There are thousands of lenses out there in many different mounts and variations that are still compatible for digital cameras.
As far as 3rd party lenses, many of them are not very good. However there are a few gems out there that are optically equivalent or even superior to pro modern lenses today. There are many that simply have not been reviewed before or discovered. My goal is to hunt a few of them down, review them and make these gems known.
There are also some lenses that we know are good but when we investigate a side by side comparison there are no actual photos displaying an optical comparison. My hope is to compare a couple of them side by side. A VS comparison which we all love!