What is the difference for znse 20mm & 25mm lens of the same focal length?
What lens is better for cutting 20mm or 25mm (same focal length) ?
What lens is better for engraving 20mm or 25mm (same focal length) ?
Iam building a laser machine with co2 rf tube and must choose laser head and i have 2 options
1) head that accepts 25mm lens
2) head that accepts 20mm lens
What to choose and why ?
Thank you.
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20mm vs 25mm znse lens
