Paul, thanks for the real-world experience report. Alan, your link and the test reported there and Larry, your “test” suggesting how to do a comparison will both be quite useful. By inclination I do like to try things out to see what happens. In this case I was hung up on the write speed of a single image. But ahah, shooting continuous, looking for how long to a full buffer, counting the number of captures to that point… I can do that.
stan > On May 29, 2018, at 1:52 PM, Larry Colen <[email protected]> wrote: > > > > Stanley Halpin wrote on 5/29/18 10:13 AM: > >> Question: Is there any reason not to mix-and-match? I pretty much always >> have cards with the same speed rating in both card slots, but I don’t know >> if I am being a bit too compulsive… >> And I would guess that if I did mix them, that it would make sense (?) >> for the faster card to be placed in the slot where the larger RAW files are >> being written. > > It is my understanding that at those rates it is not the card speed that is > the limiting factor. If you're driving down a heavily patrolled freeway and > you have your choice of a Corvette, a Ferrari or a McLaren it doesn't really > matter if one tops out at a 178 MPH, another at 167 and the third at 153, > with all those cops, it's hard to do much more than 100 for very long. > > In a similar sense, the limiting factor in the camera with those cards is the > bus speed. I don't remember the details, but I don't think the camera can > maintain much better than about 60Mbps. It's further complicated by some > cards (because of buffering?) can store a little bit of data at a much higher > rate than they can store data at a sustained rate, and it's that burst rate > that is usually advertised. There are other ratings (for video) that list > the sustained rate that they can store data. > > In short, if you only shoot a few photos at a time, then the burst rate is > more critical, if you shoot action and take photos fairly continuously, then > the sustained rate is more critical. > > In your case, the way to test would be to put the camera in high speed motor > drive mode, hold the shutter down, count how many frames you can take until > the buffer fills, then measure how long until the "write" light goes out. If > there is no substantial difference between each of the cards, it doesn't > matter. > >> Thanks! >> stan -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
