15

On a reflex camera (those with a mirror allowing you to compose and focus through the same lens that you will shoot the picture - aka SLR or DSLR) the focussing screen is a glass surface on which the image is projected by the mirror. You can see it by removing the lens and looking inside the body above the mirror: When looking into the viewfinder you see ...


12

Actually, the default screen is imprecise. With the advent of autofocus, modern viewfinder screens are designed to be bright even with slow lenses, at the cost of not really showing the difference in focus at fast apertures. With the "imprecise" screen, it's hard to see the exact, "critical" focus needed for fast lenses. But autofocus doesn't care, so if ...


12

What you are showing isn't just a focusing screen. It is a focusing screen with two special focusing aids. First, it has a split prism, which works as a tiny rangefinder — when the two sides are aligned, the subject is in focus. Second, outside of that, the rough microprism ring gives a similar effect, with a different tradeoff between ease of focus and ...


8

Well, first I should mention that dust on the focusing screen has no effect on the image quality or the exposure metering, so for that sake there is no need to clean it. On the other hand the dust may get loose and get onto the sensor, so it's a good preventive measure tog get the worst dust away at least. To clean it, you should first turn the camera off, ...


8

Two things contribute to this phenomenon: The light collected by split image focusing screens are edge rays collected on the outer areas of the front element of the lens. With lenses that have smaller maximum apertures the focusing screen is trying to find light from an area wider than the front element of the lens. In most situations focusing and metering ...


7

It sounds like you're observing the laser etched glass focussing screen. A focusing screen requires a rough surface so an image can be formed for you to view through the viewfinder. Ground glass used to be used for this purpose but now glass etched in a circular pattern with a laser is used, to improve the brightness of the viewfinder when used with slower ...


6

That's a 'focusing screen'. You can easily obtain it either from the manufacturer directly, or from a camera store. For example from Adorama Typically, for one model of camera there will be a few types of focusing screens that work with it. Your camera's manual will tell you which one has been installed by default, and which ones you can substitute for ...


6

You'll find most split-circle focusing screens in manual focus film SLRs. In these cameras, the mirror is very efficient, and reflects all of the light up into the viewfinder. A little gets diverted for the exposure metering, but most of the light goes up and hits the focus screen. On autofocusing cameras the mirror is less efficient, as part of the light ...


6

These focusing aids are part of the focusing screen, which is part of the viewing system within the camera body. Some cameras have user-interchangeable focusing screens, others have factory-interchangeable focusing screens, and some cameras have focusing screens that cannot be changed. See for example Canon's leaflet on focusing screens here: https://www....


5

The physics... The ground glass (or plastic) screen acts as a diffuser, scattering light passing through it randomly rather than simply letting it pass through unaffected. An image can be brought to focus on the screen by adjusting the lens, and the image we perceive comes from scattered light that is traveling in the precise direction of our retinas. The ...


5

You can register a frequently-used AF point to the camera. You can then use the Custom Controls menu to select either the 'Depth of Field' button or the lens' 'AF Stop' button (if the lens is so equipped - only Canon's Super Telephoto series of lenses have an 'AF Stop' button on the lens) to act as the [Switch to registered AF point] button. From page 108 ...


4

You are looking for an HDMI monitor. Here you go, BHPHoto has 116 results for that.


4

The ground glass, or focusing screen, is, in the simplest case, literally just a piece of glass that has been ground, so one of its sides has a rough/matte surface (see also the article Ground glass on Wikipedia. It's actually quite easy (at least for large format cameras) to make ground glass yourself, see this how-to for example. The ground glass just ...


4

Sounds to me like you've never actually used a different focus screen on your 6D, and you're obsessing about something you've read online. Just get the super-precision matte screen (Eg-S). I've adapted manual focus lenses to both my 5DMkII and 50D--both of which have the same interchangeable focus screen feature your 6D does. Swapping the focus screen is ...


3

A scratch on the focusing screen won't affect Auto Focus at all, since the light used for AF, whether phase detection or contrast detection, doesn't pass through the focusing screen. It will only affect what you see through the viewfinder. If severe enough it might affect metering, which does use light that passes through the focusing screen. But a single ...


3

According to Canon USA's online support page (see the note below), the only focusing screen compatible with the Canon EOS 6D is the one supplied with it, the Eg-A II. Also according to Canon USA's online support page, the focusing screens available for the Canon EOS 5D II are only compatible with the 5D II. However, according to page 312 of the EOS 6D ...


3

I would suggest rather than drawing directly on the ground glass focusing screen that you use a piece of clear laminate material to draw on. If you draw your desired lines onto paper, tape the plastic over the paper then trace your markings onto the laminate, you can try several different options depending on what you need. Once you find the perfect ...


3

The great news is that you have not damaged anything, this is normal. The screen fits between the prism and the sensors and so it will affect something. Using KatzEye screens as an example because I have personal experience on two Nikons, each has good notes on what kind of metering changes you will experience. Mostly your exposure will change by a ...


3

It can and it does. The metering sensors are placed up in the top of the prism housing, in other words it reads the light AFTER the light has passed through the focusing screen. If you are using a camera that is designed to have different mattes replaced (bad news: You are not) and the screen is one the camera is designed for, the necessary adjustments that ...


3

I'm not exactly sure what you mean, I am guessing that by 180 you mean a single split, perhaps horizontally framed and the double 45 is really an X shaped dual split. The reason that the old SLRs had so many different screens is that its very much a personal preference, there is no one answer, it varies by photographer by what they are shooting. I ...


3

You can always remove the focusing screen then puff some air on it with a blower or whatever. Here's a website with instructions on how to remove the focus screen. http://www.focusingscreen.com/work/550den.htm You may simply end up with more dust though. Who knows. Good luck!


3

If the focusing aid was part of the lens, it would be visible in the image. That's because they are optical elements themselves, which means they change the properties of the light that goes through them in order to work. But you do not want them to be visible in the frame (neither film nor digital). The path of light goes always trough the lens and then ...


3

It seems that f/4 lens can get a bit too dark using Canon Eg-S screen. On this forum, one user said: I tried 24-105 f/4L and for indoor uses or outdoors at evening I believe VF is too dark. It's still usable but the VF is really much darker than with standard focusing screen Perhaps, better question would be: I have f/5.6 manual lens and would like to ...


3

An off-center split prism should work fine to assist manual focusing at the spot it's located. Lens resolution tends to drop off toward the edges. So the farther off-center the focus point, the lower the resolution at which you'll be able to focus. You can still fallback on autofocus if your lens supports it because the autofocus sensor is behind the mirror ...


2

Take it to a repair shop. Nine times out of ten you make it worse when trying to fix these kind of things at home.


2

I extremely recommend the grid focusing screen. EG-D I think it is. I cannot live without a grid focusing screen. http://www.bhphotovideo.com/c/product/590409-REG/Canon_3356B001_Eg_D_Precision_Matte_Focusing.html Having those lines in my view finder means I can arrange people in a shot better and I can also line up lines in the architecture, etc, and I can ...


2

Focusing screens for cameras with autofocus tend to be - almost per definition - optimized for use with autofocus lenses, which tend to be relatively "slow" with an aperture in the f/3.5-5.6 range. In olden days, focusing screens were optimized for fast, manual-focus screens, but those screens had the downside that they grew unusably dark when used with such ...


2

My experience with Nikon bodies is that each body takes a slightly different shaped focusing screen. Even the second link in your question points out that there are different screens for the F4 and F5 bodies. You'll need to make sure you're getting a screen specifically for your model of camera.


2

Simple answer: yes. Inexpensive option: 'Bresson'. Here's a review. I have one for my 5100.


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