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24 of 24 people found the following review helpful
on January 20, 2014
This is a very good performing, well constructed flash for it's price point. I purchased the 90ex to be a master to my 430EXII Speed light on my 6d and 5d Classic. It functions very well as a wireless ETTL trigger on my EOS 6d, but is a, "No go," on the much older EOS 5d mark1. Although the 5dc does have ETTL and ETTL II, it does not have a set up menu for wireless setup. So, you might want to keep that in mind if you have an older EOS. It does function on the 5d classic, but only flash exposure, flash zoom and flash intensity can be controlled due to lack of a menu on this flash and lack of one on the 5d 1, also AF focus assist, does not work with the 5d I. All of these functions are accessible on the 5d II and 60d or newer EOS's and of course, the eos M.

This flash is very effective within 15ft. And with the addition of a diffuser ( not included ) the results are very nice. The 90ex is a great buy because it is both a pretty good flash, as well as a master trigger in a wireless system for newer eos cameras, two things that you would need to spend far more on to achieve. I highly recommend you purchase a diffuser along with this flash, because as with other flashes, the resulting images are far more improved. This would make a great back up for a pro doing portraits away from home/studio or as a first time flash user, or anyone just shooting at closer ranges that wants something a tenth the size of their regular flash. Oh, I forgot to mention, with NMH AAA batteries this flashe's recycling time is blazing and seems to flash forever!
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6 of 6 people found the following review helpful
The 90EX was designed for the EOS M kit, but works on any E-TTL capable camera. I bought the 90EX to serve as the missing "popup" for my 6D and trigger off-shoe E-TTL Speedlites.

The Guide Number of 30 ft/9m at ISO 100 means the 90EX has power output similar to a popup flash. So what's the 90EX good for? As a flash, it works great for close fill-in flash, snapshots or macro when used on an off-shoe cord. It is not not powerful enough for group shots. With Sanyo Eneloop AAA batteries, recycle is about 2 seconds at full power. I haven't tried alkaline batteries but reviewers report alkaline recycling takes twice as long as rechargeable batteries.

The unique feature of the 90EX is the wireless E-TTL master function: triggers slaves with auto or manual modes controlled from the camera flash menu. In this regard it's better than the dedicated ST-E2 master: brighter and more reliable trigger, controls 3 slave groups rather than only two and is useful as a flash when not performing master duties. The 90EX uses light pulses to trigger so line of sight to slaves is required. Swivel the slave body so the sensor faces towards the 90EX. Reflective surfaces indoors (e.g., white walls) will often carry the trigger pulse even if faced the wrong way. However, outdoors they will not trigger without direct line-of-sight.

Other than an on-off switch, there are no external controls. To set options, use the flash menu on 2007 and newer EOS cameras. On my 6D, everything is operational except for FEB and high speed sync. However, high speed sync is available in master mode (trigger mode). Flash exposure compensation can be set with external camera controls, the QCS or flash menu.

What I like best about the 90EX is it's so small and light I can keep it in my bag all the time. My larger Speedlite gets left behind if I'm not positive I need it. All in all a wonderful petite flash for snapshots, close fill and as an E-TTL controller.
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4 of 4 people found the following review helpful
on November 12, 2014
This flash was made primarily for use with the EOS M as the body does not have provision for a flash (but it does have a fully capable hot-shoe). With a guide number of 9 (meters, 27 feet), this flash is actually a bit less powerful than the pop-up flashes on the Rebel DSLRs (whose guide number is 13). However it is only a little larger than a matchbox and easily fits into a pocket.

It runs on 2 AAA batteries, which will only last for a few dozen shots, so it would be wise to pack additional batteries. On the plus side, the flash with batteries only weigh a couple ounces, so it won't weigh you or the camera down.

This camera will also serve as a cheap wireless controller for other Speedlites, enhancing its usefulness.

The original list price for this flash was $149, which is silly considering the much more powerful 270ex II only lists for $20 more. However, it can be had for under $50 online (including a white box version here on Amazon).

There are no external controls on this flash, so any adjustments will have to be made from the camera.

Bottom line: If you own an EOS-M, consider this essential equipment. Otherwise, consider it to be a wireless controller that can also act as a pop-up type flash.
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9 of 11 people found the following review helpful
on December 23, 2013
I got this for indoor shots for my Canon 5D Mark II which does not have an on board pop up flash like most DSLR's. And, that is exactly what the 90EX is. It is very small and not powerful. But, it is good for short distance flash up to around 8-10 feet. Be sure to pay attention to shutter and aperture to ensure that backgrounds are also exposed as this little flash cannot do it on its own. The 90EX serves its purpose but don't expect this to be anything near the power of Canon's more expensive flash units.
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4 of 4 people found the following review helpful
on October 30, 2014
Amazingly small and high quality flash and it's light output is as I might expect BUT it does not work in High Speed Sync mode! This has made it of very limited use for me since I wanted to use it as fill flash with my 5D3. I wish this had been stated before I bought it.
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5 of 6 people found the following review helpful
on March 26, 2014
Nice tiny flash, but it isn't very powerful. If you need a tiny flash, it does what it is supposed to do. The fact that it can act as a wireless transmitter for other flashes is nice, making it a possible replacement for the ST-E2.

The price of this flash compared to the 270EX II or models from other manufacturers makes it a difficult recommendation for most shooters, though. It isn't noticeably more powerful than the popup flash, basically making it next to useless for Rebel or xxD body owners unless they are just looking for a wireless transmitter and their current body doesn't have that feature built-in.
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3 of 3 people found the following review helpful
on March 15, 2014
It is unbelievable that Canon has the top models with no pop-up flash. It helps a lot when you need just a little extra light, a fill-in flash or as master flash.
It is light, very little, you can carry it even in your pocket. It has no controls at all, you have to control it through your camera. It is not as powerfull as a pop-upflash but it is enough for me. It work with 2 AAA batteries.
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3 of 3 people found the following review helpful
on February 10, 2014
This is a great little flash. Granted it does not have the output of the larger Canon flashes, but it takes up little room in my bag and is a great addition when I need more than just available light or some fill.
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1 of 1 people found the following review helpful
on September 1, 2014
I'm using this on a 5D Mark II and it provides me two primary benefits: (1) as a small and light travel flash for fill flash situations; (2) as a master flash for a bunch of cheaper 3rd party E-TTL units (particularly, a Yongnuo YN510EX and coming soon a Pixel Mago).

I wanted to try off-camera E-TTL for a small home studio, and didn't want to deal with monolites and cables, so I thought this would be the best solution.

So far, it is able to control the YN510EX quite well. I had originally planned to get a bunch of the Yongnuo E-TTL slave flashes, but then I saw the Pixel Mago and thought I'd give that a try first.

Bottom line, if you have a 5D series, and might have the occasional need for a fill flash this unit is a good buy. Also, if you're looking for an E-TTL master flash, you might want to consider this over the ST-E2 unless you need the range. If you need the range anyway, you'd probably be better off with one of the radio trigger systems.

Edit: just compared this to the Pixel Mago in master mode. The 90ex can fire a slave that's behind the camera, whereas the Mago wasn't able to fire the same unit without some adjustment. It seems that this fires the command pulses much better than the Mago. Don't know how other master flashes would fare in this test, but I'm quite happy to use this little flash as my master in a small studio setting.
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2 of 2 people found the following review helpful
on February 26, 2014
Good enough for the price, and works well with the camera, but I prefer my larger speed lights - even on the EOS M body. Still, worth the money when you want to travel without all the kit.
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