Setting for 106lpi with 600dpi laser printer?

[martin.koch]

My book on demand printer prints black and white photos on 600 dpi IBM laser printers on uncoated stock with a line screen of 106-lpi.

Should I save my photos from Photoshop with 212 dpi (quality factor 2) or can I leave them at 300 dpi? File size is not an issue.

What output sharpener setting should I use?
Is the halftone output sharpener appropriate?
There is no 106-lpi setting.

Thank you for any advice.

[martin.koch]

No answer so far. Is my question dumb or already answered in this forum? I didn't find it and there is no search.

What output sharpener setting should I use for a 600dpi laser printer and 106 lpi?

Please reply!