How Much Camera Memory Do I Need
Digital cameras are seldom supplied with retentivity cards these days, partly because the cards that were one time supplied are woefully inadequate for today'south camera resolution levels and partly because many digicams come with born memories where pictures tin can exist stored.
How Much Memory Do You Require?
Digital cameras are seldom supplied with memory cards these days, partly considering the cards that were once supplied are woefully inadequate for today'southward photographic camera resolution levels and partly because many digicams come with built-in memories where pictures can be stored. Unfortunately, these internal memories are frequently relatively modest so new photographic camera purchasers should always purchase at least one loftier-chapters card when they purchase a new camera.
Purchasing a digital camera normally locks yous to a specific menu blazon, with Secure Digital (SD), Retention Stick (MS) and xD-Picture Cards most popular among digicams and CompactFlash (CF) and SD cards for DSLRs. A few cameras have ii card slots and some models take a single slot that will accept two dissimilar types of cards (for example, xD and SD).
Some cameras have dual slots that will accept different types of cards. With more sophisticated cameras it is usually possible to transfer image files between cards and make up one's mind which card
Prices of all memory cards have plummeted since mid-2006, making high-capacity cards affordable to fifty-fifty the most cash-strapped photographers. When we went to press you could buy a 1GB SD card for less than $thirty.
In this chapter we'll outline typical capacities for a range of retentiveness cards and provide guidance on how much memory you require for some typical shooting situations.
How Many Images Can Yous Shop?
The table below shows the approximate number of pictures popular memory cards tin store for digicams of different resolution levels. The figures provided are based on JPEG images from meaty digicams, taken at the highest resolution and quality settings.
| Camera Resolution | 256MB | 512MB | 1GB | 2GB | 4GB | 8GB |
| 5 megapixels | 95 | 195 | 395 | 800 | 1595 | 3160 |
| 6 megapixels | 88 | 178 | 343 | 698 | 1400 | 2744 |
| seven.1 megapixels | 80 | 160 | 320 | 640 | 1280 | 2560 |
| 8 megapixels | 69 | 143 | 290 | 582 | 1164 | 2320 |
| 10 megapixels | 53 | 100 | 205 | 410 | 821 | 1640 |
| 12 megapixels | 37 | 75 | 152 | 305 | 606 | 1214 |
The actual number of pictures that can be stored on a carte du jour volition depend on the camera model and how much the JPEG files are compressed. Some cameras apply higher pinch ratios that others. Card capacities volition be significantly higher when lower resolution/quality settings are used.
Photographers who apply DSLR cameras volition observe they need higher storage capacity – especially if they shoot raw files. For this reason, nosotros recommend at least a 1GB card. The table above gives the approximate capacities for loftier-resolution JPEG files at a pinch ratio of ane/iv from typical DSLR cameras.
| Photographic camera Resolution | 1GB | 2GB | 4GB | 8GB |
| 6 megapixels | 330 | 660 | 1320 | 2640 |
| 8 megapixels | 266 | 532 | 1064 | 2128 |
| 10 megapixels | 202 | 409 | 804 | 1700 |
| 12.8 megapixels | 147 | 294 | 588 | 1176 |
Compression ratios vary for raw files, although all manufacturers provide lossless compression. For example, 10-megapixel raw files can range in size from 17.66MB to 9.8MB, depending on the file format used and the degree of compression applied. TIFF files, which are normally uncompressed, are roughly three times the resolution of the camera's sensor in size (e.1000. around 30MB for a TIFF file from a x-megapixel camera).
How Much Video Can You Shop?
When memory cards are used for storing video clips, capacities are measured in time, rather than number of epitome files. The compression ratio applied by the camera will dictate the size of the video files. About camera manufacturers put a limit of 4GB on video chapters – or upwards to ane hour of video recording. The table beneath shows typical video recording times for 3 different video formats with three card capacities.
| 1GB | 2GB | 4GB | |
| MPEG4 | ii min 33 sec | 4 min 68 sec | 9 min 38 sec |
| Motion JPEG/ stereo WAV (VGA@ 30fps) | three min 49 sec | 6 min 59 sec | 13 min 58 sec |
| AVI (VGA@ 30fps) | 7 min 31 sec | 15 min 19 sec | 30 min 36 sec |
Factors Affecting Card Capacity
The bodily capacity of a memory card tin depend on several factors:
1. How the computer operating system sees information technology. Most operating systems define a megabyte as 1,024KB (1.024MB), which means a 1GB card'southward capacity is 1,048.576MB.
2. How the carte manufacturer defines a megabyte. For many manufacturers (and most disk drives), a megabyte is exactly one million bytes.
3. How formatting the menu changes its capacity. This varies, but typically around 1% of total capacity is allocated to a 'security area'.
The last two factors together explain why the actual capacity of most memory cards is slightly lower than it might appear.
How Much Memory Do You lot Demand?
Assuming you lot e'er shoot with your camera'south highest resolution and quality settings, information technology'south piece of cake to calculate the size of the retentiveness bill of fare you require. Back in the days of movie, about amateur photographers would shoot up to two 36-exposure films in whatsoever ane day; the equivalent of 72-75 shots. With digital, we're less conservative, so a better estimate for a day's 'normal' shooting would be 100-150 shots. In photographically exciting places, this figure could safely be doubled – and if y'all programme to shoot video also every bit stills, yous will demand at least four times more retentivity capacity.
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CompactFlash cards are available in capacities up to 8GB.
When you're travelling, we recommend allocating at least 2GB per twenty-four hour period if you travel with a laptop reckoner or portable storage device and can download each day's shots in your hotel each dark. A full of 3 1GB cards will provide for 1 'emergency' spare that can be used when you need more capacity. Cards are calorie-free and accept upwards very trivial space in your camera bag. It'due south ameliorate to have several spares than to exist forced to shoot at lower resolution and compromise your ability to make large prints.
Travellers without laptops or portable storage should have at least 4GB of retentiveness card chapters with them and permit a minimum of 2GB per day when they volition be in transit and unable to transfer their shots to optical disks. Yous should be able to observe services that volition transfer images from a memory card to a CD or DVD in most population centres. We recommend purchasing two copies of each disk: one to keep with you and the other to send home every bit a back-up (in case the other disk is lost or damaged).
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Accept at least ii 1GB cards when setting out for a day's photography.
Do You Need a Loftier-Speed Card?
CompactFlash and SD cards are supplied with a range of speed ratings, typically 40x, 80x and 144x (where ten represents a transfer speed of 150 kilobytes per second). These speed ratings can exist useful for photographers equally they can assistance you lot to choose a card which matches your camera's data transfer speed.
Memory menu manufacturers accuse premium prices for their high-speed cards only, for photographers who shoot with digicams, fast cards will be of lilliputian do good. Even many DSLR photographers will find standard 40x speed cards will be adequate for most shooting situations. However, they will brand a divergence in how long it takes to download files to a estimator, particularly if you have a fast PC.
High speed cards are also worthwhile for video recording, specially if your camera or camcorder supports the new, ultra-fast UDMA technology (which will be supported in the next generation of DSLR cameras). However, you need a UDMA-enabled reader to benefit from the speed advantages this engineering science offers when downloading large files to a reckoner.
The primary determinant of retention carte speed is how the controller in the card exchanges information with the photographic camera. This can vary by as much as 3-4 megabytes/second from one camera to another. The flash memory itself likewise determines the maximum speed of different cards and accounts for a sizeable office of the cost premium charged for fast memory cards.
Is information technology worth paying more for a high-speed card? It is if your camera can friction match the card'south data transfer speed and if yous use burst mode frequently. If you take shots 1 at a fourth dimension, the speed of the bill of fare is irrelevant.
High-speed cards may also exist worthwhile if the camera is unable to shoot and write simultaneously, or if your camera's innate write speed is slow and its buffer retentivity is small. Otherwise, y'all may not notice much difference betwixt a high-speed card and a standard one.
Memory Card Tips
Beware of apocryphal cards that appear to be from a leading manufacturer but lack the warranties of the genuine products. Replicated cards with labelling and packaging that resembles cards from leading brands are readily bachelor on the internet. Check carte labels very advisedly and only purchase from reputable re-sellers. If the deal seems too practiced to be true it probably is.
Care for memory cards with intendance. Go on them in dust- and water-proof cases while they are not in employ. Always behave at to the lowest degree one back-up card in case you run out of retentivity on a shoot.
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Moving the lock on the side of an SD card down protects all the files it contains against erasure. To delete the files or format the card yous simply return the lock lever to its up position.
Don't open the camera's card compartment while the files are existence written; information technology will virtually certainly cause shots to exist lost. Shots may also be lost if the bombardment fails while files are being written. In about cases these 'lost' images tin be recovered with file recovery software (which is supplied with some high-speed, loftier-capacity cards). Many photographic camera shops provide a file recovery service for a minor fee.
Always format each card in your camera before you utilize information technology, making certain you have transferred the images information technology contained to an archive binder. Some digital cameras can't operate with cards that were formatted in a calculator or a different photographic camera.
Don't expect a photographic camera to display images captured on a card past a different camera – even if it comes from the same manufacturer.
Write Protection
Secure Digital (SD) cards have a congenital-in facility that allows yous to lock files stored on them so they cannot be deleted. This is useful when you are using several cards over a period of time and don't have facilities for downloading the shots. A sliding lever on the left side of the card locks in this write protection. When it is pushed down towards the lower edge of the card, all data on the card is protected. Pushing it up towards the meridian of the bill of fare removes the write protection and allows paradigm files to be deleted individually or collectively. The card can also be formatted.
For other memory cards, write protection tin be applied through your camera's play or set up-up menu (indicated by a tools icon). The function is usually indicated by a horizontal central icon. The aforementioned bill of fare is used to remove write protection.
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Source: https://www.photoreview.com.au/tips/buying/how-much-memory-do-you-require/
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