How is the focal distance needed to observe details? How about light power?
1014385
The focal distance is needed as if you are too close or too far from the desired object or surface , it would be blurry. Or you would not be able to fine tune the resolution on the screen. Detail would be lacking. The light power is great and produces images of great resolution. Alexys M. Sears
1014386
Focal distance is pretty good. It is a bit fuzzy at point blank range but from about 1/2" to say 3' or 4' I could clearly see what I was looking at. I stuck it down my drain to check the condition of the pipe and look for blockages and I could see from the camera tip to fairly far down the pipe. The light was bright enough for me to see clearly in dark areas around the camera tip.
1014387
I didn,t use it on anything because the on-off button had to be held down to make it stay on. I did notice the screen was bright but i boxed it up and sent it back, and got a dewalt which is working very will for me.
1022249
The dispersion is adjustable. With the shortest focal length you can clearly see the array of LEDs making up the light. It is very bright. It is bright enough to see in pitch black.
2217648
IS will not matter at this focal distance. Only start worrying about IS (or VR as Nikon refers to the technology) past about 70mm
648774
In my personal experience, it's a bit difficult to focus in lowlight situations. If it's as dark as a room with very dim lights, then I do not recommend this. In addition, I try to keep the ISO at a max of 1600. If I have to, I will go up to 3200. The noise/grain is noticeable around 3200, and it is a bit noticeable even at 1600.
1659402
Don't know the amount of magnification. I do know that in dark restaurants the light from it makes seeing the menu much easier.
2217647
The focal length is only 35 max, you don't need IS at this point. The further the focal length goes, the more you need IS. Don't worry.
454569
It depends on the limiting magnitude (i.e. the faintest objects you can see with the naked eye) where you plan to observe (see wikipedia.org and search for 'limiting magnitude' for more information). For reasonable conditions (lim. mag of 4-5) you'll need an extra ~8-9 mags, so a 10 inch or more should do it. If you plan to observe in 'perfect' conditions you might be able to get away with a smaller telescope, even down to 5 inches, but it would be pushing it. So, &gt;10" if you want to be on the safe side, &gt;5" if the conditions are very good.
1850974
Fixed focus, does not zoom, approx. 2.5' diameter spot at 20'. never timed it's battery life because I've never used it more than about 30 minutes
1391956
It all depends on how detailed you want to see. I would recommend 80 feet to get a clear image that you can at least identify a person with daylight.
757052
Hope my answer is not too late. The included 20mm and 10mm eyepieces reach 50X and 100X power. In daytime landscape viewing, especially a lake in summer, the power might be too much. Mostly you will not see a stable image due to evaporation. I tried viewing farm land in summer, the image was not stable when reached 30X with my other eyepieces. So you probably will need eyepieces with longer focal lengths. You can also try spotting scope with zoom magnification.
265365
You can focus on objects as close as 1.5 feet. For distance viewing, it brings everything 6-8 times closer depending on which model you get.
2104902
First extend it to full length, then adjust the focus. And you can only use it for distant objects. I don't have it now but I remember it do require some trial and error.
306697
You'll need to be within about 6 inches to use this magnifier. You might consider a pair of folding Opera Glasses. They can be found inexpensively (on amazon), unfortunately you'll probably need to be 3 feet away to get them to focus... it may say in the product description. I have a monocular that lets you focus in very short distance... little more expensive, but very handy.
1425892
Viewing a rock or plant? you will need a stereoscope for that. But if you have to slice it thinly, it has to be between 3 to 5 micrometers to make that happen. if it is thicker, there will be not much optical clarity, cells will be overlapping. Good luck to you my friend.
1711582
you will need a light source as you would with any camera in the dark. it can be full spec or just IR or both it will see this type of light due to its modification
1693389
Possibly but I would recommend a microscope with at least 60X. You can also find ones for a few more dollars that have LED and UV lighting.
2106272
Focus wise it can be as close as less than 6 feet for my eyes (I think it depends on viewer's eyesight). However, the real problem is the images from two eyes don't over lap very well when the object is this close. If you want to observe something that close, Pentax Papilio is designed for that purpose and has very good reputation.