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1. Unable to read memory card slot 1 a7iii full#
2. Unable to read memory card slot 1 a7iii iso#
3. Unable to read memory card slot 1 a7iii plus#

So if you shoot like this often you can save money by using UHS-I cards in slot 1. With this setup the write speed is restricted to the maximum write speed of the UHS-I card in slot 2. If you want to record simultaneously to both slots 1 and 2 at the same time then there is no benefit to using a UHS-II memory card in slot 1. I calculate the average in-camera write speed by taking the number of uncompressed raw shots, multiplying this by the file size (49.3MB) then dividing by the total time taken to shoot and clear the buffer. I do this test shooting uncompressed raw, compressed raw, extra fine jpegs and raw + extra fine jpegs. The faster the memory card the more shots you will be able to take before filling the buffer, this is because files are also being written to the SD card whilst shooting thus clearing the buffer for more shots. This will give me the number of shots taken before filling the buffer, the average time taken to clear the buffer and the average total time from start to finish. I then average the buffer clearing time and total time of these 3 results. I repeat this test until I get 3 results with the identical number of shots taken. I also time how long it takes for the buffer to clear.

Unable to read memory card slot 1 a7iii full#

I then press the shutter button and time how long it takes before the buffer is full (when the LCD goes blank and shooting slows). I fire off a burst of shots before starting the test because for some reason the first write is often much slower than subsequent writes for many of the cards.

Unable to read memory card slot 1 a7iii iso#

I use my Sony FE 24mm F1.4 GM lens, manually focus on my target ( 1/1000th Sports Photography of Bob Martin), set the aperture to f/1.4, shutter minimum of 1/100, ISO to 100 and Drive Mode to Hi+ for the maximum frames per second. The tests that I perform to work out the fastest memory cards for the a7III are fairly straight forward. However, the Sony SF-G None Tough cards (now obsolete) which have identical write speeds on the label are achieving 147.53MB/s, so I think there is still something wrong and the SanDisk cards are outperforming them because of this. With the release of firmware version 4.00 I decided to retest them and now they are now managing 132.50MB/s shooting uncompressed RAW, so Sony has definitely tweaked something. I did report this to Sony but didn’t receive any feedback. Important note: When I tested these cards with firmware version 3.10 they were only managing 107.27MB/s when shooting uncompressed RAW, but JPEG speeds were as they should be. Here are my in-camera speed test results using a 64GB card: Image TypeĬompressed RAW (25MB) + JPEG Extra Fine (18.3MB) Shooting uncompressed RAW these cards actually have an in-camera write speed of around 132.50MB/s.

Note: Sometimes these cards can be a little tight in the memory card slot compared to standard SD cards.

The Sony SF-G Tough cards are rated V90 for video and have a claimed read speed of 300MB/s and a write speed of 299MB/s. The cards feature a one-piece ribless structure and don’t have the common lock switch, they are also X-ray proof, magnet proof, anti-static and temperature proof. Tough memory cards are 18 times stronger than standard SD cards, bend proof to 180N, drop-proof to 5 meters, waterproof to a depth of 5 meters for up to 72 hours (IPX8 rating) and dustproof with an IP6X rating. If you find this article helpful then you may also like my Sony A7 III Accessories Guide and Lenses Guide. These tests were done using my Sony a7 III and 64GB SDXC UHS-I memory cards. * Shooting Uncompressed RAW Best UHS-I Memory Cards These tests were done using my Sony a7 III and 64GB SDXC UHS-II memory cards. If you scroll down a little further you will find my complete speed and buffer test results for each card. Here are my in-camera card speed comparison results for all of the UHS-II and UHS-I CD cards that I’ve tested so far in my Sony a7 III.

Delkin Devices 64GB POWER UHS-II SDXC (300/250)

Unable to read memory card slot 1 a7iii plus#

Kingston Canvas React Plus UHS-II SDXC Memory Card (300/260) UHS-II Memory Card Speed & Buffer Tests + −.