7DII release shutter without lens

[orbmansony]

I posted this in the astronomy forum, but have not gotten a response that works.

I am connecting a Canon 7DII to a Canon 2x TC to a T-ring on my telescope. The 7DII will not fire and gives an error message to clean the contacts to the lens.

Last year, I cut out a plastic ring to go over the contacts between the TC and the T-ring in order to get the camera to fire. It worked fine. If I remember correctly, I might have had to put the camera body in LiveView mode one time to get it started firing?

I set up the equipment this past week, and the 7DII would not fire either without the plastic ring, or with the plastic ring between the TC and the T-ring. Pressing the LiveView button has no effect.

But it does fire without an error message if I place the plastic ring over the contact pins in the camera body and between the camera body and the TC. But it could slip out of place as there's no central tube to hold it in place like the TC has.

Not sure why it is different this year, and it would be better if there were a setting in the camera to ignore the lack of pin contact with a lens.

Any suggestions?

Thanks,

Orb . . .

 

[RubenJ]

I posted this in the astronomy forum, but have not gotten a response that works.

I am connecting a Canon 7DII to a Canon 2x TC to a T-ring on my telescope. The 7DII will not fire and gives an error message to clean the contacts to the lens.

Last year, I cut out a plastic ring to go over the contacts between the TC and the T-ring in order to get the camera to fire. It worked fine. If I remember correctly, I might have had to put the camera body in LiveView mode one time to get it started firing?

I set up the equipment this past week, and the 7DII would not fire either without the plastic ring, or with the plastic ring between the TC and the T-ring. Pressing the LiveView button has no effect.

But it does fire without an error message if I place the plastic ring over the contact pins in the camera body and between the camera body and the TC. But it could slip out of place as there's no central tube to hold it in place like the TC has.

Not sure why it is different this year, and it would be better if there were a setting in the camera to ignore the lack of pin contact with a lens.

Any suggestions?

Thanks,

Orb . . .

Might the mirror become blocked by the ring?

 

[orbmansony]

I posted this in the astronomy forum, but have not gotten a response that works.

I am connecting a Canon 7DII to a Canon 2x TC to a T-ring on my telescope. The 7DII will not fire and gives an error message to clean the contacts to the lens.

Last year, I cut out a plastic ring to go over the contacts between the TC and the T-ring in order to get the camera to fire. It worked fine. If I remember correctly, I might have had to put the camera body in LiveView mode one time to get it started firing?

I set up the equipment this past week, and the 7DII would not fire either without the plastic ring, or with the plastic ring between the TC and the T-ring. Pressing the LiveView button has no effect.

But it does fire without an error message if I place the plastic ring over the contact pins in the camera body and between the camera body and the TC. But it could slip out of place as there's no central tube to hold it in place like the TC has.

Not sure why it is different this year, and it would be better if there were a setting in the camera to ignore the lack of pin contact with a lens.

Any suggestions?

Thanks,

Orb . . .

Might the mirror become blocked by the ring?

Nope, shutter will not fire without the ring in place, and fires okay with ring between camera body and TC. But last year I had the plastic ring between the TC and the T-ring. Don't know what setting is different now.

 

[Andy01]

Every Canon I have used for several years now has a menu function to tell the camera it can fire without a lens attached - often used for fully manual (ie. no electrical contacts at all) lenses.

Is that enabled ?

 

[orbmansony]

Every Canon I have used for several years now has a menu function to tell the camera it can fire without a lens attached - often used for fully manual (ie. no electrical contacts at all) lenses.

Is that enabled ?

That function is not on the 7DII - wish it was!

 

[Sittatunga]

Every Canon I have used for several years now has a menu function to tell the camera it can fire without a lens attached - often used for fully manual (ie. no electrical contacts at all) lenses.

Is that enabled ?

Every mirrorless Canon I've used in the last twelve years has that function in the penultimate C.Fn (orange camera-with-5-dashes-beneath icon) menu. None of my DSLR cameras have that function; my only SLR or DSLR camera that can't cope at all with a dumb lens or adapter is the EF-M.

The rest will give Av and M modes provided you set the aperture with the ring on the lens, but the EF-M has a graduated dial for f/number and expects the user to set the aperture from the body, not the lens.

 

[Andy01]

Every Canon I have used for several years now has a menu function to tell the camera it can fire without a lens attached - often used for fully manual (ie. no electrical contacts at all) lenses.

Is that enabled ?

Every mirrorless Canon I've used in the last twelve years has that function in the penultimate C.Fn (orange camera-with-5-dashes-beneath icon) menu. None of my DSLR cameras have that function; my only SLR or DSLR camera that can't cope at all with a dumb lens or adapter is the EF-M

The rest will give Av and M modes provided you set the aperture with the ring on the lens, but the EF-M has a graduated dial for f/number and expects the user to set the aperture from the body, not the lens.

My bad, I thought that my DSLRs had the feature too since I used fully manual lenses on them without a problem, but they don't (I went back and checked the manuals).