I am using a Sony A6300. When I shoot images with a Samyang 35mm f2.8 lens, power off, remove the lens, attach a manual non-electronic lens, power on, and shoot, the metadata will have incorrectly written in the lens model Samyang 35mm.It does not have the same problem if I previously power on with a Sony or Sigma electronic lens, then switch to the same manual non-electronic lens, the metadata will correctly have the lens model blank. This problem also doesn't show up on a NEX-6 body.It's annoying because when I import the RAWs to lightroom with the incorrect metadata, it will automatically assign the wrong lens profile of Samyang 35mm, and I have to then go and remove the lens profile. If I accidentally miss this step, it would ruin the images and I'd have to redo my workflow from the beginning.Does anyone else also experience this? With the Samyang 35mm f2.8? Other lenses? Is there any solution, or will I have to keep on attaching a Sony or Sigma lens after I remove the Samyang 35mm f2.8?I made further tests, and it does not seem that there are CA, distortion corrections applied by the camera body to the images shot with the manual lens while the wrong lens model is being assigned.

I did further experiments and it seems that I can get the EXIF data to clear, if I remove the Samyang lens from the A6300 while the power is still on. But the A6300 manual instructs to turn off power before removing or attaching lenses. I know that there are threads out there debating whether this is safe or not.Removing the Samyang lens while the power is off will not clear the EXIF data, unless you attached a Sony or Sigma lens before powering on again.I emailed the local Samyang and Sony support, but they simply point the finger at the other company.Scenario B possible solution: Remove Samyang lens while power is on - Results in correct EXIF data, lens model is blankScenario C inconvenient solution: Attach a different electronic lens immediately after removing the Samyang lens, to clear the EXIF dataThese are all the ways in which the EXIF continues to show the wrong lens model:Scenario A Error: Remove Samyang lens while power is off - Results in EXIF error, lens data not cleared

I updated the lens firmware to the newest version 4. But that did not solve the problem.So there are only 2 ways to clear the Samyang lens name in the EXIF after the A6300 was powered on with it attached.1) Detach the Samyang lens while the power is on.  If you power off before detaching, the lens name will be stuck in the EXIF when you shoot next with a manual lens.2) Power off, detach the Samyang lens, attach a Sony or Sigma electronic lens, then power on. The lens name will be updated with the new electronic lens.

1Plus2equals4 wrote:I updated the lens firmware to the newest version 4. But that did not solve the problem.So there are only 2 ways to clear the Samyang lens name in the EXIF after the A6300 was powered on with it attached.1) Detach the Samyang lens while the power is on. If you power off before detaching, the lens name will be stuck in the EXIF when you shoot next with a manual lens.2) Power off, detach the Samyang lens, attach a Sony or Sigma electronic lens, then power on. The lens name will be updated with the new electronic lens.Thank you, that worked! You solved the same problem I just encountered going from a Samyang 24mm to a Voigtlander 15mm manual lens. All of my 15mm shots showed the Samyang 24mm lens in the Lightroom metadata. I was also using a Sony a6300 if that makes any difference.Now, how in the heck can I remove  "Samyang 24mm" as the lens in the metadata section of Lightroom Classic?

You can use exiftoolgui, which still needs some command line, to batch edit the lens model in the metadata.

You can use different memory cards for handheld lenses to make it easier to enter the EXIF data later. You can use the plug-in for Lightroom. LensTagger:Add EXIF information such as aperture and focal length for manual lenses.The plugin is quite old, and it takes a lot of effort to find it and use it on modern versions.Used it with Lightroom 5.3 A few examples.

His problem is that the camera is writing the incorrect lens model into the exif, due to bad firmware. Switching SD cards won't help resolve the problem. Only the trick of disconnecting the problematic lens while powered on, or switching to a different powered lens will solve the problem before needing to edit the exif.

1Plus2equals4 wrote:His problem is that the camera is writing the incorrect lens model into the exif, due to bad firmware. Switching SD cards won't help resolve the problem. Only the trick of disconnecting the problematic lens while powered on, or switching to a different powered lens will solve the problem before needing to edit the exif.A colleague has a Foggy8 manual Voigtlander 15mm lens. When using the LensTagger plugin, it doesn't matter what was written in the error EXIF from Samyang 24mm. It will all be overwritten with the data in the plugin. You need a separate card to know exactly what it is for the 15mm focal length. And the aperture value needs to be fixed for every shot. You can write it down in a notebook or dictate it on a smartphone. For example, a screenshot of the plug-in window.Each manual lens has its own preset, so that you don't have to enter all the data every time. Let's say the Voigtländer Color-Ultron 1.4/55 AR with an aperture of 1.4 and so on.And different cards are needed to avoid confusion. For example, if you have different manual lenses on one card, you have to keep track of which lens is on which frame number in addition to the aperture value. I purposely gave in my examples two similar shots with Voigtländer Color-Ultron 1.4/55 AR и VOIGTLÄNDER COLOR-ULTRON 1.8/50

I guess switching the SD card helps when using multiple manual lenses consecutively.But if only using 1 manual lens with the Samyang electronic lens, the images can be differentiated by filtering for the aperture, as the manual lens will not have aperture information while the electronic lens will have it. The exif error in this case is only writing the false lens model.