Automatic Shutter/Exposure times problem?

[JWH]

First of all, i'm new and this is my first post! Recently got infected with the beauty of ManualFocus lenses and I found some old ones within the family that I have been given!

Anyway ontopic! I have a Canon 450D and I got myself a M42 Adapter. Now i'm wondering if it's normal that the automatic exposure setting ( like 1/1000 ) does not work properly on MF lenses? Everytime I use a setting on the camera ( like P ) it gives me a shutter time which causes overexposure. So i'm basically forced to use the Tv ( Time Value ) setting in order to get the right lightning. However I can't imagine having to change this value for each and every photograph I am taking. What is the secret to this, if there is one?

[Olivier]

Hello JWH.
Welcome onboard.

You have to set your 450D on Av, or M.
If your adapter ring is with AF confirm chip, the chip is programmed on a certain diaph value. Mine is set on 2.
So, when I close my diaph I have to compensate exposure : 1 stop closed = -1/3 exposure.

On the 40D it is very easy to do, as the exposure compensation is on the rear wheel.
On the 450D, I think it's the same as on the 400D : you have to maintain the "+/-" button on the rear while turning the upper dialer.

[JWH]

Okay, I see. Well I don't have a confirmation chip ( yet, it's in the mail ). But I guess even without putting the Exposure Compensation a stop lower would give the same effect?

[Olivier]

[JWH]

I just took the camera + lens out on another test run through the garden and -1/3th stop did the trick! Thanks a bunch!

[Olivier]

Great.
I'm pleased that your problem is solved !

[Attila]

Nice to see you here!