mirrorless – Why do DSLM designs almost never move the sensor layer all the way back to save on thickness?

I think that's a bit of a confused question: In response to xiota, it's important which of the distances between the flange and focal plane (FFD) and the distance between the rear and the focal plane is the smallest. This is why, for example, customized SLR lenses stand out in mirrorless cameras (the rear elements of SLR lenses need to clear the mirror, which is not the case with special mirrorless lens designs).

It is possible to see this by simply comparing FFDs for different mounts. There is a comfortable table here.

  • Fuji X mount is 17.7 mm
  • Sony E-mount is 18 mm
  • M4 / 3 is 19.25 mm
  • Mount M is 27.8 mm
  • Pentax K is 45.46 mm
  • Nikon F is 46.5 mm
  • Canon EF is 44 mm

It immediately shows that you can not assemble, no matter what you do both a lens from the short end of this list and a lens from the long end of this list, without any of them protruding far from the body, unless you are doing something absurd, as if you were inserting the mounting flange many millimeters into the body.

Although this is not a problem, simply moving the sensor in the camera body is also extremely inconspicuous. Sensors are thicker than films and have electronics that have to go somewhere. Almost all the cameras behind the sensor must also attach the screen to the back of the camera, which also requires support and electronics. You can see the differences when you compare camera designs where film and digital bodies are the same. A good example is M-mount cameras:

  • the M3 is 33.5 mm thick;
  • the M6 ​​is 33.5 mm thick;
  • Like the Minolta CLE, the Leica CL is 32 mm thick.
  • The Zeiss ZM is 32 mm thick.

It looks like the thinnest movie M-mount camera is about 32mm tall: I suppose the Leicas are a bit thicker because they're more robust. If one compares this with the above-mentioned FFD for M-mount, there is not much room for maneuver here.

Now look at the digital Ms:

  • the M8 is 39mm thick (not full size)
  • The M9 is 37 mm thick
  • The M10 is 39 mm thick

The mounting flange of a film M-mount camera is substantially flush with the front of the camera, so the digital Ms are not thicker because the mount is moved back further into the housing: they are thicker because the sensor is behind and behind the mount assemblies the support arrangements for the screen take up more space than films. If you look at the above dimensions, we can assume that & # 39; more space & # 39; somewhere around 5-6 mm (and we can also deduce from the M-mount FFD that the film, the printing plate and the back of the camera are on an M6, for example) is a bit under 6mm all in: it's pretty easy to confirm that this is true for most movie cameras, of course, by opening the back and measuring the thickness of the film).

Of course not now knows that it is not possible to make things thinner. But I think it's pretty clear that if Leica could do it, they would do it – there were a lot of negative comments about the size of the digital woman. We know that they get sensors tailored to their needs (since they produce cameras with monochrome sensors). So you talk to the sensor manufacturers. So it's hard to make that thing thinner.

If we put this together, we can see a few things.

  • It is not possible to mount lenses with very different FFD distances on the same body, without one of them having a -adaptor that protrudes far from the body (or sinking one of the brackets far into the body) I find absurd). In the case of e-mount, for example, there is a difference 26 mm – more than an inch – between his FFD and the Nikon FFD.
  • The sensors and their support arrangements (including the back of the camera, the screen, etc.) appear to be at least about 10 mm.
  • A camera that can mount a Nikon SLR lens with the mounting flange flush with the housing must therefore be about 54 mm thick.

It is then difficult to find dimensions for cameras, as they often contain different handles. However, the Fuji X-Pro 2 should be about 35 mm thick at the thinnest point, which looks a bit thicker than it needs to be (compare the FFD for their lenses, 17.7 mm with the FFD for M-mount lenses from 27 , 8 mm) The M9 is 37 mm thick and you can see how much work Leica must have done to make things thin. To mount a Nikon SLR lens on an X Pro 2, the camera must be nearly 20 mm thicker. That's probably not a compromise someone wants to do.

Probability – sensor and random variable

Please imagine, I have a sensor D that measures that temperature in my room. My issue and questions are:
Some articles claim to model it as a Random Variable (RV) X. What does that mean? My understanding is that in order to model it as an RV, we need to look at a probability space as follows

  1. define an experiment / random phenomenon (eg measuring the temperature in my room);
  2. determine the sample space (eg Set Power (N) = {N, {1}, {2}, .. {1,2}, {1,3} …};
  3. Assignment of probabilities to the individual events in the Sample Space (eg in Set Power (N))
  4. then I define a random variable X as a function of the sample space to the real field R, z. , etc., etc

I'm confused. Could you explain the topic? I would highly appreciate it. Many thanks.

Humidity – Canon 5D MK-I wet marks in the sensor problems

A few months ago I just tried with a Canon 5D MK-I to try the FF world with my 50mm lens in a low price.

The shame is that the sensor had big traces of moisture while it was at home (I know it's an old body), while my Pentax machines have no problems at all. (big shame here at Canon).

The question is: how do I remove these marks? I tried to put condensation rescuers on the camera and so on, but it never worked. It looks so much harder for me.

I put it in a less humid place like my relative's house, but part of it would like to hear if you have any other ideas.

Thank you for your advice,

dslr – Are mirrorless cameras more susceptible to sensor dust?

The air is full of dust. It's floating around all the time. When you open the lens in a dusty environment (ie, "any environment that is not a clean room"), dust gets into the lightbox of the camera.

They did not ask, but that's why it seems stupid to advise people to lower their camera while they change lenses. It finally falls gradually. When you are in a particularly dusty situation, the most important thing is fast,

The risk is not really that dust falls directly on the sensor when exposed. It happens that dust hovering around sometime settles there and sticks. In the question you want to link, the shutter itself does not protect much against it, as it "violently" opens and distributes dust.

In fact, the larger mirror box in a DSLR camera is just more room for dust that impacts when waiting for a problem. I do not know if this is a real problem. In my experience, the automatic dedusting systems, which contain all the cameras, have become very good in the last ten years.

I know with certainty that the sensor is easier to reach when problematic dust builds up, which is at least mirrorless.

Dell C1100 / CS24-TY lost SDR file (sensor record)?

Dell C1100 / CS24-TY lost SDR file (sensor record)? | Web Hosting Talk

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var sidebar_align = & right; & # 39 ;;
var content_container_margin = parseInt (& # 39; 350px & # 39;);
var sidebar_width = parseInt (& # 39; 330px & # 39;);
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  1. Dell C1100 / CS24-TY lost SDR file (sensor record)?

    Hello,
    I have a Dell C1100 / CS24-TY server. I am trying to update the firmware version 1.84 / 1.85 / 1.86. However, the normal fan of the server will be over 13000 rpm. The server has lost the SDR file (sensor data record)? Could you have an SDR file (Sensor Data Record) and make it available to me? Many Thanks.


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SD Card – Broken Touch Sensor and Defective LCD Adb

During a drop, my phones (galaxy j3 6v) (LCD and touch sensor) therefore no longer respond. I think I've enabled USB debugging, but I can not be sure.
I have a Linux machine with Android tools installed and I am familiar with the command line.
I tried to connect to Adb, but I get the mistake

Error: device not authorized.
$ ADB_VENDOR_KEYS of this adb server is not set
Try & # 39; adb kill-server & # 39; if that seems wrong.
Otherwise, look for a confirmation dialog box on your device.

I've already killed and restarted the server, added udev rules, added the phone provider ID to .android / adb_usb.ini, and called Samsung support (they had no idea what I was talking about)

Am I SOL or is there a way to bypass the confirmation dialog?

Canon – Do these particles affect the image quality on the sensor?

This is not uncommon with f / 36 and enhanced contrast when you use your camera outdoors and often change the lenses for some time.

Apart from diffraction problems, this is another reason why f-stops smaller than f / 11 are unpopular in modern digital photography.

Dirt that only stops the light in certain places is almost irrelevant to images taken with larger apertures, unless you rely heavily on certain effects in the camera blurred Areas of the image – for example, if you work with massive bokeh balls, there is a chance that dust will appear in each one of them.

There are apparently some translucent fouling spots (oil? Dried sugar?) That can actually lead to a deterioration in image quality, as they can bend the light somewhere it does not belong, instead of stopping it.

If you actually had a single event where you know that a lot of dust has entered (for example, change lenses while facing a cloud of dust), you should know what kind of dust was the best way around it to clean. If you know that the dust is abrasive, take special precautions to avoid scratching the sensor. You will find plenty of instructions for cleaning sensors. If you are not sure if you have a camera business, do it, but tell them about the situation where you got the dust.

canon – Do these particles affect the image quality on the sensor?

I have a Canon Rebel T6. I'm really a freshman and know very little about photography. I think I made a big mistake and accidentally left dust in the sensor area and the mirror area. I took a picture with f / 36.4, ISO 200 and 1/40 sec. On a white illuminated area. I also increased the contrast with GIMP.
example

Do dust or dirt affect the image quality? I bought the camera a month ago. I do not know what that causes, but I can also see dirt and fabric on the viewfinder because I have it hard in the upper part (above the mirror) and cleaned it with a magic fiber.

What can I do?

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