Think that good lenses can't be cheap? I don't know. But unique lenses that deliver great results can definitely be cheap. Canon 50mm f1.8 LTM is a good example of that.
Canon 50mm f1.8 LTM Lens Review - 50mmF2
Canon 50mm 1.8 LTM - mainly at night - Photo Thinking - Lens Review
Used and in fair condition Canon 50mm f/1.4 MF Lens LTM L39 For Leica L-Mount for sale.
Canon 50mm f/1.4 MF Lens LTM L39 For Leica L-Mount(Used) – Kolari Vision
Canon 50mm f1.8 LTM Lens Review - 50mmF2
Canon 50mm f1.4 LTM
Review: Canon 50mm 1.2 LTM
Leica Showcase - Canon 50mm F2.2
The Canon 50mm f/1.4 LTM - Don't Call it the Japanese Summilux
For Sale - Canon 50mm f1.8 LTM Photography Forums
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S 50mm f2.8 - FlynnGraphics