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 ...


7

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....


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 ...


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 ...


5

Every Canon camera I've ever seen that has a user replaceable focusing screen has the large tab, intended as the point of contact for the custom tool Canon supplies with all replacement screens, on the right as you look through the throat of the light box. This is confirmed in this video from the Canon Professional Network. If the focusing screen you removed ...


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

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

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

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

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

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 ...


3

Your focus screen fell out with its' metal carrier ring attached? If that is actually the case then the focus screen cannot be replaced w/o a major service... it will almost certainly be cheaper to replace it buying used. But I do not see any reason that you could not use it via live-view photography (LCD screen). It sounds like that is how you normally use ...


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

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.


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

There are generally three main different types of focusing screens: Split circle with a prism collar Matte Gridded And umpteen variants of each of these. But the first type was more common in film dSLRs and were to aid manual focus. The "split" in the middle would show you how far out of focus you were, and as you adjusted focus, the two sides of the ...


2

It is true that for a camera with a 23mm lens and crop factor 1.52 (inferring from your 35mm) that at f/8 the hyperfocal distance is a little over 10 feet (closer to 11 actually). "Is it correct" is not the question you should be asking though. What do you want from your photos? Do you actually want to get the whole scene in focus from 5 feet beyond? Will ...


2

This is probably opinion-based, but in my personal experience, hands-down, the focus screen is the way to go. I've used AF-confirm chipped adapter rings with manual lenses, and I've also swapped out my 5DMkII's focus screen for the Super-Precision matte focus screen (Eg-s) and swapped out my 50D's focus screen for a KatzEye. In my humble estimation, the ...


2

I went to a camera store today and looked through the viewfinder of their floor model using my same 180 mm f/3.5 lens. I was able to see the same little donuts at the center of the defocused highlights. Also, I have posted my question in the dpreview forum, and one person affirmed seeing the same thing. Although it constitutes a pretty small sample size, I'...


2

There are three things you should inspect, mirror focus screen and viewfinder. Check this link, to clean your DSLR You view is blurry because you need to Calibrat the Diopter on Your Camera While doing this, start to adjust your viewfinder. As you dial in the + or -, you'll start to see the focusing points become either blurry or sharper. - When you ...


2

Changing the size of the focusing screen is not reasonably possible. jarnbjo explains why the focusing screen is the same size as the film format: The focusing screen is always the same distance from the lens as the film you are intending to expose, otherwise you could not use it to focus. It is therefore also the same size as the film format... The size ...


1

Although I can't recall ever seeing it officially confirmed by Canon, I think the general wisdom back in the day was that the laser-matte screens with a Roman numeral in the name worked better at C.Fn-0 setting of '1', while those without any Roman numerals did better with C.Fn-0 set to '0' when used on cameras introduced before the specific screen in ...


1

Is there any way to forgo the autofocus points in my viewfinder? Perhaps replace the second piece of glass with a blank one? You would need to replace the piece in question with another piece that is both the same thickness and has the same refractive index. You need the former so that the surface of the focusing screen remains equidistant from the lens as ...


1

Many EOS cameras have a menu or custom function option regarding when AF points light up in the viewfinder and when they don't. The default setting is "automatic", which means they light up in darker situations and don't light up in brighter situations. The other two options are normally "always on" and "always off". It may be possible you've changed this ...


1

The "donut" bokeh you are seeing in the viewfinder is probably related to the way the reflex mirror is made in modern DSLRs. The center of the mirror is not as reflective as the outer edges are. This is to allow some of the light in the middle to pass through the primary mirror and bounce off the secondary mirror into the Phase Detection Auto Focus array ...


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