The Canon Speedlite 270EX is a compact hot shoe flash that is an excellent accessory for modern Canon DSLRs and G series compacts. For this review I've tested the 270EX on a Rebel T1i and G9. Owners of older DSLRs, such as the Canon XT have reported that the flash works, but you can't change some settings, such as switching from 1st curtain to 2nd curtain.
Menu Controls on T1i and G9
The story is much more interesting with the Canon Digital Rebel T1i. Mount the 270EX in the hot shoe then go to the Flash Control menu, and you have a variety options including E-TTL II or Manual exposure (1/64 to 1/1), Shutter Sync (1st Curtain, 2nd Curtain, or Hi-speed), Flash Exposure Compensation (-2 to +2), and E-TTL II Metering Pattern (Evaluative or Average). You also have access to two Custom Function settings: Auto Power (on or off) and Quickflash with continuous shot (on or off).
Both photos unedited. Top image captured with 270EX flash in bounce position on a Canon Rebel T1i. Bottom image captured with flash in same position on a Canon G9. The T1i renders a cleaner image with the flash. Click to enlarge. Photos by Derrick Story.
You have many options on the G9 too, even though it's an older camera. There's quick access to Flash Exposure Compensation (-3 to +3) via the Function button. If you open External Flash Settings on the Menu, you have Flash Mode (Auto or Manual 1/64 to 1/1), Shutter Sync (1st Curtain, 2nd Curtain, or Hi-speed), Slow Synchro option, and Safety FE option. The flash responds well to these settings.
The bottom foot of the flash (that slides into the hot shoe) is well-constructed using a metal plate instead of a plastic fitting that we normally see. The flash head pulls forward to "Tele" position for focal lengths 50mm and longer. It also swivels upward at 60, 75, and 90 degrees. I love this feature and consider it a real bonus on such a compact flash. Another improvement that Canon had made over the 220EX is requiring fewer AA batteries from four to only two for the 270EX. And it still has plenty of pop with a guide number of 72 ft. at ISO 100 (28mm focal length). Since most of the settings are controlled via the camera menu, there are only two buttons on the flash itself: the on/off switch and the hot shoe lock lever.
The 270EX uses an intermittent flash firing system for autofocusing assist and exposure evaluation, regardless of the head position. This system worked fine on the T1i, but it isn't supported on the G9. As for the exposures themselves, I rate the 270EX as excellent on newer cameras. I'm especially impressed with the bounce flash exposures on the T1i. The E-TTL II system in Evaluative mode does a great job of rendering flattering exposures. The results weren't quite as good on the G9, which I attribute to older flash metering technology in the camera. The pictures were still quite good, but not the same amazing quality I saw on the Rebel T1i. (See photo examples for comparison.)
The Canon 270EX is selling on the street for about $150 US. That's not cheap by any means, but reasonable compared to other Canon flashes such at the 430EX II at $264 or the 580EX II at $400. The 270EX fits in your pocket (or the palm of your hand) and is an excellent match for newer Canon DSLRs (40D on up) and is serviceable on many older Canon cameras such as the G9. The swivel head is the killer feature that really sold me on this accessory.