If you own the digital camera, for you, most likely, very data carrier choice topical issue. And why it is necessary and why it is so important?
The digital device, unlike film, needs available a data carrier, i.e. the device where will register and where files will be stored. As you guessed, these files and are pictures (shots). It is natural that number of the written-down files, we read – shots, will depend directly on characteristics of the carrier.
And it is accepted to call data carriers for photoequipment memory cards. As a matter of fact this same that the winchester (hard drive) in the computer.
And how it everything works?
Very simply! The memory card is formatted, as well as the specified winchester, but it is always formatted under file FAT32 system.
When shooting the camera will transform the optical image to a digital form, squeezes it up to the certain size, forms the photofile in the JPEG (name.jpg) format and writes down it on the specified carrier. Within this article we are excited a little by the first action (analog-digital transformation), and here the rest should take an interest.
After the digital form was received, formation of the file begins. Some devices allow to write down uncompressed files in the specific RAW format (will tell about this InfoAdvisor.net in the following article about ). But it is done, as a rule, by "big" devices since thus high efficiency is necessary. Besides, so high capacity of the carrier will be required. Sense of an uncompressed photo is the highest quality and a claim for copyright.
Compression of information with formation of the file of the JPEG format more habitual to all is in most cases made. Here it is more interesting. Depends on extent of compression not only quality, but also "weight" of the received file. Thus, at manipulations with number of megapixels can change not only number of the involved matrix elements (change of scale), but also extent of compression of information. In some models of devices there is a possibility of a choice of the mode: "FINE" (best) and "STANDARD" (usual), and also in these or those variations, but the same sense. Here at the same number of megapixels, say, seven, extent of compression changes. It is clear that the file in the FINE mode will be more. Respectively, the more compression (compression), the file , but also quality is worse.
And than excessive compression threatens? At compression of the photofile the part of information simply jumps out (at first of places with the smallest gradient of color), thus study of details in a picture worsens, there are artifacts (noise) in the form of chaotic color points, and also there is a pixelization of the image, i.e. integration of the size of pixels (small squares).
For example, if there was here such invoice formed by four pixels 1 … 4:
… that at compression pixels 2 and 3 "were rejected" and it turned out here that:
Actually they, of course, are not rejected, and unite. I.e. the pixel 2 becomes identical with 1, and 3 – with 4.
And here so it looks in a natural photo.
As you understood, the first photo with small extent of compression and high quality of the image, and the second – on the contrary.
Here we also approached closely the first, and it is possible to tell, to the key parameter of memory cards – capacities.
Memory card capacity
Capacity is understood, of course, as amount of information which can be located on the card. The most widespread: 128, 256, 512 Mb and 1, 2, 4, 8 Gb. However, 128 and 256 Mb already become obsolete, and demand for them decreases.
At once we will make a reservation that for active shooting you will be suitable cards, since 512 Mb and more. Because at smaller capacity the quantity of pictures will be very poor that you "will simply tie" to the computer since it will be necessary "to throw off" files often. Naturally, the built-in memory (if it is) will be enough for you for 16, 32 or 64 Mb unless for technical shooting with very small permission.
At a choice of capacity of a memory card of InfoAdvisor.net advises you to be guided by quantity of money and rationality. If you saved and bought strongly small card, most likely, it will be inconvenient to you to use it that will compel to buy as a result one more, and it not economy any more.
And, on the contrary, if you with the last bit of strength bought the card with an enviable stock, to you, of course, before exhaustion of its resource another is not required any more. But whether all its opportunities completely or at least on a half – not the fact here will be used. And can happen so that the resource will come to an end, and you for all history of this card used only 10 … 30% of its capacity.
The matter is that within shooting a number of files with a name in the form of an index of model of the device and number in the order of, for example, DSC03197.JPG is formed. Having finished shooting material, say, in a tour, you are eager "to dump" it on the personal computer. And, as a rule, do it as soon as get access to the computer. Further storage of files on a memory card loses sense. Also I will tell more, it is better to clear the card after copying since at the subsequent shooting not on the empty card new files will be added to the old. It can lead to duplication of files at the subsequent copyings on the personal computer. And search of new files against the old – a thing not from pleasant. Present as you will be engaged in it if there some thousands of files.
In most cases as optimum capacity for occupation by the photo it is possible to consider capacity: 512 Mb or 1, 2 Gb. However, if you plan to remove and videos (in the presence of such opportunity in the camera), you will already need at least 4 Gb, and at occupation to these closely and all 8 Gb.
Approximate quantity of the shots which are located on memory cards of various capacity at various permission you can determine by the table approximately. The top line – the Fine mode, lower – "Standard".
The table is provided for the Memory Stick cards and the device SONY DSC-R1 therefore values for other types can differ.
Speed of reading and record on the card
Speed of operation of the card is important only in case you plan to be engaged in the photo professionally and on the corresponding equipment. Otherwise it is not obligatory to chase high-speed stores at all.
And actually, speeds of work of memory cards differ not only depending on their type, but also a design within one type. And how speed influences, is more exact on what? Elementary! The quicker the file will be written down, the quicker the camera will be ready to the following picture. Here you and an explanation why for professional application high-speed carriers are necessary – there should remove quickly. Whereas at usual shooting of it it is not required. And in "soap trays" the speed of operation of the device leaves much to be desired therefore in that case to use high-speed carriers absolutely senselessly. Therefore, why to pay more? The cost of memory cards increases in proportion to their speed.
Speed is, as a rule, specified on cards, for example, 266kh, in prices you can also see this parameter in units measured in Mbps. The more the number, the is higher speed. But once again I will repeat, senseless occupation – to try to overtake the camera. Now among memory cards does not meet obvious "slow movers" any more, and available on sale quite are suitable for the vast majority of cases.
And here the following question much more interesting since everything depends on it.
Types of memory cards
There can quite be such situation that you, having bought a memory card, then with horror will understand that it does not approach your device. And why so can happen? But because there are various and not interchangeable types of cards.
Such maps are most distributed:
- SD, are applied in the majority of "soap trays";
- Compact Flash (CF) or as they are called still, Microdrive;
- Memory Stick (MS) and their variations which are the SONY trademark and are, as a rule, used in similar devices, etc. And kinds of Memory Stick are interchanged and demand only use of the adapter (purely mechanical).
In order that there was above no the specified situation, it is necessary to be engaged in reading, but not fiction, but the maintenance instruction of your camera. There you will also find an irrefragable answer on so simple, but responsible question.
By the way, I do not exclude such case that you should not go at all to shop because at you did not consider such feature and got model only with the built-in memory. Then all provided information you, leaves, read in vain. Memory cards are not necessary to you!
But also other options meet. In devices "is more senior" absolutely there is no built-in memory, but there is a possibility of installation at once of several cards, as a rule, two.
And here is more attentive – these memory cards not always than one type! The Raznotipnost of use of cards is only at first sight inconvenient. And actually it is very convenient and practical option since for any of several reasons it can not appear on sale of one of types, but there will be another. And you will be able to equip the device with memory. Whereas in case they are same or the device only with one carrier, you will remain with anything.
In devices with possibility of installation of several cards there is a switch of these cards, and it is possible to shoot in unit of time only with one card. But it is not terrible since when the capacity of one will end, you switch to another. By the way, devices support "hot" switching, i.e. without switching off of the camera.
Again InfoAdvisor.net advises, as well as earlier in article about , to take with itself the camera. You will avoid many problems. First, you precisely define at once, whether the card approaches. Secondly, you immediately estimate its working capacity.
Also we will talk about it.
Purchase and verification of the map
At once a couple of words about manufacturing firms.
As a matter of fact any memory card is an expendable material, and the firm is not so important here. It is possible to choose any of available on sale and attracted according to characteristics and the price. However it is necessary to avoid fakes. Therefore, it is better to buy in the checked shops, and it is again better specialized. Maps of firms are most distributed: Transcend (it is the most optimum option, I consider, on quality and the price); Kingston; Samsung, etc. Besides, manufacturing firms use the cards of the same name, for example, of Canon; SONY. For example, the SD cards with the Canon logo can be replaced safely above with the specified analogs. Whereas the SONY firm releases the Memory Stick cards and it is not desirable to replace them with analogs since they are executed on specific technology. Therefore, buying analog it is necessary to be ready to "surprises": or in the form of not really high technical quality (including instability of parameters), or extreme sluggishness of the card.
Here you also decided on a choice and already paid purchase. I will not be tired to repeat – demand the check and the copy of the check! Then at once ask the seller to show the card. It has to be sealed in the blister. Now about, why quite so and exactly at once. And to define integrity of packing. Packing whole – the card was not used. Cases when upon purchase of memory cards those worked with already opened packings met, but refused to be formatted in the device. Here or this card already accepted and repaired on a guarantee, or used it, and it is very incorrect. Why to you excess problems? It is better to know that a memory card not worn.
Then open packing and take the card, it is more exact let the seller does. Examine it. All inscriptions on it and on the instruction to it enclosed have to be accurate. After that it is possible to start "test drive". And what it means?
Install a memory card in the camera. Thus do not forget – the device has to be obligatory for the switched off! Then format the card since they go the unformatted. Further try to finish shooting some shots at various permission and see the received material. Erase (remove) all received shots on one. Format the card.
If all these actions worked well for you, can quietly go for shooting. At emergence of difficulties it is better to exchange the card at once.
Rules of the handling of cards
Their operation also depends on type of cards.
For example, CF memory cards are constructed on the basis of the tiny winchester with the rotating disks and moving heads for reading and a data recording. Therefore called them Microdrive.
This design cannot work at low temperatures. Their range is from +5 to +40 °C. Feature of the CF cards is not really high speed (however it higher, than at SD), but possibility of storage enough large volumes of information.
SD and MS memory cards are executed on the basis of flash drives and have no moving details.
Can be used at temperatures from minus 5 °C, but the maximum capacity is, as a rule, limited 8 Gb. But progress we will not beg and, it is quite possible that flash cards will overtake and in this parameter soon.
The SD cards are the most sluggish. If to look on a resource, the smallest, of course, at CF since there are rotating details.
And in conclusion of InfoAdvisor.net will provide some general rules of the handling of cards:
- never insert / do not take the card at the switched-on camera. Thus it is not obligatory to take batteries (batteries or the accumulator) at all.
- at these actions do not try to do something violently. If the card is not inserted, it is quite possible that you simply incorrectly insert it (it can be inserted only one party), or there was a distortion. Look on a compartment lid under cards, the pictogram as it is correct to insert the card is, as a rule, put there.
- at extraction of the card be not zealous and do not pull for it that is forces. As a rule, is available or the button, when pressing on which card moves forward (jumps out), or it is necessary to press the card at first (to drown), and then to release (thus there is an effect of the button – it clicks and jumps out).
- do not make the above actions strongly often since contacts wear out. To replace the card not the problem, and here with the camera is worse, more exact more expensively.
- do not subject a memory card to strong blows and influences of strong magnetic fields. The last is capable not only to put the card out of action, but also to deprive of you the finished shooting shots – they will simply be erased. Are most subject to it, i.e. are most vulnerable in this plan of the CF card.
- do not try to use the device if temperature is lower or higher than operational range for this or that type of cards. Do not confuse operational range to storage conditions. The first it is considerable already.
Carrying out these simple rules, you will long enjoy your camera, and will grieve nothing you at occupation by photocreativity.