Bill Satko
Member
- Messages
- 3,223
- Location
- Methow Valley
Anyone have any experience with visor magnifiers like this:
What I am specifically looking for, is what focal length should I get. I plan to use it for sharpening my back saws. I probably need a lot of magnification, but the trade off is the focal length becomes smaller, which means your head needs to be closer to the work to bring it into focus.
The chart below is what is available in lenses.
Pwr = magnification power and FL = focal length.
. No . . Power. . FL
. .2 . . 1.50 . . 20"
. .3 . . 1.75 . . 14"
. .4 . . 2.00 . . 10"
. .5 . . 2.50 . . .8"
. .7 . . 2.75 . . .6"
. 10 . . 3.50 . . .4"
I am thinking no. 4 or 5, but do not have any idea. All help would be appreciated.
What I am specifically looking for, is what focal length should I get. I plan to use it for sharpening my back saws. I probably need a lot of magnification, but the trade off is the focal length becomes smaller, which means your head needs to be closer to the work to bring it into focus.
The chart below is what is available in lenses.
Pwr = magnification power and FL = focal length.
. No . . Power. . FL
. .2 . . 1.50 . . 20"
. .3 . . 1.75 . . 14"
. .4 . . 2.00 . . 10"
. .5 . . 2.50 . . .8"
. .7 . . 2.75 . . .6"
. 10 . . 3.50 . . .4"
I am thinking no. 4 or 5, but do not have any idea. All help would be appreciated.