What is the focal length of the 3.5X magnifiers? I need to see 18-24" from my work - will these focus at that distance?
589186
Yes this headband magnifier will be in good focus at 18 to 24 inch range. I am happy with mine. I spread butterflies using mine. I have no focus problems at 24" or much closer. For the price this magnifier is as good or better than much more expensive one.
589187
I'm not exactly sure what they are. I bought them for my husband who paints inch and a half figurines. He holds them anywhere from 12 to 3 inches away from his face.
261655
I agree with you, measure the Objective Lens and see if they have the size you need, no doubt they will work. Make sure to measure and convert inches to millimeters.
1905092
Joyce, there's nothing listed on the magnifier itself. I'm fairly certain it's about 3x magnification, with a "spot"of about 5x. Hope this helps.
1028028
It's a microscope, so it seems to work best close up; otherwise you don't have magnification. With that said, I can focus in the lower magnification on an object about 1 meter away, but it isn't really magnified. The higher magnification requires me to be almost touching to focus. This isn't very scientific, I don't know enough about lens math to be, so I just tried it out around the room.
381968
2nd answer. If you mean the closest distance you're able to focus at? I can only guess at about 15 to 20 feet. If you mean the closest distance you can calculate by using the mildot system I would again guess as close as you can get a clear focused picture. Mine gives me a very clear picture fifty yards and out but I could not honestly tell you the minimum useful distance.KT
1951967
No idea what the focal lenth of the magnifyer is...I do not have the box to find that info...But I love mine. I am sitting at the table without my glasses and doing beading with very tiny beads and able to see well with this on.
862233
I can close focus at 7 feet with a 1/4 twist of the black ring near the objective. The little knob is where you can mount it to a tripod.The slider from "15x to 55" is near the eyepiece and just slides 1/5 turn easily and smoothly. It is really 10x to 25x.
1021954
It is true that they need to be re-focused if focused with zoom setting. However, I am not sure that is a manufacture defect or just the design. They work fine for me. But then again, I don't mind refocusing for the price I paid for the set of binoculars.
1116494
I dont know the focal length but have used it succesfully from 2" from the specimen to 14". You should easily work with your hands between the specimen and scope. Focus takes a minute, and make sure you buy the articulating stand. Computer viewing is simple.
560712
I don't think the magnification can give you a good image if you are more than 20ft away, I use it for positive id for close quarter targets
206407
Thank you for contacting us. As per the manufacturer, the focal length is 24-105mm. Please feel free to call us at 1-800-991-3350 if you have any further questions!
1548302
Great question! I bought mine for similar work. At low mag the camera will be focused at about 12" from the work. As you go up to high mag, the camera will need to be closer, and sitting on the part at max. With camera about 6" from work, the magnification is really good for wires in the 0.002" - 0.010" range.
2236258
According to the spec the minimum focus distance is .82 ft. Of course with close up filters you can easily go closer. That is what I do.
265367
They are very clear and are fine for farther distances but recognize that they only magnify 8.5X.
1379828
I am just guessing but I assume it is 2 and 1/2 magnification; I have one of these and the cord that you put around your neck can be adjusted to bring your work into focus so I wouldn't worry about it. I love mine! Well worth the money!
1953472
I did not save the box, and the Magnifer itself doesn't say what the magnification is. I would hazard the guess that it is 2X or 3X, with greater magnification in a small spot within the larger glass. Whatever the magnification is, I find it to be what I need for doing beading work...but I am nearsighted and so don't need much correction to do close-up work. Someone who is farsighted, or who uses reading glasses, might need something stronger. I hope this helps!
354491
It says Macro in its name, so it should be able to focus on short distance. However for better performance use reduction. 36mm worked good for me - like microscope