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74

A picture is worth a thousand words, here. This is a Twin Lens Reflex camera: The two lenses are linked together so they focus as a set (either the whole front panel moves, or the lenses are linked by gears so that they turn together to focus). The top lens — the "viewing lens" — has a mirror which bounces the view to the ground-glass viewfinder. The bottom ...


63

Is there any significant benefit to having an SLR mechanism in a digital camera? Particularly in terms of a benefit that's large enough to make up for the liability of adding a mechanical part into a design where a solid-state alternative is available? Yes. Response speed for both autofocus and shutter release. The mirrorbox has a number of side ...


54

Single lens means that there is only one lens attached to the camera at once. This is to distinguish it from a twin-lens reflex camera, which has two lenses - one used for the viewfinder and one used for actually taking the photo.


53

And with a digital camera, you don't need a hinged mirror as you can show the user exactly what light will be captured by just routing the sensor output to an LCD display. This is the reason for the rise in popularity of mirrorless interchangeable lens cameras (MILC). Without the mirror box, the camera can be smaller, lighter, less expensive, etc. Having ...


27

Don't forget a major drawback that EVF's require power to compose, and are much harder on batteries if you spend a lot of time with the screen on. Also, as previously mentioned, because of delays, it is harder to follow moving objects with an EVF.


20

DSLRs have expanded massively is terms of features since the 70s, now your entry level DSLR has comparable AF system, speed, shutter as a pro SLR from the 90s! The D800 pictured has to incorporate many things absent from your 70s SLR tough weather sealed metal chassis pop up flash AF sensor below the reflex mirror (why the camera is taller) large battery ...


18

Yes, you can. Changing lens won't reveal the film in an SLR; both mirror and shutter are in the way. The lens mount is only meant to pass light to the film during exposure — you can see light through the lens in the viewfinder when composing, but that light doesn't reach the film.


18

You won't be able to tell by looking at the film. When the film is exposed, the changes in the crystals in the film's emulsion are invisible, and the exposed film is said to contain a latent image. This image is made visible by developing the film into negatives from which you can make prints (or for slide film, into slides). After this, a fixer is used to ...


18

It's important to realize that you don't actually look directly through the lens with an SLR! If you did, a periscope style arrangement would do just fine. What you are actually doing is looking at an image projected onto the focussing screen by the lens. This image is flipped left/right and up/down by the lens, and then up/down again by the main mirror. ...


17

There are both advantages and disadvantages to EVFs. The very best ones with high-resolution and high-refresh rates are actually quite suitable for most uses when well-implemented. The main disadvantages are: Lag: There is a short lag between action happening in front of the camera and what you see. Dynamic-Range: EVFs are small LCD screens and have ...


17

Another disadvantage of using the sensor to generate a near real time preview in lieu of an optical viewfinder is the requirement to keep the sensor energized continuously. In addition to the increased battery usage, over extended periods of time this tends to build up heat which, as we all should already know, can affect read noise and thus the signal-to-...


16

if I use the auto-focus, does it adjust the lens focus, or is there a secondary lens in the body that gets adjusted? No, there's no secondary lens. The lens attached to the camera contains a motor that moves the lens elements as required by the autofocus system. Same with the aperture settings, is this changing on the attached lens, or is there another ...


15

I suspect the major reason this is true for DSLRs is to get the lightning-fast focus times that point-and-shoot cameras don't have. The autofocus mechanism is not actually part of the main CCD/CMOS sensor, but a separate device in the camera body, and the mirror splits the light coming through your lens so that half goes to the viewfinder and half goes to ...


14

It certainly is not worth investing in a 35mm film camera for the perceived higher resolution, additional color, or sharpness. To get results you will likely have to either invest in, or at least have access to a drum scanner that gives you the highest resolution possible right now. Otherwise you will likely be scanning on a flatbed that almost certainly ...


14

This is a great camera with a lot of advantages for a beginner. It's dead simple and very reliable. It doesn't even need a battery, except to meter. And the meter is great — a simple, direct needle which indicates the overall exposure of the whole frame. I find this much more enjoyable to use than the LED indicators used on newer fancier cameras. Combined ...


14

Apparently no one has mentioned the reciprocity error (Schwarzschild effect) when measuring for film, and it's probably the only things OP should be concerned about. You see, the response of the digital sensors was designed from the film response in the 1/10000 - 1" range, which was applied lineally to the rest of the range. In digital, to get an extra ...


14

The Nikon FG-20 has an electronic shutter, which will not work properly if no battery is inserted. You can, with limited capabilities, still use the camera without a battery. Light metereing will of course not work, but the shutter speeds are also restricted to B and a mechanically controlled 1/90s indicated as 'M90' on the speed dial. Unfortunately, the ...


12

The percentage dictates how much of the capture scene is visible to you before the capture. A true WYSIWYG situation is a 100% viewfinder because what you see with your eye will be what your final image gets. Anything less than 100% means that there are elements that will be captured in the scene that you cannot see at the time you look through the ...


12

As @Sandor Dosa comented. It is a light leak. It is difficult to know where the leak happened. Prior for you to use the film (a faulty film from start) Your fault during mounting the film. Your camera has a leak. The film is jammed. You handling the film prior to send it to develop. The lab during the handling and process. The bad news is, as you stated ...


11

For high level differences http://snapsort.com/ http://lenshero.com/ For more in depth analysis http://www.dpreview.com/products/cameras


11

Simple, it allows you to see exactly what the camera will "see" when you expose the shot. Nir has given you a part of the argument as well which is accuracy. In the "middle ground" of anything around mabye 20-100mm, building a rangefinder is not too difficult and Leica had adapters for longer and wider lenses if I am not mistaken. It takes some effort to ...


11

Just based on visual comparison, this lens appears to be a Helios 44M-4 58mm f/2-16. From the images you linked to, it appears that part of the lens is missing. In the 2nd image, around the lens barrel you can see what appears to be front element retaining clamps or springs. (Helios 44M-x Lenses, in order: 44M-4, 44M-5, 44M-6, 44M-7) How I found it: ...


11

Usually, it does not affect or limit the aperture or shutter speed at all. Rather, it tells the exposure meter where the center is. In some ways, it's exactly like exposure compensation dials. If the camera has a program mode, it's essential information for getting exposure right. If it doesn't, like the Pentax K1000, it just shifts the exposure needle — if ...


10

I'm not a big fan of Snapsort, because they really exaggerate small differences into big ones. This comes out in things like Much less shutter lag | 104 ms vs 238 ms | 2.3x less delay when taking photos This is from a comparison from the Pentax K-5 and Nikon D7000. I think the numbers apply to live view, but, probably when using a DSLR, you're not using ...


10

In my experience, transitioning from 95% to 100% made a significant difference in my photography. The 5% can hide a decent amount. Shooting a lot of wide-angle means that there can be a lot in the missing 5%. It's easy with my 10-22mm on my 7D to capture the foot of my tripod in that extra 5% and I'd rather not crop the image. You can't easily judge what ...


10

A full-frame DSLR like the D800 needn't be much bigger than a top end film SLR. And the F6 is a lot smaller than the F5 which weighed 1,445 g including batteries. The D4 weighs 1,340 g Digital Film


10

An SLR (digital or otherwise) usually has an interchangeable lens mechanism and given that the "zoom" is a property of the lens, not the camera, it's not possible to tell you on the camera. Basically, all the zoom range is is the ratio between the shortest and longest focal lengths of the lens so, for example, a 10mm - 100mm zoom lens has a 10x zoom ratio.


10

The scale on the bottom right of the LCD display is the exposure compensation scale. That's where the camera shows the current exposure compensation setting. Except in Manual mode, when the exposure compensation display is hijacked to be used to indicate how far your exposure settings deviate from the camera meter's recommended exposure. So in "Av" mode, ...


10

It depends on the specific camera. The Pentax K1000, for example, only requires the battery for metering, but everything else is mechanical. On your camera, shutter timing is electronic and requires a battery — but according to the manual there is a special setting M90 which provides a 1/90th of a second shutter speed which is all mechanical and can be used ...


9

The "X" multiplier zoom is simply the longest focal length divided by the shortest and is a misleading number with very little value, even when properly understood, unless you know ether the tightest or widest focal lengths. A 5 to 50mm focal length zoom is technically a 10x zoom, but doesn't cover all that big of a range. A 70 - 400mm zoom on the other ...


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