Spring 2012

Spring 2012
by ani

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Pertaining to the physical and functional design of camera bodies.

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32
votes
4answers
2k views

Why don't they make all DSLRs with an electronic shutter?

Why don't they make all DSLRs with an electronic shutter? Is it technically possible? Surely this would allow easier syncing with flashes (rather than the usual 1/200s or 1/250s max). I could even ...
27
votes
8answers
2k views
20
votes
3answers
3k views

Why is there a mechanical shutter in a digital camera?

I understand that in a camera the diameter of shutter opening — the aperture — controls how much light comes in, and this affects the resulting exposure. But I don't understand why, in a digital ...
17
votes
4answers
20k views

What are shutter actuations?

I was just reading the question How many actuations are "too many actuations"? and trying to figure out what a shutter "actuation" actually is. The only thing I can guess is that it's the number of ...
17
votes
3answers
11k views

What makes a camera 'weather sealed'?

What is the structural and mechanical differences between a weather sealed body and a non weather sealed body? Is weather sealing still effective if the lens isn't weather sealed?
17
votes
3answers
1k views

Why don't cameras have autofocus points in the edges and corners?

On all the DSLRs I've used, there are never any autofocus points near the edges and corners. Why is that?
16
votes
3answers
649 views

Why is there not a protective glass element that is between the lens and shutter in a SLR?

With the danger of dust on all SLR cameras, it only seems logical that adding a simple glass element that went between the lens and shutter (mounted on the camera) would both protect the camera's ...
14
votes
3answers
4k views

How are the red focus point indicators displayed on a dSLR's focusing screen?

The question Why do the focus points leds appear shadowed? raises another question for me. How are these indicator lights implemented in typical dSLRs? Are they actually small LEDs etched into the ...
14
votes
1answer
1k views

What does the pentaprism/pentamirror do?

In an SLR, the light bouncing off the mirror goes through a pentamirror or pentaprism before being reflected to the viewfinder. However, it seems to me that it would be possible to project an image to ...
10
votes
3answers
2k views

How do SLR lenses connect to the body?

I recently bought my first SLR camera and lens for it and I have questions about how they interact. My lens attaches on, and I can use the focus on the lens itself, but if I use the auto-focus, does ...
10
votes
1answer
1k views

What is a magnesium alloy shell?

I have a Canon DSLR with a magnesium alloy shell. What does this mean, what are the other metals that make it an alloy, and why was magnesium used and not aluminium and steel?
10
votes
4answers
521 views

Does the convergence of video and photo technology in digital cameras have a negative impact on strictly photographic ability?

With every new Canon and Nikon camera we are witnessing the progression of an unprecedented convergence of video and photography ability, something completely unthinkable during the film era. But I ...
9
votes
7answers
2k views

Why has no one invented a 4:5 aspect ratio APS-C/35mm-sized DSLR?

People keep inventing different form factors and formats for cameras, but none seems to have hit on what seems (to me) like an obvious one. Why doesn't somebody build a camera with a sensor that has a ...
9
votes
5answers
3k views

Why don't people care any more about shutter speed accuracy?

With most old (film) cameras people were concerned about shutter speed accuracy at all speeds even if it was an electronic shutter. Nowadays, people seem not to be concerned with this when buying ...
9
votes
4answers
778 views

Why the need for SLR in digital cameras?

Excuse my ignorance but as far as I know, SLR was invented in order to get the photographer to see (through the viewfinder) exactly what image will fall on to the film. In digital cameras the image ...
9
votes
1answer
3k views

What is the difference in purpose between a focal plane shutter and a leaf shutter on a camera?

I inherited my Grandfather's beautiful Graflex Crown Graphic which he used for his entire career as a portrait photographer. (It's the picture on my avatar if you want to see it.) Doing research on ...
8
votes
6answers
691 views

Why is there no full-frame but low res sensor?

So I just watched a review on the Sony NEX-7, which is 24MP in APS-C size.... I am a Canon user and I immediately think about the announced Canon Powershot G1X with almost APS-C sensor but at a lower ...
8
votes
6answers
720 views

Why is the main sensor not used instead of the separate AF sensor to focus a DSLR?

From this answer I understand that the reflex mirror of a DSLR is actually not reflecting all the light, but it passes a certain amount on to the AF sensor. So if the reflex mirror can pass light, ...
8
votes
3answers
888 views

Why is the neck strap of an SLR attached to the top plate of the body?

Why is it that the neck strap of an SLR is attached to the top of the body? In my opinion it would be better if the neck strap would be attached to the bottom of the camera body. This would have the ...
7
votes
5answers
1k views

Why not have the diaphragm in camera body instead of the lens?

Why is the diaphragm to control the amount of light entering the camera typically in the lens and not the camera body itself?
7
votes
5answers
3k views

Why do DSLR cameras still use monochrome LCD as their top displays?

It's 2015 now. Why do DSLR cameras still use monochrome LCD as their top displays? A raster graphics display screen would be more useful and could display more different information.
6
votes
3answers
3k views

What are the consequences of making camera bodies black?

Considering that silver and other camera colors are outsiders, I wonder if there is a specific reason to make black camera bodies. I can think of several "marketing" reasons (discretion, first, or ...
6
votes
1answer
448 views

Why is the IR filter present when there is already the Bayer filter on an image sensor?

I have been trying to remove the Bayer filter from the CCD image sensor of my camera. Now I see there's an IR filter before the lens, however I don't understand the point of it because isn't the Bayer ...
6
votes
1answer
1k views

Where is the AF sensor located in a DSLR?

As I understand every DSLR has a separate, smaller sensor that handles phase detection focusing. Where is it located? If this location is different for every DSLR, and therefore this broad question ...
6
votes
1answer
291 views

What characteristics make a digital sensor good?

Generally, the technical image quality of a digital image (before we get to the post-processing stage) is the product of the characteristics of the lens and the recording medium, with an important ...
5
votes
5answers
390 views

Why do cameras use a slit between two curtains rather than exposing the entire sensor instantly?

Why is it more effective to use "a slit travelling from top to bottom of the sensor" in faster shutter speeds, rather than exposing the entire sensor instantly? And the slit thing only comes in fast ...
5
votes
6answers
1k views

Have cropped digital sensors reached their peak design limits?

APS-C and smaller sensors seem to have plateaued off in terms of their megapixel counts, possibly due to diffraction limits. The ISO performance of these sensors has not increased substantially in the ...
5
votes
3answers
974 views

What's the difference between vertical and horizontal shutters?

I've always thought that shutters were composed of two vertical curtains that moved along the sensor in order to expose it (at least for most DSLRs). Recently I've bought a Pentax K1000 that ...
5
votes
2answers
159 views

Why are rangefinders not directly above the lens?

It seems the biggest gripe about rangefinders (vs SLRs) is that your shots are not quite what you see, there is a parallax error due to not seeing through the lens. Which makes me think, if you put ...
5
votes
1answer
155 views

Where can I find viewfinder adaptions for the Fujifilm HS series?

For model series S/HS, in particular HS25, HS30, ... That Fujifilm's viewfinder seems designed (misdesigned) only for persons with very wide set eyes (or with very non-prominent noses and nose ...
4
votes
7answers
4k views

What is the benefit of a vari-angle LCD monitor on a camera? [duplicate]

Nikon D5100 (which I am thinking to buy) has a vari-angle LCD monitor. What benefit does it add? Can you take your own self-portrait snaps like this? Is it practical or is it a non-cashable worth-...
4
votes
4answers
258 views

How small can current SLRs get and still give comparable photo quality?

Let's take the full-frame Canon 5D as example. How small can this camera be and still give comparable picture quality? What are the design constraints? Besides the sensor, the body, can the lenses ...
4
votes
2answers
2k views

Why are there no full-frame lenses with leaf shutters?

I see that many medium format lenses are made with leaf shutters, which allow much faster flash syncing speeds, so why doesn't anyone put them in FF lenses?
4
votes
2answers
226 views

What is the maximum aperture consistent with the Nikon F-mount?

In a related thread, it's been debated whether there is a hard limitation to maximum possible lens aperture; it seems there is none. However, using the example of the nikon F mount, this technical ...
3
votes
4answers
580 views

Why do you need a viewfinder in MILC?

What are the main reasons for choosing a mirrorless camera with a viewfinder?
3
votes
5answers
410 views

Do all cameras with autofocus need motors?

Do all autofocus cameras need motors to drive the lens? I would have thought today's modern electronics rendered motors obsolete.
2
votes
2answers
162 views

How does a camera meter light when the shutter is closed?

I have read when we check the image from viewfinder, we can set the aperture, shutter speed and ISO based on the light coming through the shutter. But, only when we click the shutter release is the ...
2
votes
2answers
84 views

Is the anti alias filter really a blurring filter?

I'm trying to dig into the nature of how the anti aliasing filter works. This is of importance to me as I need to capture small details at the very edge of the resolution limit of the cameras lens as ...
2
votes
2answers
484 views

CCD sensors use a digital shutter. Why don't the more expensive CMOS sensors?

This answer mentions that CMOS sensors "cannot" use digital shutters where as CCD sensors can. Even if some models have the ability to, it is certainly typically for CMOS sensors to use mechanical ...
2
votes
2answers
62 views

Have lens/camera bodies been repairable by the consumer/user back in the day?

Context I've been skimming LensRental and related websites and I see most all modern lens are extremely complicated, intricate, expensive but they work, mostly. I see that with a7rII, there is an ...
1
vote
2answers
175 views

Why don't cameras have automatic eyepiece covers?

The question is clear and I am not sure how to further explain it. Why don't cameras have internal automatic eyepiece covers?
1
vote
3answers
226 views

Why did Pentax change to open-aperture metering when this causes the need to stop-down for old lenses?

On my Pentax ME Super with a legacy lens (Pentax SMC 50mm 1.7) my camera meters at all aperture ring settings. Yet, if I transfer this lens to a modern Pentax DSLR, I need to stop down the lens to ...
1
vote
1answer
85 views

Does the position of the flash in compact cameras make a real difference in reducing red eye?

I am interested whether the position of the flash at the three examples of point and shoot cameras below would avoid or at least decrease the red eye effect. Or do you feel that all flashes are still ...
1
vote
2answers
1k views

What kind of plastic is used for good camera bodies?

My Canon DSLR camera bodies are made with glass filled plastic over aluminum skeleton. What is glass filled plastic? It doesn't have the same cheap feeling as common plastic items. I've seen knife ...
1
vote
1answer
53 views

Is it possible to use a single image sensor to capture a stereoscopic image?

I was wondering if there is a way of splitting a digital image sensor's surface in two and using it to capture a stereo version of an image, maybe using some clever optical system with mirrors (like ...
1
vote
1answer
91 views

Does sensor type affect image quality? [duplicate]

I've recently discovered snapsort.com and use it to compare other cameras with the one I own. When comparing Pentax k10D with the K-x model I learned that the K-x has a CMOS sensor and that CMOS-...
0
votes
2answers
309 views

Is it coincidence that Nikon F lenses can fit a Canon EF body (with an adapter)?

A Nikon F mount lens is small enough to fit (via an adapter) into a Canon EF mount camera. Is this by design (IE did Nikon design the whole bayonet to be small enough, or Canon design the EF to be ...
0
votes
2answers
182 views

What are all the options or features a DSLR camera body can have?

I was curious to know if there was a place that lists all the options that are possible on a DSLR camera or even which cameras have them? for example: Video recording, Night vision, The speed in ...
0
votes
0answers
52 views

3D model file searching for Sony QX1

I am looking for Sony QX1 3D model file. Because I want to add the integrated circuit on QX1. Actually I don't known that this question to ask in here. Sorry if I have mistake. Sorry my language. ...
-2
votes
4answers
327 views

Why aren't devices with two cameras more popular?

I mean a device that has two sensor / lens combinations. I can see several advantages: Capturing photos with a higher dynamic range. Focus bracketing. Capturing multiple photos and merging them to ...