Hard infinity stop to be trusted?

Started Apr 25, 2014 | Discussions thread
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Hard infinity stop to be trusted?
Apr 25, 2014

One of the advantages of older lenses is that they have a hard infinity stop, i.e., you turn the focus ring all the way and you're at infinity. This is great for astrophotography and other night time photographic activities where (auto)focussing is problematic.

However, I just checked my 50 mm f/1.8D which seems to have a hard infinity stop, but when I focus on some trees at least 100 m away they're not quite razor sharp with the focus ring turned all the way; I need to back off ever so slightly.

It could be that this lens doesn't have a hard infinity stop but focuses just a hair beyond infinity by design, maybe 100 m isn't quite infinity, maybe there is some build variation or maybe the D7100 is a tiny bit shorter than what those lenses are built for... I don't know.

So my question is: if a lens (seemingly) has a hard infinity stop, can this be trusted?

 iljitsch's gear list:iljitsch's gear list
Nikon D7100 Nikon AF-S DX Nikkor 16-85mm f/3.5-5.6G ED VR Nikon AF-S DX Nikkor 35mm f/1.8G Nikon AF Nikkor 50mm f/1.8D Nikon AF-S Nikkor 70-300mm f/4.5-5.6G VR +4 more
Nikon D7100
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