I use 2.5 mag reading glasses for basic viewing.
For getting up real close just a hand held 10x magnifier.
Yep, the kind you get at the drugstore for cheap works just fine for soldering. For really fine work I use a stereo microscope. But for basic soldering, reading glasses are just fine.
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Its the fine SMD 0.5mm micro's I have trouble with.
Even if it looks good under magnifier there can sometimes be a short behind a pin.
What I do is when I design the pcb is put a row of vias next to the micro so I can buzz between adjacent pins.
Spent half an hour trying to remove a short on an A2D converter only to find they were connected on pcb anyway ! doh !
For fine scale SMD I stick it down with solder paste first to help stop it floating around.
I then solder tack it and check it hasn't moved.
Then apply big blob of solder to iron tip and slowly run it along pins making sure every one gets solder.
Quite often there are blobs of solder so I remove them with copper braid.
A final buzz with the DMM and all is well.