Bonjour,

La vitesse d'écriture sur SD est effectivement plus lente, mais tu ne sentiras la chute de vitesse que quand ton buffer sera plein, le remplissage du buffer sera limité par le vidage sur la carte, donc si tu es en one-shot ou que tu utilises de petites rafales cela ne devrait pas te perturber outre mesure. Maintenant si tu es un adepte des rafales de plusieurs secondes ....

Si tu veux une sécurité, je te conseillerais d'utiliser le même format sur les 2 cartes le ralentissement sera moindre.

Regardes la page https://www.cameramemoryspeed.com/ca...rd-speed-test/ les tests sont fait avec des rafales de 30s justement pour être sur de remplir le buffer et voir la limitation de vitesse en écriture sur les cartes
"Since the Canon 5D Mark IV has two card slots, various combinations of using two cards in the camera were tested. In these tests the Lexar Professional 1066x 32GB and SanDisk Extreme Pro 95MB/s U3 32GB cards were used. First, writing to both cards in backup mode the camera was able to capture images up to the speed of the slower of the two cards, in this case it was limited by the SD card. In 30 seconds of shooting the camera captured 47 shots RAW+JPEG, 72 shots RAW and 184 shots JPEG, nearly the same as shooting to the SD card only.

The second test was recording separately, RAW to the CF card and JPEG to the SD card. In this test up to 71 shots were captured in 30 seconds of continuous shooting. This is below the 99 RAW that can be taken when shooting RAW only to the CF card, but above the 67 shots when writing both RAW and JPEG to the CF card."