The Canon EOS 40D has a single card slot and supports CompactFlash memory cards with a maximum storage capacity of 128GB. The camera is UDMA compliant and accepts Type I or II CF memory cards.
When comparing CF cards for the Canon 40D, the read speed is the primary factor to consider. When transferring a lot of photographs, for instance, the quickest CF memory cards will beat slower cards by minutes.
1. Lexar Professional 1066x 32GB CompactFlash Card
The Professional 1066x CompactFlash card line from Lexar, which is now their highest-performing CF line, has added to their collection of CompactFlash devices. The 1066x line is intended for amateur or professional photographers and videographers and has read transfer speeds of 160MB/s (vs. 120MB/s in their next-fastest line). To record contemporary video formats (1080p, 3D, and 4K) across a variety of top-tier as well as entry-level hosts, these cards can be inserted into HD camcorders, 3D cameras, or DSLR cameras.
The 1066x line meets with VPG-65 requirements and makes use of UDMA 7 technology. The cards’ efficiency in post-production is increased by the speedy card-to-computer transfers they can perform when paired with a card reader that supports UDMA 7. You can download Image Rescue for free to help with photo and video file recovery in the event of card corruption or unintentional deletion.
- Transfer speeds up to 160MB/s.
- Video Performance Guarantee sepc VPG 65.
- Limited lifetime warranty.
2. SanDisk Extreme 32GB Compact Flash Card
The SanDisk Extreme CompactFlash Memory Card is ideal for use with mid-range to high-end DSLR cameras and HD camcorders and has exceptional read/write rates to capture speedy action photos and for swift file transfers.
With its Video Performance Guarantee (VPG-20) technology, this memory card can record Full HD video (1080p)4 at a minimum sustained data rate of 20MB/s3. Use the card’s write rates of up to 85MB/s1 (567X) for burst photography, and its transfer speeds of up to 120MB/s2 for productive workflow.
This memory card has storage capacity of up to 128GB5, which is more than enough for Full HD films and RAW images.
- Read speeds up to 120MB/s.
- Write speeds up to 85MB/s.
- Sustained data recording of 20MB/s.
- Water, x-ray, & shockproof.
3. SanDisk Ultra 16GB CompactFlash Card
The 16GB Ultra CompactFlash Memory Card from SanDisk has a storage capacity of 16GB, allowing you to save thousands of high-resolution photographs in formats including RAW and JPEG as well as hours of 1080p HD video. Quickly transfer data to and from your computer with data read speeds up to 50 MB/s and slightly slower data write capabilities with this CompactFlash card, which supports improved shot speeds.
Super-fast speeds you can rely on
Save time moving files to your computer with transfer speeds of up to 50 MB/s and capture the moment with lightning-fast shot speeds. You can trust SanDisk Ultra CompactFlash memory cards to take and keep your favorite photos and movies because of its durability and high performance.
Outstanding Full HD Recording
The SanDisk Ultra CompactFlash Memory Card guarantees fluid video capture with Full HD video (1080p) camcorders thanks to faster transfer rates. The card can handle the Full HD video formats’ demanding memory requirements.
- Speeds up to 50MB/s.
- Excellent reliability and value.
- Ideal for mid-range DSLRs.
4. CompactFlash Delkin Devices 64 GB Prime UDMA7
The full HD video shooter or someone who takes measured bursts of full-resolution continuous RAW frames has been kept in mind when Delkin Devices created this Prime CompactFlash card. The available CompactFlash cards are not the fastest. This card is not the worst you could get, even though there are cards listed here that are better. In fact, far from it.
The highest read and write speeds for this specific card are each 160 MB/s. For recording full HD video and continuous RAW frames, this card is adequate. However, it is not ideal for recording 4K footage.