A Question of Electronic Live Image Magnification

Click For Summary

Discussion Overview

The discussion revolves around the concept of magnification in digital microscopes, particularly how it is defined when images are displayed on monitors of varying sizes. Participants explore the differences between optical and digital magnification and the implications of these distinctions on perceived image quality.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions how to define magnification strength when images can be displayed on monitors of different sizes, suggesting that a magnification of x100 may appear different depending on the monitor size.
  • Another participant proposes that there may be confusion between optical magnification and digital magnification, noting that increasing the size of the monitor does not change the optical resolution of the image.
  • A participant acknowledges their approach of mixing optical and digital magnification and considers the need to refine their understanding of "optical magnification."
  • One participant introduces the concept of "usable magnification," discussing the limitations of optical systems driven by diffraction and the trade-offs involved in achieving effective magnification.
  • Concerns are raised about the potential for misleading magnification claims when using inappropriate eyepieces or setups, emphasizing the importance of optimizing each component of the optical system.

Areas of Agreement / Disagreement

Participants express differing views on the definitions and implications of optical versus digital magnification, indicating that multiple competing perspectives remain without a clear consensus.

Contextual Notes

Limitations in understanding may arise from the dependence on definitions of magnification and the inherent challenges in optical system design, including diffraction effects and the role of various components in achieving effective imaging.

BigDon
Messages
74
Reaction score
97
I have a difficult to articulate question about digital microscopes. I was reminded by my post in the STEM toys thread when I mentioned the Eyeclops.

How does one define what strength something is magnified at when you can cast the live image onto monitors of various sizes?

An image magnified x100, but broadcast to a monitor 3.5 feet across, is considerably more than x100.

What am I missing here?
 
Computer science news on Phys.org
BigDon said:
How does one define what strength something is magnified at when you can cast the live image onto monitors of various sizes?
Maybe you are confusing and/or mixing optical magnification with digital magnification?

E.g. if you have an image that is optically magnified x100, and you increase only the size of the digital monitor that is displaying it, you are essentially only digitally magnifying the image. The actual "optical" resolution of the image won't change.
 
  • Like
Likes   Reactions: berkeman and BigDon
That's pretty much exactly what I'm doing.

So I need to work on the definition of "optical magnification" then?
 
This question is not limited to the digital age. In some ways digital makes it easier to think about. There have always been fundamental limitations on "acuity" of an optical system that are driven by diffraction...if one tries to image a point source of light it will show up in the image plane as a diffraction disc depending upon the aperture. Also no real lens can perfectly project an actual image except for a pinhole lens of zero size: these don't allow much light to pass through! Impossible even in theory
So it is always a trade off. And absent a huge digital monitor I can still put an inappropriate eyepiece on a telescope/microscope and advertise a huge and useless magnification. (Look at how big the blur is!)
The name of the game is to optimize each piece of the system to the desired level. That way provides the best return for time and money. and requires some nontrivial understanding.

The term of art is "usable magnification"

.
 
  • Like
Likes   Reactions: BillTre and BigDon

Similar threads

  • · Replies 226 ·
8
Replies
226
Views
16K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 5 ·
Replies
5
Views
3K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 8 ·
Replies
8
Views
1K
  • · Replies 16 ·
Replies
16
Views
6K
  • · Replies 25 ·
Replies
25
Views
6K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 1 ·
Replies
1
Views
5K