So this is a question about aps-c and full frame 'lenses' and not sensor format. My sensor here is constant - a Canon APS-C.
This might be an already answered question but I couldn't find any that completely clarified me. There are so many confusing answers to this I got from multiple sources. Many people on YouTube keep mentioning the zoomed in effect of the aps-c sensor which got me confused. So apologies for asking the same thing again.
As I said I have a Canon crop format (1.6x) and till now I've been using the kit zoom lens (EF-S) for astrophotography. I've decided to switch to a fast prime lens and I know that I like the FOV I get at around 50-55mm with my current EF-S lens.
Now the cheapest fast prime i could get for this job seems to be the Canon Nifty Fifty and I can get hold of one easily. But this is the 'EF' lens and not 'EF-S'.
My question is, to get the same fov at a certain focal length of an APS-C lens on an APS-C sensor, should I get the same labelled focal length on a full frame lens, or should I get an EF lens 1.6x wider? (50mm EF or 30mm EF to mimic 50mm EF-S?).
In other words, are APS-C (EF-S) lenses labelled with a focal length that gives equivalent FOV of a full frame lens, or labelled with its actual focal length?