An Important Correction on Objective Upgrading!
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- Опубликовано: 25 авг 2024
- I overlooked this in my previous video and it'll be important for some of you! I do my best to provide accurate info, but sometimes I'll miss something and I'm sorry if that ever affects you. That said, my general approach to this hobby is pretty thorough, I think, and I'm always interrogating my own results and doing my best to ensure the knowledge I pass on to you all is of the highest quality!
What you have demonstrated in this video is a fundamental principle of how (most) finite microscope optics work:
Finite microscope objectives are NOT fully corrected. They still have remaining optical articats. These remaining optical flaws are corrected by the eyepiece of the microscope. What is important to know: There was no standard way of manufacturing microcope optics. Each manufacturer had different optical artifcats in their objectives. For this reason, an Objective from Olympus only works perfectly with an eyepiece from Olympus because the manfacturer designed the eyepiece to compensate the optical errors from their particular objective. The same is true for Zeiss,Leitz etc. To work like they were intended, you need to use the eyepiece that was designed for these objectives.
Nikon is a different story. Nikon relatively quickly switched their production to CF objectives (Chromatic abberation free). That means these objectives are fully corrected and don't need additional compensation from the eyepiece. The Nikon eyepieces did not compensate for any errors of the objective and were only there to magnify the image. That is the reason why your Nikon objective performs very well with the generic, non-compensating eyepiece.
Indeed! But what is really interesting is that if you pop a Nikon lens on an amateur scope with a Siedentopf head (most amateur scopes people are picking up these days), it is no longer perfectly corrected. What’s more, Olympus objectives actually start to look pretty well corrected and will look BAD if you use Olympus eyepieces! In other words, these scopes are not neutral, but apply a slight correction (incidentally). Olympus objectives require only moderate correction compared to Zeiss and they don’t require substantial flatness correction as Leitz do (based on my testing, anyway). I don’t cover all the nuances of this in my videos because I want people to take action and enjoy the hobby before getting caught up in all these optical shenanigans. (Though we will be covering the shenanigans in great detail in the future)
This scope is interesting because it’s the first amateur scope I’ve found which truly treats the light from the objective neutrally. That means, despite the somewhat outmoded head, it may function really well as a platform for using vintage optics and eyepieces to their full abilities!
You should check out the pdf I put together for the “upgrade your objectives” video! It has a lot more information. Also, if you have an amateur grade scope you can test your objectives on - I’d certainly love to hear a report on the performance!
when you say that the eyepiece does the corrections, would that mean that using a camera with finite objectives would be uncorrected? since well cameras don't use eyepieces, unless you are using eyepiece projection.
Sorry for the audio quality, but I wanted to get this one out ASAP! The PDF is updated and maybe I'll cut together a new version of the original video in the future. To the best of my knowledge, if you have an amateur scope with a Siedentopf head, you're probably okay with Olympus or Nikon. If you have a head like the one pictured here, I strongly suspect you'll get similar results as in this video.
That said, this microscope I picked up is actually super duper interesting! It may look a little familiar but I'm willing to bet none of you have ever actually seen it for sale! I'm gonna give it a full review in the near future as I think it might be one of the best options for doing high quality amateur microscopy on a budget - especially if the prospect of acquiring and/or refurbishing a BH2 is a bit daunting for you.
Let me know if you've got any questions and please get in touch if you're having issues getting good images with the new objectives you just picked up!
Diet Tom's Diatoms Hello my friend , firstly i am Clueless on Microscopes but i am going to Buy one very Soon , every time i pick one and then do more research i get put off by bad reviews lol
To be Honest I'm more interesting in how to film the Samples , it's very confusing to say the least. But i found this Guy who uses a Zoom Camera on low Magnification Objectives like x4 and then uses the Camera Zoom too Enlarge the Image , even going to x25 on his Camera.
Now this got my Interest because i would only have to Buy say 2 Quality Objectives , a x4 and a x10
The Problem i have is the Guy is very Secretive and won't tell anyone what Camera he uses. Obviously he is using Optical Zoom and not Digital Zoom on the Camera.
So could you figure out how he is Doing it for me Please.
Is he using the Macro like on a Bridge Camera where you can focus as close as 1 cm ?
I have no idea , anyway here is his Video , please take a Look
ruclips.net/video/ph7v3-BiXLc/видео.html
Can eyepiece cameras be as good as trinoc tubes + camera? One can often find better buys on binoc microscopes but I want to do photo/video work too.