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by Jakub

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22

Using live preview means that the camera must be held out in front of the photographer... This is not inherently an especially stable way to hold a camera- especially if the photographer has to hold it that way for a while- because it offers very little additional support for the arms... Pulling the camera up close and using a viewfinder allows the ...


15

Many confused answers here... Eruditass got it right, it's all about the viewfinder. Actually it's mostly the "ground" glass, which is not a ground glass anymore: it's a microstructured glass, optimized for light transmission with slow lenses, not for ease of manual focusing. Something a bit like a Fresnel lens. The eyesight, has nothing to do with this ...


11

The original advantage of thru the lens view was that it provided an exact view of precisely the image that would be exposed on the film or sensor. Not an aproximation, but the same view, because you were looking thru the lens. Some earlier cameras offered EVF, or electronic viewfinders. These had the advantage of showing what the sensor was 'seeing'. But ...


10

Olympus made the VF-1 optical viewfinder to match its 17mm lens when it released the EP-1. Apart from that, I believe all other accessory viewfinders are actually made for the rangefinder market, and are all designed to match particular focal lengths on 35mm film; you'll have to adjust for the crop factors of EVIL cameras (2.0 for µ4/3, 1.5 for the newer ...


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 ...


5

A couple of things I'd like to add to other answers: In scenes with fast action, an EVF or LV will always have a slight lag behind reality, which is bad when you want to nail a certain moment (using the other eye as an optical input may help, though the delay between two eyes might give you a headache soon). On the other hand, Live View is a handy tool ...


4

The biggest drawback in my opinion is the shutter lag. There is generally a delay in the shutter activating when you use live preview.


4

It's to do with the focussing screen, however I don't profess to completely understand all of the effects you mentioned. The focussing screen in modern DSLRs is made of laser etched glass in order to facilitate manual focussing and transmit as much light as possible for slow lenses. With old fashioned ground glass screens, the micro-structure of the glass ...


4

"95% accurate" - there isn't such an optical viewfinder. IOW there isn't an optical viewfinder which will give you guaranteed the final result with at least 95% accuracy. Most probably you mean 95% coverage - this means that you see through your viewfinder only 95% from your photo area. So, it is nothing related to the bokeh. Speaking simply, as we all ...


3

As with any lens on a dSLR, the viewfinder and liveview will show you any lens effects. The lightpath into the camera travels through the lens first before it is reflected by the mirror up into the viewfinder, or (in liveview as the mirror is locked up) before it hits the sensor to be turned into image signals that are sent to the LCD. So however the lens ...


3

On an SLR, since the image is transmitted by the attached lens regardless of whether you use the optical viewfinder or live view, both live view and the optical viewfinder will show what the sensor sees, including the effect of any filters or modifiers attached to the lens. Indeed, live view is a feed directly from the sensor. Not all viewfinders offer 100% ...


3

I have a similar problem with my astrophotography setup in that sometimes it's difficult to see where I have my piggyback camera pointed in the sky. In stargazing circles, there are "unity" finders which are basically a piece of glass on which a dot is projected, allowing the user to orient the view at the sky with no magnification. These are called reflex ...


2

Aside from the Leica Ms, there is one very notable MILC with an optical viewfinder, which is the Fuji X‑Pro 1. Its fixed-lens little brothers, the X100 series of cameras, also sport the same "hybrid" viewfinder which can be switched between an OVF with LCD overlay and an EVF and APS-C sensors. And unlike the X-Pro 1 have leaf shutters that ...


2

You probably can, and a Canon service centre would be able to do it, but it would be worth weighing up the cost, if it's in the optical viewfinder, then it won't affect any images because the mirror that is behind the lens that passes the image to it gets raised when the image is captured to send the light coming in through the lens onto the image sensor ...


1

You can get some general figures in the 60–80% range by looking up transmission rates of materials like frosted glass. DSLRs often use laser-etched glass that may have higher transmission. But a camera is not like a set of binoculars. A DSLR lens focuses light onto the focusing screen (when the reflex mirror is down), and the viewfinder flips the image ...


1

The question would be why is it taking a long time when using the optical viewfinder. Different metering is used for optical (using the metering sensor) since the mirror is down vs direct measurement using the CMOS sensor when the mirror is up (LiveView). Something may be wrong with your metering sensor. First I'd check to make sure your metering settings ...


1

I notice two different possible things as I look in mine. The first is a reflection off the focusing LCD (normally a focusing screen, but in the 5Dm3 and 1Dx, they put in an actual see through LCD so that you can change the viewfinder image. The image on this looks like an inversion of what I normally see through the viewfinder. This can also be ...


1

The optical viewfinder does not require any power. Take a look at the numbers in the "battery" section of each of the following links (at the very end of the article): http://www.imaging-resource.com/PRODS/canon-5d-mkiii/canon-5d-mkiiiA6.HTM http://www.imaging-resource.com/PRODS/canon-t5/canon-t5A6.HTM ...


1

re: Why anyone would want to hold even the lightest camera out at arm's length baffles me. Some people, it seems, can't envision the boundaries of the frame when looking through the classic eyepiece. That's probably because the eye is not a direct percepion; rather a mental image is built up. I recall being impressed that my 3-year-old nephew could ...


1

Mirrorless cameras are mutually exclusive with through-the-lens optical viewfinders, by definition. If your camera is mirrorless, it's not possible to add an optical viewfinder that sees through the lens. The only way to add an optical viewfinder is have it separate to the main lens, with its own lens. This is the same principle as on rangefinder cameras, ...


1

I have the 550D (T2i) which is close to the 500D in many ways. I do not find it credible that the viewfinder could substantially alter the depth of field unless somehow it is managing to refocus the out-of-focus areas and I doubt it's capable of that. As a check, I took a look at items in my office through an f/2.8 17-55 mm lens and was readily able to ...


1

Today's viewfinders are designed to have better light transmission at the expense of diffusion. This is because autofocus cameras use a semi-transparent main reflex mirror so part of the light passes through the mirror and to a secondary mirror that is reflected down to the AF sensors at the bottom of the camera. In addition, many cheaper cameras use a ...


1

The mirror box assembly and necessary registration distance for an optical TTL viewfinder makes it nearly impossible to be compact. You'll have to live with pancakes (Pentax makes a great trio: DA40, DA21, and DA70) If you can live with a non TTL optical viewfinder, there are rangefinders. I hear some EVFs are actually pretty good, even in low light. ...


1

There actually still are a few viewfinder cameras with exchangeable lenses. The Leica M9 seems nice.



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