1/2 circle in image

[george_smith15]

I'm getting a 1/2 circle in my print from photos shot in av mode on a canon 30D camara... Have changed lens and it

stays yet in M mode with flash it's not there... any ideas?<div></div>

[Matt Laur]

Can you re-size an example image down to under 700 pixels wide, and post it here so that people can see what you mean?

[goulden]

it looks like what happens when a shutter is about to die, seen it posted many times here on photo.net

[george_smith15]

The shutter has around 25000 photos on it... it was a Canon Referb... which up until last week was working fine... as i say .. night stuff is all fine with flash..

[mwtphoto]

looks like the shutter curtain is slow when recending

[mark u]

With flash, the shutter is fully open when the flash fires. With long night time exposures, any leak through a shutter curtain makes no significant difference to the total exposure. With a shutter speed of 1/4000th used in your shot, the light leak will be very evident. The shutter curtains are moved by levers that swing in an arc: think of the blades of a Venetian blind being bent by someone peering through - this is what happens to the shutter curtain as the lever attachment points wear out. The shutter needs replacing.

[mwtphoto]

that should read receding

[christopher hartt dallas]

I've seen something very similiar to this with a 20D which has gone from inside A/C to outside hot/humid conditions. Might this be possible for you?

[mark u]

I can't imagine why changing from inside to outside will cause the shutter to fail, though I can imagine that shutter failure might (at random) coincide with moving from inside to outside. It would take a very rapid extreme temperature change to cause metal expansion/contraction sufficient to cause damage, such as dipping the camera in liquid nitrogen.

[christopher hartt dallas]

I'm not suggesting that temperature "jolts" (A/C to high humidity without equalization) causes mechanical failure, but it DOES result in condensation which for non-sealed bodies results in a variety of issues, including half circles like the one above.

[joelh47]

There is no question in my mind that this is the pending shutter failure mentioned by James. I had the exact same

problem with my 30D a little over a year ago. Here is the link to the post I made about it at the time, including links

to example photos.

 

http://www.photo.net/bboard/q-and-a-fetch-msg?msg_id=00Kisc

 

I wound up sending the camera to Canon to have the shutter replaced. It has been fine since. Hopefully you still

have some of the refurb warranty left. A shutter replacement is a bit over $200, I think. Don't put it off too long before

you get it fixed--I read about one individual who waited and later suffered a catastrophic shutter failure, blades

mangled, etc. It required a much more expensive repair than the simple shutter replacement.

 

This seemd to be a fairly common problem with 10/20/30 D series cameras. Hopefully, Canon have improved the

shutter reliability with the 40D.

[zach_rivers]

if your camera is no longer under warranty, i would consider a local repair shop. when my shutter died, i got it repaired for 75 dollars at my local store, and in three days, rather than having to ship it all over the country.