Igor, Your question led me to doubt my memory of the last test I did with the Ultra II SD card so I ran the test a second time with the Sandisk Ultra II card, 60x nominal speed, for both RAW and JPEG *** and updated the page with these additional results and corresponding QuickTime movies.
http://homepage.mac.com/godders/Pentax-DS-150x-timing/ There is no measured improvement on RAW capture performance. The improvement on JPEG *** captures going to the Transcend 150x card is a 3 frames in 60 seconds, about 3.4% total improvement. Not a lot ... I retract the "substantial" judgement. Amusingly, the price of Transcend 150x 2G SD cards is barely more than half the price of Sandisk Ultra II 2x SD cards. This justifies my prior feelings: that there is very little benefit to in-camera performance with a card faster than the Sandisk Ultra II for the *ist DS body. Godfrey On Jul 13, 2006, at 8:02 PM, Igor Roshchin wrote: > > Hi Godfrey, > > This is an interesting test. I've done like this once before with > a couple of SanDisk 1GB cards (Ultra II and a yellow gaming card), > and reported them here. (I did only tests for RAW.) > In a similar setting, the time required for the first 5 shots to be > fully recorded was 19 seconds. In your case this is 16 seconds. > So, you see about 19% increase in the recording rate. > (The corresponding rates are ~2.6 MB/s and 3.1 MB/s. > Ghm.. I thought, previously I was getting a somewhat larger number. > I hope I am not making some mistake now.) > > I don't know what are the numbers for JPEGS with Ultra II, but > I am not sure why you are saying that the difference for JPEG format > is much larger than that for RAW format? > I suspect that the recording rate should be the same regardless of > the format, and it is only the file size that is different (if we > discount the time required for conversion/compression as being > negligibly small). > > Maybe I didn't understand what you meant. Do you mind explaining > the last sentence below? > > Thank you, > > Igor > > PS. It is rather interesting that there is a change in the exposure > from shot to shot. > > > Thu, 13 Jul 2006 15:15:47 -0700 > Godfrey DiGiorgi wrote: > >> I bought a couple of Transcend 150x 2G SD cards (at $40 apiece, I >> couldn't resist). >> So I figured I'd revisit the timings we played with in May ... >> >> There is an improvement over 80x cards, not so much for RAW but >> substantial if capturing in JPEG *** format. -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net
