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Sigma 2x EX DG APO Autofocus Teleconverter for Canon EOS
  • Owned For: 1 month to 1 year

5 out of 5 eggs WARNING ON AUTOFOCUS -READ SPECS 09/25/2011

This review is from: Sigma 2x EX DG APO Autofocus Teleconverter for Canon EOS

Pros: Read the specs..

I've had good Sigma gear and passable. Here's the deal. Read specs.
I've done well with this one, but I paid attention to the specs.
Canon tells you in specs that lenses won't autofocus at less than f/5.6. This lens with a 2x is never more than F/8, usually less. In good light with enough contrast, maybe. Learn to manually focus unless you've got a bundle of money for a really fast telephoto. To be reasonably sure of autofocuse, you need at least an f/2.8 to get f/5.6 with this.

Secondly, I once bought a Canon extender and learned that it didn't work except with Canon and only a few others. It's not unusual. This Sigma works with some, not all 3rd party brands. Canons with work with non-comparitble lenses, not necessarily true the other way. . TAlk to the dealer. It will avoid problems. I know how you feel. Call New Egg, but don'r complain because you guessed wrong.

Cons: None, except, see pros. Not a con per se, but the best of the extenders are aimed at specific lenses and their optical designs. There's nothing wrong with general telex tenders, but the more lenses they handle, the less they're designed for one lenses particular optics.

Other Thoughts: Users need to be responsible for what they buy. I have all but tossed out Sigma lenses, but others, not so. Pay attention to what you buy. Don't accept myth an don't assume too much. Saying something has AF doesn't mean it will AF with this or that -- or that it will work with all lenses.

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Mediasonic HFR2-SU3S2FW Raid 0 (Spanning) JBOD 
Raid 0 (Stripping) 
Raid 1 (Mirroring) 
Raid 3 (Stripped set with dedicated parity) 
Raid 5 (Striped set with distributed parity) 
Raid 10 (Mirroring + Striping) 4 3.5
  • Owned For: 1 month to 1 year

Pros: It's easy to set up and it's been no problem since installation other than drive going bad. I personally feel the need for Firewire and I can't speak to USB 3.0 because I don't have it. I have the USB 2.0 model, but appears to be no basic changes.

For Macs, the dual FW800 makes a daisy chain a snap. As it is, I use this in Raid 5 with 4 2TBs on my desk. It's just a whole lot faster than my NAS which serves a different purpose.

Cons: The new version is pricier, but not outrageous, and in any event I bought it on sale. Most of the build is solid, but I find the front door a little shoddy. Documentation, unless something has changed, is all but nil, but can be found on line at Mediasonic site.

READ FULL REVIEW
Mediasonic HFR2-S3B RAID 0 / 1 / 3 / 5 / 10 4 3.5
  • Verified Owner
  • Owned For: 1 week to 1 month

Pros: Cheap, Not Cheesy, 6 TB storage w/RAID 5, Outstanding connectivity for those needing Firewire 400 or 800, USB quick assembly, Quiet, easy fan replacement if needed. Very compact for Desktop.

Cons: Slightly cheesy front door mount, but it works well. E-SATA note specs requiring port multiplication(I don't). Documentation is a bit weak. Included are skimpy. YOU NEED TO USE WEBSITE. If you get a drive error indication, you did something wrong.

Other Thoughts: I needed bigstorage I could use on line with an iMac quad or plug into the MBPro laptop. The FW800 is perfect for that. If you don't need or want FW, pay attention, the same box is cheaper with few connects.

I filled the box with 4 Seagate 2TB Green drives, i.e. 5900 rpm. They run cool and quiet other than the fan occasionally waking up. They're plenty fast for this purpose.

FWIW, I've seen complaints on the 2TB limit, but my hugely more costly Thecus NAS has five 1 TB drives, the Thecus limit. It's a great NAS, but it cost a whole lot more, I need more room and the FW is faster than the net. I might consider another Mediasonics and jumper the FW if I need more.

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Joseph C.'s Profile

Display Name: Joseph C.

Date Joined: 10/23/05

  • Reviews: 10
  • Helpfulness: 8
  • First Review: 12/14/06
  • Last Review: 09/25/11
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