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| AmScope stereo microscope - lens question |
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| bicycleguy:
On my AmScope the ring that the LED ring attaches to can be unscrewed from the .5barlow and then reattached in its place. Thats how the scope came before I added the barlow. There is also still an LED attachment ring even without adding the one removed. The other lenses are a little close then though. |
| KL27x:
Tried to use someone else's microscope the other day and the image was blurry and wavy and was way off from parfocal between left and right eyes. A bit of examination revealed someone screwed the LED ring onto the objective and then stuck the barlow in the end of the LED adapter... which there was no threading there, even. It was just stuck in there with a loose friction fit waiting to fall out so that it would finally stop causing headaches and blindness. |O If you increase magnification by using higher power eyepiece, you may end up needing more light. Leaving the barlow lens on there does two things. It spreads the available light over a larger area (which with your high power eyepieces, you are just "losing" that part of the image, so that light is pissed away), and it also makes your LED ring farther away from the thing you're looking at. When you need more magnification, this loss of light can be significant. The image will also suffer more distortion this way, once you solve the light problem. But the biggest problem IME will be the light. Even with the regular 10x eyepiece, the image at 22x zoom with the 0.5x barlow is way dimmer than 22x without the Barlow. More zoom can be deceptive. It is obviously bigger, but you may be straining your eyes just as much to see the details, due to the dimmer image. Personally, 0.5x Barlow is perfect for me. I know people who prefer the 0.3x, even. But there's a 0.7 if you want a compromise with more magnification and still have a bit longer than normal focal distance. |
| jfiresto:
If the microscope were a digital camera, going from 10X to 20X eyepieces would be like adding 2X digital zoom and a neutral filter that darkens two f-stops. Not a problem if you have enough light and the camera has the megapixels and optics that make full use of them. Another thing to add (which you don't experience with a digital camera), is that you may have to position your eyeballs more precisely because of the reduced field of view. As I wrote, swapping eyepieces is quick and dirty, but handy enough that I do that, when I need a quick look, rather than: * remove the ring light * remove the auxiliary lens * lower the microscope * add the ring light * refocus the microscope * ... * remove the ring light * add the auxiliary lens * raise the microscope * add the ring light and * refocus the microscope.Your call! |
| Stiletto:
--- Quote from: SolderSucker on December 24, 2018, 04:33:05 pm ---I currently have a 0.5x Barlow lens on my AmScope but would also like to remove that at times and enjoy the even better magnification without the Barlow (that gives less clearance between the lens and the PCB of course). Is it just a case of adding a standard 48mm filter or similar? I need to add something of course to protect the built-in stereo lenses, plus I need a filter that has a receiving thread that will also accept the plastic adapter that I need to screw on so that I can attach the LED ring light. Thanks --- End quote --- SolderSucker, You might want to consider a 1x Barlow or auxiliary lens, which effectively is nothing more than a protective lens in an aluminum frame, machined with a groove to accept a light ring. I have one, and it works wonderfully for when I choose to remove my 0.5x barlow and operate using the scope's native magnification. Using this option, you dispense with having to use a separate plastic light ring which to me makes things a bit simpler. You can get one for very reasonable prices on AliExpress https://www.aliexpress.com/store/product/Lucky-zoom-SZM1X-Auxiliary-Objective-Lens-For-SZM-Stereo-Microscopes-48MM-Free-Shipping/300856_32732105180.html Or at Amscope directly https://www.amscope.com/accessories/barlow-lens/1x-barlow-lens-for-sm-stereo-microscopes-48mm.html Hope this is helpful! |
| SolderSucker:
Thanks very much. :) |
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