Forums > Photography Talk > Canon XTI issues with exposures.

Photographer

Paul Ferris

Posts: 3587

New York, New York, US

Hey all. I am wondering if anyone has had this problem. I have been shooting with my XTI for a few years now. Recently the last few times I have used my camera with flash I have noticed a lot of dark shots (too often for it to be a flash recycle time issue) Today at a shoot all of the photos that I took with it were dark. I tried to switch lenses and flash settings and also put it in automatic mode and it worked sporadically. Some of the photos were exposed properly and others shot seconds later at the same subject were totally dark. Does anyone have an idea what could be going on with the camera. I am planning on getting a new one but wouldn't mind keeping this one as a back up if it is fixable. Thanks.

Feb 03 13 12:00 am Link

Photographer

Ralph Easy

Posts: 6426

Sydney, New South Wales, Australia

One cause could be that the shutter and reflex mirror are about to go.

Or the diaphragm circuit is going nuts.

Error 99 might be incoming.

Better have a back up handy.

.

Feb 03 13 12:39 am Link

Photographer

Paul Ferris

Posts: 3587

New York, New York, US

Yeah. I was planning on getting a new camera soon anyway but I am hoping that it was something that could be repaired or maybe a quick fix (dirty connector). Oh well.

Feb 03 13 01:10 am Link

Photographer

WMcK

Posts: 5298

Glasgow, Scotland, United Kingdom

It could be your camera or flash. Try taking some shots with your built in flash. If you get dark ones there it is definitely the camera at fault. If not the fault could be in the flash, so borrow another and try it. If it is OK it's the flash at fault, if not, it's the camera.

Feb 03 13 03:39 am Link

Photographer

ontherocks

Posts: 22968

Salem, Oregon, US

i get that when i'm shooting too fast to let the flash fully recharge. some flashes will do a partial dump even if they aren't fully recharged. i use eneloop batteries.

also, e-ttl can be wildly uneven.

and make sure you aren't exceeding the sync speed on your flash. generally i can't go faster than 1/200s with mine.

with fresh batteries put the flash and camera in manual mode and then SLOWLY take a series of shots of the same thing. those should be fairly even. if not maybe something is wonky.

Feb 03 13 08:56 am Link

Photographer

David Nelson Photograph

Posts: 348

San Antonio, Texas, US

Lot of good advice in these posts, shooting with just the popup flash is a great starting point.  I am assuming you are shooting below sync speed.  Could very easily be that the contact points in the hot shoe are dirty or on the flash.

My first step would be to borrow a Canon flash from friend or a store and fire a couple of shots.  If shooting in ETTL it does tend to underexpose the images, but no significantly so, that its not an easy fix in LR

Feb 03 13 09:06 am Link

Photographer

Paul Ferris

Posts: 3587

New York, New York, US

Thanks for the help guys. The pop up flash works and I have had the problem using different flashes so I think that it must be something with the hot shoe. At least I have narrowed down the problem (and thank god it isn't my L Glass 24-70!) Thanks for the help.

Feb 03 13 10:08 am Link

Photographer

Leggy Mountbatten

Posts: 12562

Kansas City, Missouri, US

Do you have exposure compensation set for your flash? That would be the first thing I looked at.

Feb 03 13 10:48 am Link

Photographer

Light Writer

Posts: 18387

Oakland, California, US

Coincidentally, I was having a similar problem with my Canon yesterday.

I observed it mostly with portrait orientation. It wasn't a connection problem between the shoe and radio, it wasn't a battery issue, it wasn't a cycle time issue.

Never figured out exactly what it was. I did observe this at the END of the day, so maybe the camera was undergoing some sort of internal software memory leak, or firmware problem. Realizing the camera might need to be turned off and on and left to rest is a good excuse to buy another camera to use while the other one is resting. LOL

Feb 03 13 11:08 am Link

Photographer

Leggy Mountbatten

Posts: 12562

Kansas City, Missouri, US

Light Writer wrote:
Coincidentally, I was having a similar problem with my Canon yesterday.

I observed it mostly with portrait orientation. It wasn't a connection problem between the shoe and radio, it wasn't a battery issue, it wasn't a cycle time issue.

The metering will be different in portrait vs. landscape.

Feb 03 13 11:53 am Link

Photographer

Light Writer

Posts: 18387

Oakland, California, US

Leggy Mountbatten wrote:

The metering will be different in portrait vs. landscape.

How so? I was using center-weighted averaging, which I assume would not change based on orientation.

Feb 03 13 11:56 am Link

Photographer

Paul Ferris

Posts: 3587

New York, New York, US

Thanks again for all the help. It turns out that the hot shoe was not communicating with the camera at all. I took it to a repair shop, they replaced it and it is working like new.

Mar 06 13 11:14 pm Link