I need help!!!

[Isaiah Dominguez]

I have a canon ae1 program with a fd 50mm 1.8 lens. When my lens is mounted the aperture is stuck at I'm guessing f2.8 ,I only can change it to 1.8 anything over 2.8 it does not change. But if I take the lens off I can change it manually just fine. What is the problem here? The lens or the camera ?

 

[mshchem]

I'm a Nikon guy. Someone will respond.

 

[BobD]

Set a slow shutter speed
With lens on camera, open the back.
Set different apertures on lens and fire camera while looking through lens from the rear.
Does the lens stop down to different diameters with different aperture settings?

 

[Vonder]

When mounted on the camera the aperture should remain completely open no matter what you set it to. It only stops down to the chosen aperture when you take a picture. Does your lens have a green "A" setting? Set it there and you pick the shutter speed, the camera will select the aperture.

 

[wiltw]

• There is a mechanical linkage between lens and body.
• When you move the aperture ring, it causes a little lever to move, which mechanically interacts with a lever in the body, telling the metering system what aperture is selected on the lens.
• If you remove the lens and actuate the aperture ring, you will see the location of the moving lever on the lens, and then you should see the corresponding lever in the mount, and it should be able to move freely...its position is passively determined by the position of the lever on the lens.

A mechanical link tells the lens aperture to stop down to shooting aperture when the shutter button is pressed.
The FD mount system allowed automatic diaphragm function, and a new signal pin (compared to FL mount lens) supported full-aperture metering.
A second signal pin for the "auto" setting of the aperture dial, plus a linkage to allow the camera to set the degree of diaphragm opening, enabled integral auto-exposure.
Understanding that will help to diagnose where your problem originates, in the inability to change the aperture ring position.

 

[Vonder]

Also, when off the camera, a FD lens aperture shouldn't change when you rotate the aperture ring.

 

[Isaiah Dominguez]

Set a slow shutter speed
With lens on camera, open the back.
Set different apertures on lens and fire camera while looking through lens from the rear.
Does the lens stop down to different diameters with different aperture settings?

I have film loaded

 

[Isaiah Dominguez]

Also, when off the camera, a FD lens aperture shouldn't change when you rotate the aperture ring.

You can change just hard to explain how to do so , you push down a couple levers and it allows you

 

[CMoore]

I have film loaded

You can rewind the film and then test the lens.

 

[Isaiah Dominguez]

• There is a mechanical linkage between lens and body.
• When you move the aperture ring, it causes a little lever to move, which mechanically interacts with a lever in the body, telling the metering system what aperture is selected on the lens.
• If you remove the lens and actuate the aperture ring, you will see the location of the moving lever on the lens, and then you should see the corresponding lever in the mount, and it should be able to move freely...its position is passively determined by the position of the lever on the lens.

A mechanical link tells the lens aperture to stop down to shooting aperture when the shutter button is pressed.
The FD mount system allowed automatic diaphragm function, and a new signal pin (compared to FL mount lens) supported full-aperture metering.
A second signal pin for the "auto" setting of the aperture dial, plus a linkage to allow the camera to set the degree of diaphragm opening, enabled integral auto-exposure.
Understanding that will help to diagnose where your problem originates, in the inability to change the aperture ring position.

 

[BrianShaw]

I have film loaded

Waste one frame. Set to slow shutter speed and f/16 and release while you are looking into the lens. If you’re lucky you’ll also get a self-portrait.

 

[Isaiah Dominguez]

Waste one frame. Set to slow shutter speed and f/16 and release while you are looking into the lens. If you’re lucky you’ll also get a self-portrait.

I tried it with bulb setting and held shutter while I had it set to f22 and the diaphragm was not closed anywhere close to that.

 

[Isaiah Dominguez]

Well

You can rewind the film and then test the lens.

I just tested it by wasting a shot I set it shutter speed to bulb and set it at f22 I looked in the lens and held down the shutter it did not close passed what looks like f2.8

 

[Isaiah Dominguez]

Okay idk what I did but it fixed it self. Wth

 

[Rick A]

Have you read the owners manual?
https://www.cameramanuals.org/canon_pdf/canon_ae-1_program.pdf

 

[Sirius Glass]

Have you read the owners manual?
https://www.cameramanuals.org/canon_pdf/canon_ae-1_program.pdf

If that does not help, visit a camera store [again if one is close by], or send it off for a CLA [Clean, Lubrication, and Adjust].

 

[Isaiah Dominguez]

Thx guys idk what I did but it fixed it self lol