Question about lens recognition

[Jackalope]

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I recently purchased a CV 21mm Color Skopar and started using it on a trip to Mexico. I forgot to check / set the lens recognition function, and when I returned, Lightroom seems my images as coming from a 50mm Noctilux. Aside from the differing composition frames in the viewfinder, has this had any other effect on my images?

Thanks for any wisdom you can share!

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[Jackalope]

Thanks; and what about fir 21/3.5?

[UliWer]

Well, you might look yourself if there is any effect to be seen on your images: a 21mm lens may be problematic for the sensor as light comes at an unfavorite angle to the sensor*s edges. This may produce color casts (magenta or magenta and cyan - so called "italian flag"). Lens recognition may help to correct these color casts. If you apply a "wrong" recognition and the correction of color casts is not sufficient you will see it on your results. If there is nothing you feel uncomfortable about the wrong lens recognition will only have an effect on your EXIF data, but not on your images.