Thank you for your interest in LOMO Microscopes and Optics Planet, Inc.
I would rather suggest [url=http://www.opticsplanet.com/lomo-sf50ba.html]SF-50BA configuration of LOMO SF-Series microscopes
(you were asking about SF-100)[/url]. This model
offers larger working distance (170mm - 6.75") and comes with a very convenient mounting system called "swing-arm", thus allowing you to use your bench or table for engraving work on silver and gold.