M 50 f1.7
A x2S teleconverter and a few others ...
No such luck. I'm as confused as ever. Not to worry though I've got 2 of them and they work so that's OK. CHEERS Vic.
Standard-SD cards (non-SDHC) with greater than 1 GB capacity
The SD Card Association's current specifications define how a standard SD (non-SDHC) card with more than 1 GB and up to 2 GB capacity should be designed. These cards should be readable in any SD 1.01 devices that take the block length data into account. Any 1 GB or lesser card should always work (so the key question is how one's reader handles block length).
According to the specification, the maximum capacity of a standard SD card is defined by (BLOCKNR x BLOCK_LEN), where BLOCKNR may be (4096 x 512) and BLOCK_LEN may be up to 2048. This allows a capacity of 2 GB. The main problem is that some of the card readers support only a block (aka. sector) size of 512 bytes, so greater than 1 GB non-SDHC cards may cause compatibility difficulties for users of such devices.
SD and SDHC compatibility issues
The SDHC specification was completed in June 2006, but by that time, non-standard high-capacity (>1GB) SD cards (based on the older 1.x specification) were already on the market. The two types of storage cards were not interchangeable, creating some confusion among customers. SD and SDHC cards and devices have these compatibility issues :
- Devices that do not specifically support SDHC do not recognize SDHC memory cards. Some devices can support SDHC through a firmware upgrade.
- SDHC devices are backward compatible with SD memory cards.
- Some manufacturers have produced 4 GB SD cards that conform to neither the SD2.0/SDHC spec nor existing SD devices
Add Comment
To leave a comment - Log in to Pentax User or create a new account.
2041 posts
16 years
Kettering Northants