Question about Old 135mm F2.8 Prime Lens adapted to Canon Rebel T7

[RScottie103]

I purchased an adapter that allows me to use my 40+ years old Pentax K Lenses on my Canon Rebel T7.

As you can see from the picture below, the information on the shot says the lens is a 50mm. As this is a totally manual lens with no pin connections, the Camera has no way of knowing what the lens is so that data must have been left over from the previous 50mm Canon Lens I had attached.

Is there a way of correcting this data in camera for later recollection?

 

[Ysarex74]

I purchased an adapter that allows me to use my 40+ years old Pentax K Lenses on my Canon Rebel T7.

As you can see from the picture below, the information on the shot says the lens is a 50mm. As this is a totally manual lens with no pin connections, the Camera has no way of knowing what the lens is so that data must have been left over from the previous 50mm Canon Lens I had attached.

Is there a way of correcting this data in camera for later recollection?

View attachment 290077

Unfortunately no. It can't be done in camera if you have a "dumb" adapter. However it can be corrected in post processing with an EXIF editor.

 

[Don Fischer]

Unfortunately no. It can't be done in camera if you have a "dumb" adapter. However it can be corrected in post processing with an EXIF editor.

So what in that photo do you think the camera should improve on? I'd be more than happy with that photo! You may change it somehow in post processing but I doubt you'd make it better, just different!

 

[Ysarex74]

So what in that photo do you think the camera should improve on? I'd be more than happy with that photo! You may change it somehow in post processing but I doubt you'd make it better, just different!

I was answering the OP's question about the lens adapter and could it add the lens info into the EXIF data. I wasn't commenting on the photo. But since you ask, the photo could be improved in post processing. For one I'd give it a black point. I'd crop it, add a vignette, and sharpen it.

 

[RScottie103]

So what in that photo do you think the camera should improve on? I'd be more than happy with that photo! You may change it somehow in post processing but I doubt you'd make it better, just different!

I was mainly concerned with the technical information that is embedded in the data that id's the lens used, focal length, and aperture.

That information is incorrect on the lens and missing on the aperture information when checking the shot later in my computer.

 

[smoke665]

And that's the downside of dumb adapters. I have the Japanese version of the Takumar 135mm f/2.5. Absolutely love the IQ, soft creamy bokeh, great color rendition. It's not quite as sharp as the A 135, but for portraits, in the f/5.6-8 range its perfect, and unlike the A there's no purple fringing to deal with.

 

[cgw105]

Simply put, there's no electro-mechanical connection between the two, hence no data transfer.

 

[Inphoto28]

If you have a chipped adapter it is possible to program the focal length in, but these adapters won't work on mirrorless canons.

 

[jeffashman2]

I have an adapter that I've used to attach an old Vivitar 28-210mm Yashica mount lens to my Canon, as well as an adapter to attach an old Soviet 58mm. The Vivitar is ok, but I really like the images the Soviet lens produces. The nice thing with the Canon 90D is the focus peaking capability, and your T7 may have the same feature.

 

[Don Fischer]

I purchased an adapter that allows me to use my 40+ years old Pentax K Lenses on my Canon Rebel T7.

As you can see from the picture below, the information on the shot says the lens is a 50mm. As this is a totally manual lens with no pin connections, the Camera has no way of knowing what the lens is so that data must have been left over from the previous 50mm Canon Lens I had attached.

Is there a way of correcting this data in camera for later recollection?

View attachment 290077

So, what's wrong with that photo?

 

[RScottie103]

So, what's wrong with that photo?

For my first shot with it, it's not too bad to me.

I was just thinking it was just a tad overexposed and the grass should have been a little greener. WB was set to auto.

The sun was pretty harsh though.