change lens, change ISO?

In the landscape and travel section I posted a few shots regarding two lenses I was comparing. Tami 28-75 and Sig 12-20. I noticed after working on PP'ing these photos that the ISO had changed when I physically changed lenses...from 200 to 800 ..?? The last time I had used the new Sig was in the evening inside my house...does the lens hold an ISO change ?? Is there part of the ISO that workes in the lens or is it all in the camera body...I am at a loss to figure how this happened...possibly I changed lenses without shutting the camera (300D) all the way off..?? I'm sure it did not happen just by handling the camera...too many buttons to push all at once..

PEACHMAN wrote in post #2097256
Is there part of the ISO that workes in the lens or is it all in the camera body

Lenses do not change ISO. You were probably in the GREEN square mode or some automatic mode. Switch to M or Av or even P and you should be fine.

No..changing lenses has no effect on ISO. You might have done it by accident,
What mode were you shoting at?

LightRules wrote in post #2097263
Lenses do not change ISO. You were probably in the GREEN square mode or some automatic mode. Switch to M or Av or even P and you should be fine.

No, I live in the AV mode and constantly change it's value and watch the shutterspeed but usually only check the ISO when I feel a need for more light...and thinking you may have a point , checked the exif and it was on Av....thanks though...

Stavhp wrote in post #2097265
No..changing lenses has no effect on ISO. You might have done it by accident,
What mode were you shoting at?

I almost always shoot in Av mode...I go for DOF first in my style of shooting and the camera just clicked over 10,000 and back to zero...I don't think an accidentel manual ISO change was what happened....something spooky is at hand here!

PEACHMAN wrote in post #2097325
something spooky is at hand here!

Yeah. Senility is like that.

Sorry, Peach. But unless you can replicate this phenomenon, then the evidence points strongly toward user error.

On the 300D it's really not hard to make this sort of mistake. Inadvertently pushing the ISO button while changing the aperture could do it.

The ISO fairy strikes again

Ya, unfortunatly curtis probably has the answer...I was hoping there was a common problem and I would be vindicated from the accusations of "improper ISO use" as it comes with heavy penalities, like loss of image..and as my dear old departed Dad use to say, (for some reason to me more often than most..,"excuses are often interesting but seldom of any consequences"

PEACHMAN wrote in post #2097496
..,"excuses are often interesting but seldom of any consequences"

I like it! Wise man, your Dad.

Titus213 wrote in post #2103611
I like it! Wise man, your Dad.

I heard this all my life at approprate times....he wouldn't tell me where it came from 'til he was on his death bed,literaly.......He was the lead navagator/bombadeer with a squadron of B-24's during WWII and apparentlly after bombing the wrong target on Formosa they were summoned to the base commanders quarters and he and the pilot began a list of excuses...the base commander offered this line in what must have been a very persuasive manner.. He said he never in his life offered an excuse after that...he was always , in my life time , a man who took responsability for his own actions..

I have heard a more severe explanation of an "excuse".

Excuse - skin of a reason, stuffed with a lie.

Bosman wrote in post #2106069
I have heard a more severe explanation of an "excuse".

Excuse - skin of a reason, stuffed with a lie.

Oh Bosman...I love that! It will go in my very small group of quoted "isms" !! Thanks!!

Hmmm... I know if I change lenses on my 300D without powering completely down it will act crazy!!! Usually a freeze...

I must admit that I'm slightly paranoid about changing lenses etc. whilst the camera is switched on...

kevin_c wrote in post #2106864
I must admit that I'm slightly paranoid about changing lenses etc. whilst the camera is switched on...

Ya guys..I know it's not a good idea and wouldn't do it on purpose, but may have timed out between shots and keeping Myles from going off the bridge or being lugged off by coyotes....I really don't remember turning it off first,,