Dear Optics people, I'm going to simulate an objective lens with information for surfaces from a US patent. I fulfilled the lens data editor based on the values of the patent but didn't get the result because there were no values for the semi-diameter of surfaces. How it can be completed?!
Thanks in advance. Amir
https://preview.redd.it/zp42c5g2vt981.jpg?width=1339&format=pjpg&auto=webp&s=80a8409a779e381a6ae8b2d5b2be05e851a7970d
https://preview.redd.it/xmuroyr3vt981.jpg?width=640&format=pjpg&auto=webp&s=66d8eea8085311c052ab0981b99cee873aed9a13
I'm just guessing but the ripple likely have alot to do with the holographic nature of the marking but I need to look at a few research papers to confirm
Setting and setup for this:
50w jpt 175mm lens
600mms
50%
100khz
0.025 hatch +3mm focus
Hello all, I recently acquired a microscope and it appears that the objective lenses are rather dirty… is there somewhere I can bring these for a cleaning? I’m in the Boston area. Thanks !
Hi,
I have been building a DIY microscope (see Pic.) for digital holography. I was wondering if there are any downsides to not using a tube lens to relay the field to the sensor in conjecture with a water immersion infinity corrected objective? I know that without using the tube lens the working distance is now changed (slightly more than before) and keeping the sensor closer to the objectives decreases the magnification.PS: I see distortions when I image 1 micron sulfate beads, possibly due to a tilt in the sensor.
https://preview.redd.it/zarcp74blqq71.jpg?width=3024&format=pjpg&auto=webp&s=8125680ffe023f6fd11bd89864a83da0ffcebde3
So yesterday I took out my scope objective lens assembly to clean the lenses. There was dust and moisture hardened specks so decided to clean it with an alcohol solution.
I observed that the objective is an achromatic doublet - double convex followed by what I think is a double concave but could be a concavo - flat as well. Unfortunately I dropped the convex (its fine whew) and now I don't know its orientation in the assembly.
I know the convex sits in the front and the concave behind it. And also the concave lens needs to have its more concave side (more curvature) towards the front.
But the convex piece feels like it has two different curvatures on either side and I don't know which side sits in the concave well. I tried to kind of feel which side fits the curvature well but it was tough, as the curvatures on both sides are very similar to each other and also not pronounced enough (long focal length).
Any leads or clues and help appreciated.
I have a set of anvis and was browsing around to see what I could do to upgrade my stuff to a more durable set up. It appears that act in black used to have an anvis dtnvs that’s currently discontinued but I was curious if anyone here knows if I could use the parts from an anvis and use them in one of the other housings?
I use a Olympus microscope that is infinity corrected. I cannot use the tube lens that is provided by Olympus, as the mechanical design does not fit and at the same time I want to use a smaller focal length than what is provided there (the Olympus tube lenses have 180 mm focal length). I tried an achromate with f = 100 mm and about half the diameter that results in a sufficient resolution in the image center, but with increasing field value results in high aberrations (probably spherical, astigmatism, coma I think) as well as distortion, but that could be corrected via software.
My next step would be either to look for different lens systems that I could use as a replacement here, or to design one by myself and let it be manufactured.
My question now would be, if anyone knows suppliers of lens systems, that I could use here as the tube lens, and that would provide better correction of off axis aberrations than achromatic doublets. I suspect Hastings triplets could help here, but I checked Thorlabs, Edmund Optics and Newport and the triplets there have focal lengths that are too short for my application.
If there aren't any suppliers for these, do you instead know of a manufacturer that would produce triplets based on my own design (I am located in Europe)?
Thank you so much for any input.
I have posted on this sub twice and i havent been able to confidently say what magnification i was using because i am not sure if my electronic eyepiece provides additional magnification. I am using the camera that came with my Bresser Biolux NV microscope.
Hello scientists, I'm an early career optical engineer and am wondering what are the design criteria differences between a condenser lens and objective lens? I've noticed that they can have similar NA yet objectives cost considerably more, what is the difference? What metrics differentiate an okay versus a great condenser lens? Cheers and thanks for your wisdom
Hello everyone! So i have been interested in typology for a while now. I feel as if i have a very good understanding of the cognitive functions and how they present themselves in people, as i have put a lot of time into studying them. My problem, however, comes in typing myself. I feel as if I am quiet skeptical that any judgements about myself are objective, and that they may be altered through the lens in which i see myself. When judging myself to try and find my type, i do try to be as objective as possible, but it seems impossible to tell if i really am. I mean, how is it even possible to judge ones own objectivity towards themself? That seems like an almost impossible feat. I have typed as an intp for a bit, but i am having doubts about it again. I feel like i really struggle to know myself, making it all the more difficult. if anyone has any tips or suggestions, comment them below :)
Hello ladies, gentlemen, and empty water bottles sitting on your desk. I am in need of a red dot for my gas tube rail. I've had the vortex crossfire red dot on there and it's just too small of an objective lens and the walls are too thick. Also, what size allen key do I need for this cnc warrior brace? Nothing I have fits.
Hello,
I have a brass telescope or spyglass that belonged to my great grandfather, a sailor in the British merchant marine.
The objective is missing - probably due to me playing with it as a child. It's too late to tell myself to leave it alone. I'd like to see if I can find a replacement lens before passing the telescope on to a family member.
Diameter of the lens is about 47mm. I can probably work out the approximate focal length based on the length the telescope needs to be extended with a stronger lens I recently bought on ebay.
Do you have any suggestions how I might go about finding a suitable lens that I can mount in the telescope? Is this something a helpful optician will be able to help me with or will I need to work directly with some sort of lab?
There's also a threaded ring missing that is supposed to hold the objective in place. I have less hope of finding a good replacement for that unless I have something machined, so I may resort to hot glue or silicone to hold the lens in place.
Finally: the besides the objective and the eyepiece, there is a third lens mounted at a fixed distance from the eyepiece, approximately 11". Am I right to think this is probably a concave lens to address chromatic aberration?
Thank you.
I'm hoping one of you guys knows something about collimation
I've done some reading up on how to go about collimating night vision and optical devices in general. From what I've seen people adjust the ocular lens or the objective lens to shift how the optic offsets the image the user sees. It's usually mentioned somewhere that it's often impossible to get perfect collimation with another NVD or the users other eye. I get that the lenses are mounted eccentrically and rotating the lens will essentially move the perceived image in a fixed circular path. But wouldn't it be possible to use both the ocular and objective lens to get the image to sit exactly where you need it to? kind of like how the path of the end of a double pendulum can be in any position within its reach, like in the picture. Am I missing something? I feel like there must be a reason people don't do this.
https://preview.redd.it/lv962qh18ld61.png?width=600&format=png&auto=webp&s=def8a3df6e99d75fd90c005cbd35ed034aefc760
Hello
Some background is our senior design group is constructing a microscope and we are having issues with our 40x zoom objective lens. The problem is that it won’t provide a zoomed view at all. Our eye piece of 10x zoom provides a more zoomed in view than the 40x objective. I’m kinda perplexed here and kinda wondering if we are doing someing wrong or if we got a faulty part. Any help would be amazing!
