It doesn't sound as if you'll have sensitivity problems Dave! If you do, you can measure contrast either with the lens wide open and/or at a smaller print size. Then go to the desired magnification and aperture and with the meter set to the contrast grade you established previously, meter a shadow. Increase the exposure until the LED moves to the shadow end of the scale, and that's your exposure.
Thanks for your order, I'll get that out as soon as I can.
I teach a modified f-stop method to find base exposure. We don't have f/stop timers but a chart is posted. I resisted teaching the technique as the enlarger optics were 3 element with poor performance wide open. However, the f/stop method was easier for students to find the basic exposure. After I changed how I taught exposure I replaced 3 element Belar lenses with improved Nikkor glass. You make do with what you got in a community DR.
Originally Posted by Keith Tapscott.
this may help