topic Re: Camera misbehaving after switching lenses in EOS DSLR & Mirrorless Cameras

EOS Rebel T1i misbehaving after switching lenses

Crica — Sat, 05 Jul 2025 18:39:02 GMT

Hi,

I recently got new lens for my old Rebel T1i. The previous one is a 18-55mm, the new is a 70-300mm. The new lens is great and works perfect. But my old one started to "misbehave" after switching back to it. It won't focus right away, and sometimes not even shoot! I'd have to zoom in/out until getting to work again. It sounds like it has to "readjust" back to the camera. Am I doing anything wrong with the switching? I'm very carefull there's no dust around while I do that, so I have no idea of what/why is happening. I'd appreciate any help someone can offer. Thanks!

Re: Camera misbehaving after switching lenses

Waddizzle — Mon, 18 Sep 2017 23:50:05 GMT

If the lens is old, then it could be jealous of the new lens.

Switching lenses should not affect the lens performance. Just make sure to power the camera down when you change lenses. I know how hard it can be to remember to power down the camera to change lenses, because most of the time I am in a hurry when I do it.

Not powering down the camera to change lenses is a recommended best practice. Not doing seems to harm nothing, but Canon would not make the recommendation without good reason. It gives your older camera [a chance] to "reboot" itself, too, [with the new lens installed].

Re: Camera misbehaving after switching lenses

John_SD — Sat, 16 Sep 2017 17:48:06 GMT

@Crica wrote:
Hi,
I recently got new lens for my old Rebel T1i. The previous one is a 18-55mm, the new is a 70-300mm. The new lens is great and works perfect. But my old one started to "misbehave" after switching back to it. It won't focus right away, and sometimes not even shoot! I'd have to zoom in/out until getting to work again. It sounds like it has to "readjust" back to the camera. Am I doing anything wrong with the switching? I'm very carefull there's no dust around while I do that, so I have no idea of what/why is happening. I'd appreciate any help someone can offer. Thanks!

Misbehaving? This kind of behavior can only be attributed to a poor upbringing. However, the lens sounds too old to expect much in terms of "readjustment," so it may be time to cut it loose and adopt a new and better behaved lens.

Re: Camera misbehaving after switching lenses

Crica — Sat, 16 Sep 2017 18:04:53 GMT

"If the lens is old, then it could be jealous of the new lens"

I had that thought too, lol

I always have the power down...

Re: Camera misbehaving after switching lenses

Crica — Sat, 16 Sep 2017 18:08:44 GMT

It sounds like my lens has "expire"? Never thought of that.
Ohhh... that makes me sad... I'm attach to it 😕
Thanks for your reply.

Re: Camera misbehaving after switching lenses

kvbarkley — Mon, 18 Sep 2017 14:56:12 GMT

I had a problem like this, and started to make sure that the camera was off before changing lenses. It seemed to happen when I left the camera on.

Re: Camera misbehaving after switching lenses

Crica — Mon, 18 Sep 2017 17:02:03 GMT

But I always turn it off... 😕