 Alex Cabrall |
Canon T90 and 420EX While the instruction manual for my 420EX didn't mention the T90 once, Canon's online description includes the T90 is the list of cameras "compatible with TTL flash mode". HOWEVER, when I stick the 420EX on my T90, all I see in the viewfinder is the Green Flash Ready light, 1/90 and F/1.8(blinking slowly), in EVERY single mode and EVERY single combination. Before loading film, I changed the ISO on the camera to both extremes, firing the flash at both ends, and noticed the flash changed its output. I then loaded the camera with ISO 100 (all I had), set the camera to Program(Which I HATE), and went out and shot 4 photos with flash, one without. 1: Is that all the viewfinder info I get? 2: The "correct exposure" light illuminated on those 4 shots, even though the "zoom head reading" was at 35mm and my lens was a 50mm. Am I getting properly exposed photographs, or should I finish the roll with no-flash shots and wait for my Elan? -Thanks for any help.
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Jon Close |
Ignore if you already have it - the user manual for the T90 and other manual focus Canons is available online at http://www.canonfd.com/choose.htm. More useful information is available at http://www.mir.com.my/rb/photography/companies/canon/fdresources/SLRs/index.htm. The T90 was the first (and only) manual focus Canon with TTL flash metering. While there are functional differences in A-TTL between the T90/300TL v. the later EOS cameras and EZ speedlights, standard TTL I believe is compatible throughout the TL/E/EG/EZ/EX series speedlights. The easiest question to address is the speedlight's zoom setting compared to the lens. There is no communication of the lens focal length between the FL/FD lenses and the camera, so the speedlight cannot automatically zoom. Without that communication, the 420EX is probably defaulting to its widest setting. When using a Canon flash, the T90 will automatically set the shutter speed to 1/90 in full Program and Aperture-priority modes. In Shutter-priority and Manual modes the shutter can be set at any speed up to the 1/250 x-sync. I could be wrong, but I think the T90's display is similar to the EOS cameras. When using a TTL flash in full Program, the meter shows "correct" exposure - the flash is the main light and background exposure with ambient light is ignored. Aperture-priority, Shutter-priority, and Manual modes are automatic fill-flash modes and the meter measures the ambient light. That could be why you got the flashing f/1.8 when checking it in relatively dim indoors.
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Alex Cabrall |
Thank you for your responce, Jon. I finished off my roll, and got it developed at a photo lab. Here's what I've found, for anyone searching the forums: 1: there seems to be absolutly no way to get the viewfinder to tell you ANYTHING other than 1/90, flash ready, and a blinking f/1.8 . HOWEVER.... 2: The shots came out AMAZING. I even used bounce flash, and every single one had wonderful, even, proper lighting. (I used full-bloody auto Program, but hey, I got the shot.) Now that I have my Elan 7n, I'll use that so I can have control over exposure. However, if anyone out there tries what I did, this should help.
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