How to choose a photographic memory card

1. Selection of memory card type Some digital cameras can use multiple memory cards in the whole picture, which can be determined by referring to the camera manual. If there are other digital devices, you should choose the most common type. Canon's digital SLR cameras generally use CF ⅰ and CF ⅱ memory cards, which are compatible with micro hard disks. E SD card can also be used for holographic OS- 1 dsmark ⅱ and EOS-1dmark ⅱ n; The PowerShotPro, G and S series use CF Ⅰ and CF Ⅱ memory cards, and the DIGITALIXUS series and PowerShotA series use SD cards and MMC cards. Nikon generally uses CF Ⅰ and CF Ⅱ memory cards, which are compatible with micro hard disks, except for D50 SD cards. Nikon's Coolpix all use SD cards. Sony's products can only use memory chips, except F828, which supports CF cards and micro hard disks in addition to memory chips. Panasonic's few digital cameras use SD cards. Fuji and Olympus mainly use xD cards, but also use CF cards and micro-hard disk models. Generally speaking, CF card is the most widely used. 2. Brand Selection As far as the most widely used CF card is concerned, there are not many brands on the market. At present, there are three brands of CF cards on the market. One is the CF card holographic products produced by digital camera manufacturers themselves, such as Canon, Sony, Kodak, Nikon, Samsung and Toshiba. , which is characterized by better combination with its own digital camera products, but the price is generally more expensive than the second category below; The second category is the brands of memory manufacturers, including SanDisk, Lexus Kesha Rose Sebert, Kingston and Yu Zhan. These products are characterized by their professional services and technical support, and their prices are cheaper than those of the first category, so they are more attractive to users. The third category is all kinds of compatible memory cards, which are low in price and difficult to guarantee product quality and after-sales service. 3. Selection of speed With the holographic increase in the number of pixels of the image sensor used in digital cameras, the size of digital image files is correspondingly larger and larger. When these high-performance digital cameras take high-quality pictures, they need to quickly store the image files with the file size far exceeding 1M on the memory card, so the access speed of the memory card is particularly important. Different grades of memory cards may have great differences in access speed. For users who use high-end digital cameras, it is recommended to buy high-capacity high-speed cards, so as to truly reflect the performance of full-screen high-end digital cameras. For ordinary users who use low-end digital cameras, there is no need to choose a high-speed card. Limited by the processing speed of shooting data in low-end digital cameras, even with high-speed memory cards, the speed advantage is hard to show, and the actual test also shows the same result. For low-end digital cameras with low pixels and weak continuous shooting ability, it is difficult to detect the speed difference between high-speed card and low-speed card in actual shooting. 4. Selection of capacity When buying a digital camera, we usually get a small memory card at random. This capacity varies according to the grade of the camera, but it is generally small (below 32M), which is difficult to meet the daily shooting needs, so we usually buy a memory card with a larger capacity. For ordinary users who use a digital camera with more than 5 million pixels or an entry-level holographic digital SLR, it is recommended to select a memory card with a capacity of more than 5 12MB in one step. For professional and quasi-professional users who use professional and semi-professional digital cameras, because of the requirements of shooting quantity and shooting quality, it is best to buy one or more large-capacity memory cards 1GB, so that they can go out to shoot in a short time and save the trouble of carrying digital companions or laptops. 5. Compatibility issues There are also compatibility issues between digital cameras and memory cards. Incompatibility or poor compatibility is generally manifested in slow access speed and long card reading time, which will lead to data reading or writing errors, and even lead to digital camera crash. This kind of problem rarely appears in brand products at home and abroad, but there will be compatibility problems in brand-name products, so when buying memory cards, you need to bring a digital camera for actual testing. 6. Shopping Test When purchasing memory cards, you should try continuous shooting in uncompressed format (TIFF format or RAW format). After filling up the memory card, browse all the pictures to see if there are any problems. If there is no problem, the memory card is good. In addition, in terms of performance, it should be noted that the transmission speed of fake memory cards is much slower than that of genuine ones. Fake memory cards sometimes cause access errors, even crashes and other failures, and at the same time, the capacity will become smaller or damaged when used too much. Therefore, you can temporarily borrow genuine memory cards with the same or similar specifications to compare the number of photos taken in a unit time or the average shooting time of each photo. 7. Carefully check the authenticity and check the packaging work. The identification of true and false memory cards should start from the outer packaging. The outer packaging of brand-name or genuine memory cards is generally good. Generally, there are some problems with the outer packaging of fake cards. The full-face sticker on the table is yellow and illegible, and it feels inferior. In addition, check whether the accessories, such as card sets, instructions and write protection stickers, are complete. In the specific purchase process, in order to avoid buying second-hand memory cards, we must first confirm whether the packaging has traces of repackaging; After opening the package, confirm whether the trademark sticker on the surface of the memory card is stained; See if there are any scratches on the plastic shell around the memory card, especially if there are any obvious signs of inserting into the guide groove on both sides; Finally, see if the contact part of the memory card is scratched by the pin of the internal slot of the camera when it is inserted. This applies to memory cards other than CF cards and hard disks. If you check the above points and find no problems, you can basically determine that this card is a new card that has not been opened. 8. When purchasing after-sales service, it is recommended to buy products with well-known brands from big manufacturers. Most of these products promise to be replaced for one year or more.