INSTRUCTIONS FOR PATERSON MAJOR FOCUS FINDER

[tonyowen34]

Does anyone have the instruction page(s) for the Major focus finder?
I'm referring to the tall spindly one, not the smaller Micro unit
If so could they send me a pdf copy or jpeg image as a PM

regards

Tony

 

[tedr1]

I have this model, but not the written instructions.

There is a single adjustment for the focus of the eyepiece. The eyepiece slides in the barrel, and there is a small screw on the eyepiece barrel which locks the eyepiece. In normal light hold the finder and look in the eyepiece, you will see a bright field and a crosswire, unlock the screw, move the eyepiece to obtain sharp focus of the crosswire, lock the screw.
For those wishing to take a little more care go outside and do the procedure with one eye at the eyepiece and the other eye open, relaxed and focused on a distant object, now make the crosswire focus adjustment. This method makes it easier to view the grain because the eyepiece is focused with the eye relaxed and focused at infinity.

 

[Harry Stevens]

These are the instructions that I got off the web a while back, whats below is not my words just the printed instruction for the tall Paterson focus finder and the authors comments that I came across and they worked for me..

" Adjust focus finder to your individual sight by releasing screw B then look through the eyepiece and slide it up or down until the graticule cross wire appears sharp and clear( my comment -no definition of what constitutes sharp and clear but see my comments below). This gves the most comfortable setting in use. Keep both eyes open while doing this so they are relaxed and focused on infinity( sounds as if it would be a bad idea to have a neg on the baseboard while doing this as it would be a distraction). Lock eyepiece screw taking care not to over tighten. Now here's the really interesting bit: "Note this adjustment is for individual comfort and does not affect working of Focus Finder which is permanently set for accurate focusing


After roughly focusing the picture place Focus Finder on the baseboard directly below lens. Look through eyepiece at graticule and adjust enlarger focus until image grain and cross wire are seen sharp and clear. The enlarger is now focused with critical accuracy. End of instructions.

My definition of getting the wire to its sharpest point is to get it to a point where the wire is delineated by the appearance of sharpness on both sides of the wire and the middle of the wire appears to have a thin light colour in the middle. It's almost as if the wire is composed of three lines. Two black ones on the outside and one thinner light coloured one in the middle but this isn't defined in the instructions. Anyone else notice this 3 lines phenomenon with the graticule cross wire?

 

[pentaxuser]

Yes Harry I have noticed this and like you I set the sharpness to get this effect.

pentaxuser