How doestheeyepiece compare tothe objective lens

The key point here is that since the smaller sensor will crop what the lens sees, one will have to use a short focal length to obtain the same angle of view. Therefore, an image taken with the shorter focal length on an APS-C will have more distortion than the same scene taken at the same distance with a longer lens on a FF sensor. To prove or disprove this for yourself, take a photo with your phone, then zoom your lens on your digital camera so that the angle of view match. Then compare the two photos.

Low powerobjective lens

Leica apochromats are objectives for applications with highest specifications in the visual range and beyond, offering field flatness up to 25 mm. The absolute values of the focus differences for the red wavelength and the blue wavelength to green wavelength (3 colors) are ≤ 1.0 x depth of field of the objective.

The reason is only because most if not all distortion happens on the edges of the lens glass. Using a cropped sensor is indeed

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3 types ofobjectivelenses

The only thing that changes is the field of view when you use a cropped sensor. But the angle of view is what causes the distortion. And it remains the same for a lens irrespective of the cropped factor.

What is the10xobjective lenscalled

The size of the sensor does not change the perspective. The perspective is only affected by the distance between the lens and the subject no matter its focal length.

The optics of the most basic microscope includes an objective lens and ocular or eyepiece. The objective lens is closest to the sample, specimen, or object being observed with the microscope (see the schematic diagram below). For more information, refer to the article: Optical Microscopes – Some Basics Show schematic diagram

The objective lens of a microscope forms a magnified, real, intermediate image of the sample or specimen which is then magnified further by the eyepieces or oculars and observed by the user as a virtual image. When a camera is used to observe the sample, then a phototube lens is installed after the objective in addition to, or even in place of, the eyepieces. The phototube lens forms a real image of the sample onto the camera sensor. The objective’s numerical aperture (NA), its ability to gather light, largely determines the microscope’s resolution or resolving power to distinguish fine details of the sample. Also, the working distance, the distance between the sample and objective, and the depth of field, the depth of the space in the field of view within which the sample can be moved without noticeable loss of image sharpness, both greatly depend on the properties of the objective lens. For more information, refer to: Collecting Light: The Importance of Numerical Aperture in Microscopy, How Sharp Images Are Formed, & Optical Microscopes – Some Basics & Labeling of Objectives

Objective lens microscopefunction

My initial thought is "no" given that my idea of how a cropped sensor works is like printing off a 8x10 picture and then cutting out the 4x6 that I like: the picture doesn't change, only my view of it.

Leica achromats are powerful objectives for standard applications in the visual spectral range, offering field flatness (OFN) up to 25 mm. The absolute value of the focus differences between red wavelength and blue wavelength (2 colors) is ≤ 2x depth of field of the objective.

What is the4xobjective lenscalled

All Leica objectives are marked with codes and labels. These identify the objective, its most important optical performance properties, and the main applications it can be used for. For more information, refer to: Labeling of Objectives

What changes is perspective. It's not lens distortion (barrel distortion) that makes wide-angle closeups unflattering, it's how close you need to get to the subject to fill the frame. For a given focal length lens, you need to be closer to fill the frame using a full-frame camera than you do with a crop-sensor camera. That means that, proportionally, the nose, say, is going to be much nearer the camera than the eyes with a full frame than with a crop sensor, and the ears will be off in the (comparatively) far distance.

There was recently a video posted about how different focal lengths affect portrait photography, specifically how distortion at smaller focal lengths have more distortion and are less flattering.

High powerobjective microscopefunction

For standard applications, Leica Microsystems offers an extensive range of top-class microscope objectives. There are also Leica objectives which have been optimized for special applications. The highest-performance Leica objectives feature maximum correction and optical efficiency and have won several awards. All over the world, scientists are relying on Leica microscope objectives to gain insights into their area of research.

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Whatarethe3objectivelenseson a microscope

That's actually exactly right, and the only key part you're missing is that that changing your view of the picture by cropping off the edges is exactly what you're doing by zooming in.

Leica semi-apochromats are objectives for applications in the visual spectral range with higher specifications, offering field flatness up to 25 mm. The absolute values of the focus differences for the red wavelength and the blue wavelength to green wavelength (3 colors) are ≤ 2.5x depth of field of the objective.

... a cropped sensor works [...] like printing off a 8x10 picture and then cutting out the 4x6 that I like: the picture doesn't change, only my view of it.

Leica microscope objective lenses are designed and made by our optics specialists to have the highest performance with a minimum of aberrations. The objectives help to deliver superior microscope image quality for many applications, such as life science and materials research, industrial quality control and failure analysis, and medical and surgical imaging.

As a matter of a fact should one take an exposure with a 200mm lens and then from the same location take the same exposure with a 20mm lens the perspective will be the same. What changes is the amount of information you will see in the 2 exposures. Crop the 20mm lens exposure to match the same field of view of the 200mm lens and you will see the perspectives are identical. The same logic goes for cropped sensor. a 50mm lens on a cropped sensor might have a FOV of a 75mm lens on a full frame body but the perspective remains unchanged nonetheless.

This type of distortion isn't really a lens artifact. It's the actual, real perspective distortion there in the world. You just don't notice it when looking with your eyes, because your brain is actually doing the seeing, and it spends rather a lot of processing power glossing over things like this and using memory, pattern recognition, and of course stereo vision to build on an impression of a three-d world. Even when you try to sit very still and be mindful of the exact way the scene looks, your brain is working hard to foil you. (This is one of several areas where a drawing class could be very beneficial to a photographer!)

So the question is that, because we always talk about how Canon's cropped sensors have a 1.6x crop factor so the lenses are essentially longer, does the distortion caused by the lens change when used on a cropped sensor?

However, if distortion is least prominent at the center of the photo and most prominent at the edges, then the perception of the net effect of the distortion would be changed by using a cropped sensor and I get confused again.

When you project an image through a lens onto a flat sensor, though, the light rays are all frozen, and perspective distortion can be very clear in a way that's jarring to, well, people used to looking at the real world. When you crop or use a longer, tighter focal length, you flatten that out.

Do you need an individual objective for your application? Then contact our Leica OEM Optic Center so that we can offer you a customized solution.