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Article ID: NBR2375 — Created: 6 Apr 2021 — Reviewed: 19 Apr 2021

Symptom

Sometimes, when focusing on a new slide, I get strange black bits instead of the focused specimen that I expect.

Cause

This appears to be dust or debris on the coverslip. It is a normal problem to encounter.

Resolution

Move the objective down about 850 steps (0.170mm) to focus on the specimen.

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