Tim_H":28ilrebb said:
+3.00 dioptre lens will give you a working distance of 33cm, magnification approximately 75%
+2.00 dioptre lens will give you a working distance of 50cm, magnification approximately 50%
Adding glasses together will create a compound lens the overall power and magnification depending on the vertex distance from your eyes and the seperation of the two pairs of lenses.
You can also benefit from the inverse square law which basically means a dim light held closer to your workpiece is more effective than a bright one far away, basically as long as you avoid glare more light is usually helpful.
Sorry I know more about optics than scrolling!
Hello Tim.
Don't apologise as it's good a member here has knowledge of optics as the more diverse our members experience is, can only be of benefit to us all.
I don't pretend to be an expert on optics by any stretch of the imagination but I did (in my early years), make a 6" skeleton type Newtonion telescope.
Grinding the 1" thick glass blank was not what I would call fun, but very satisfying once finished then checked and aluminised by a professional.
The whole process gave me a basic grounding of optics which has helped in many areas of interest and not least scroll sawing.
I now use +3.00 reading glasses for scrollsawing as it suits the way I work.
I started out years ago (getting old now lol) with +1.25 glasses and then bought stronger glasses to suit as my eyes needed for scrolling.
I never threw the old glasses away as I knew they still had a use.
If I need to get that extra bit of magnification, I reach for one of my many pairs of old glasses and place them over my current ones and it works well for me.
BTW...The telescope gave me years of viewing the night sky in all it's glory.