14 Millimeters to Inches | 14 mm to in - 14.4mm to inches

 2024-06-24 09:56:27

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Abstract: Purpose: This article introduces the Pentacam® Cornea OCT (optical coherence tomography). This advanced corneal imaging system combines rotating ultra-high-resolution spectral domain OCT with sub- 2-micron axial resolution and Scheimpflug photography. The purpose of this study is to present the first experience with the instrument and its potential for corneal diagnostics, including optical biopsy. Methods: In this prospective study, the Pentacam® Cornea OCT was used to image the corneas of seven patients. The novel wide-angle pericentric scan system enables optimal OCT imaging performance for the corneal layer structure over the entire width of the cornea, including the limbal regions. A detailed analysis of the resulting images assessed the synergism between the OCT and Scheimpflug photography. Results: The Pentacam® Cornea OCT demonstrated significantly improved image resolution and ability to individualize corneal layers with high quality. There is a synergism between the OCT high-definition signal to individualize details on the cornea and Scheimpflug photography to detect and quantify corneal scattering. The noncontact exam was proven safe, user-friendly, and effective for enabling optical biopsy. Conclusions: Pentacam® Cornea OCT is an advancement in corneal imaging technology. The ultra-high-resolution spectral domain OCT and Scheimpflug photography provide unprecedented detail and resolution, enabling optical biopsy and improving the understanding of corneal pathology. Further studies are necessary to compare and analyze the tomographic reconstructions of the cornea with the different wavelengths, which may provide helpful information for diagnosing and managing corneal diseases. Keywords: Pentacam® Cornea OCT; spectral domain; cornea diseases; cornea ectasia

If I took a 35mm lens and popped that onto a crop fame camera, it's going to look more “zoomed in” than it would on a full frame camera.

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But if you are new to photography, the chances are you're NOT shooting with a full frame camera. You probably have a crop frame camera and that gives a world of difference on to how your lenses are actually going to perform!

What does mm mean for lenscanon

So the photographer in the same position for both of these images. One was taken with a 35 and you can see, we can see more in the frame. For the one that was taken with the 85mm, you can see that everything seems more zoomed in, it's pulled closer to the frame.

So for example, if you were using a 35mm lens on a crop frame camera, you're going to take 35 - that's the focal length of the lens - and then you're going to multiply that by 1.5 if you use Canon or 1.6 if you use Nikon.

So if you forget about having a lens there for a moment and you're just looking at a scene, roughly speaking, if you put a 50mm lens onto your full frame camera, it is going to give you roughly the same field of view.Now it's not exact, but it's kind of close enough.

So that’s focal length explained - but how can we tell just by looking at the focal length number how that lens is going to perform on our camera?

What that simply means is if you zoom in, you are going to get a different maximum aperture than if you zoomed all the way out.

What does mm mean for lensphotography

Psssst! Don’t forget to grab your Which Lens Kickstarter guide underneath the video - it will take the video to a whole new level :-)

Now this number refers to the focal length, which is simply how much off the scene you are going to be able to see when you look through the viewfinder. A larger number will give you a telephoto view, which simply means that when you look through the view finder, everything will seem closer to you than it would the naked eye.

What you need to do is take the focal length of the lens, and then multiply that by a number. That number is either going to be 1.6 if you use Canon or 1.5 if you use Nikon.

So any LARGER larger than 50 mm, so for example, 85mm, 135mm, 200mm, they are going to give you a more zoomed in look. The larger the number, the more zoomed in it's going to appear.

Ambrósio Jr., R.; Esporcatte, L.P.G.; de Carvalho, K.A.; Salomão, M.Q.; Pereira-Souza, A.L.; Lopes, B.T.; Machado, A.P.; Marschall, S. Combined Rotating Ultra-High-Resolution Spectral Domain OCT and Scheimpflug Imaging for In Vivo Corneal Optical Biopsy. Diagnostics 2024, 14, 1455. https://doi.org/10.3390/diagnostics14131455

Whatis focal length oflens

If you’ve been asking yourself that question then you are in the perfect place, as today we’re going to be talking about what all the numbers on your camera lens means, and how you can use this information to decide which lens might be best for you.

Cameralens mmchart

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That's because you have a different sensor size and it magnifies the scene. So you can take this exact same 85mm lens, but pop that on to a crop frame camera, then it's going to behave differently.

What does mm mean for lensnikon

Ambrósio Jr., Renato, Louise Pellegrino G. Esporcatte, Karolyna Andrade de Carvalho, Marcella Q. Salomão, Amanda Luiza Pereira-Souza, Bernardo T. Lopes, Aydano P. Machado, and Sebastian Marschall. 2024. "Combined Rotating Ultra-High-Resolution Spectral Domain OCT and Scheimpflug Imaging for In Vivo Corneal Optical Biopsy" Diagnostics 14, no. 13: 1455. https://doi.org/10.3390/diagnostics14131455

And if you're using a crop frame camera, tell me what the equivalent focal length is and let me know what your maximum aperture is - It's a great little exercise just to make sure that you understand everything we’ve spoken about today!

That’s it from me today, I hope that this answered your question about what all the numbers on a camera lens actually mean, and how you can use this information to see which lens is right for you!

Cameralensdistance chart

So that was just with one focal length. But you may have a zoom Lens, in which case you're going to have two different numbers separated to by a dash.

Ambrósio Jr. R, Esporcatte LPG, de Carvalho KA, Salomão MQ, Pereira-Souza AL, Lopes BT, Machado AP, Marschall S. Combined Rotating Ultra-High-Resolution Spectral Domain OCT and Scheimpflug Imaging for In Vivo Corneal Optical Biopsy. Diagnostics. 2024; 14(13):1455. https://doi.org/10.3390/diagnostics14131455

Now the aperture number is normally just written along the side or on the rim of your lens, and you'll see that it's got 1: 1.8 on lens below on the left, meaning that it has a maximum aperture of F1.8.

What does mm mean for lensreddit

Now here is an example of that for you. So here is an example of an image taken with a 35mm lens, and then one with an 85 mm lens on the same camera.

Focal length oflensformula

Now I've actually got an extra little freebie for you that I think you'll love and will totally help to put all of this into perspective of how each lens will perform and what it can be used for. It’s my FREE Which Lens Kickstarter guide, and in that you'll get loads of image examples using different focal lengths so you can see what each one brings to the table. Plus you'll get some suggestions on which best lenses or focal lens you can use for different types of shots! Totally free and totally worth it. Go here to grab your copy!

Now on some lenses you will actually see that you have two aperture numbers, and what that means is that you have a variable aperture lens. You'll normally find that on your zoom lenses.

So here's what I'd like you to do now. Go and grab your lens (or have a look at the one online if you haven't got one yet) and in the comments below, let me know what the focal length is.

So I do want you to bear that in mind when people are talking about focal length of lenses. If you have a crop frame camera, remember to do that multiplication by 1.5 or 1.6, and that will show you how how that particular lens focal length is going to perform on your camera.

So let's take that 85mm and we're going to multiply that by 1.6 (let's assume that we have a Canon!) and that's going to give us an equivalent focal length of 136.

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So when you just have the one number, for example, an 85, it's got one fixed focal length. If you want to get closer or further back, you'd go and have to move your feet! It's fixed at that focal lens.

So if you've been looking at lenses online, or maybe you already have your lens and you just don't understand what all these numbers actually mean, stick around. as by the end of this post, you'll know exactly what the numbers mean and you'll know how your lens is going to perform!

However your Zoom Lens, because it has that two numbers, means you can move the zoom ring to zoom in and zoom out and you can go through that whole range of focal lengths.

Now if I look again on my Zoom Lens (the image on the right) the 16 to 35mm, you can see it's got 1 and then it's got 2.8. So the maximum aperture of this lens is F2.8.

On the other hand, if you have a number that is LESS than 50mm, so 35mm, 24mm or 16mm, then that is going to give you a view that is wider than the naked eye.

A smaller number will means you will have a wide angle lens, which means when you look through the view finder, everything will seem further away.

If you want to get an idea of how different focal lengths perform, then be sure to download my FREE which lens kickstarter guide - it has examples of images taken at different focal lenghts, along with a guide about what you might want to use each one for.