Thank you for the excellent comments matrix and alpheios, very good info and thoughts. If I had had a back up card in my camera the other day I would not have miss about 50 shoots that were the main ones I wanted. I would like to thank all on this forum who have made and effort to answer my questions and give me good and wise advice. Thank you so much
---------- Post added 11-28-15 at 10:08 AM ----------
Originally posted by jatrax You have three choices:
1) Sequential: writes to card 1 until it is full and then writes to card 2. Can be RAW or jpeg.
2) Both cards: writes to both cards, can be RAW or Jpeg but both cards get the same. This is useful for things like wedding work where having a card fail is unthinkable. So having them mirrored gives you an instant backup.
3) RAW+ : one card gets the RAW file, the other gets a jpeg. This is used if you need the jpegs to view quickly or for instant upload like news reporting, but still want the RAW for further development.
This is so clear and very good into jatrax, thanks
---------- Post added 11-28-15 at 10:10 AM ----------
Originally posted by alpheios It's for safety/backup. Well let's say you have been hired to shoot a wedding. It's a wonderful day, you shoot lots of great photos. At the end of the day you put the card in your computer and find out that something is terribly wrong with the card and all the photos are either gone or useless. I think the newly married couple wouldn't be to happy about the fact that there are no photos of their special day in life.
All memory cards, even the good ones like i.e. Sandisk can fail. And losing photos of an unique event that can not be repeated is probably the worst nightmare of every photographer.
I love the wisdom of your comments and you are so right. I do a lot of landscape for my city and various other event shoots and your comments will save me a world of hurt, thank you alpheios