What if I get another camera with more back focus?If the camera has a much longer back focus, say 65 mm, you will need to remove one or more of the extensions that came with the field flattener assembly and replace them with shorter extensions. In this case you will need to shorten the extensions by 10 mm so the field flattener assembly has a back focus of 65 mm, matching the camera.

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To check your webcam in Skype, click on the three dots near the upper-left of Skype's main page, and then click "Settings."

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SCTback focus

La lunghezza focale è la distanza tra la messa a fuoco nella lente dell'obiettivo e il sensore della fotocamera. La messa a fuoco è il punto più nitido del ...

Then, on the left-hand side, click "Video." There will be a small video to the right side of the popup if your webcam is working correctly.

Telescopeback focuscalculator

Click the three dots or three bars in the top right of your browser and go to Settings. Then look for a "Privacy" menu. The controls for webcam and microphone access are there in most browsers.

Focal reducerback focus

If none of those steps help, you should try the webcam on another computer. If it isn't working there either, it is most likely the webcam itself is broken, and you'll need to replace your webcam .

Diameter of the field of view (mm) = F / M, where F is the number of field of view (FOV) of the eyepiece, and M is the magnification (mag.) of the objective.

The controls for the microphone are exactly like the camera. Make sure enable access for the program you're trying to use.

While you're here, you should double check your microphone settings. Click the back arrow in the very top left-hand corner of the window. Then, scroll down until you see "Microphone" and click it.

What if I get another camera with less back focus?  Now if you buy a camera with a different back focus you can still use the field flattener but you will need to adjust the spacing. Let's say you have a DSLR working perfectly but now you purchase a one-shot color ccd or cmos camera that only has a 49 mm back focus. Here is what you do:

Definition: points to which parallel input rays are concentrated by an optical system, and the planes going through those points.

Stellarvue field flatteners and reducer/flatteners come with extension tubes and spacer rings. These are added to the flatteners to reach the standard DSLR spacing of 55 mm. So when you purchase our field flattener for a given telescope it will come with the spacers and/or extensions needed for it to work with a DSLR, ZWO and many other cameras. In the picture below we show the SFFX-1 Universal Field Flattener designed for the Stellarvue SVX080T refractor:

The Set Up: Now that you have determined the back focus of the flattener assembly (field flattener with extensions and adapter) and the camera are the same back focus it is time to attach everything. We will use a DSLR with t-ring as our example.

ASI183MCback focus

Spacing is critical. What does this mean? For the photographic field flattener to work properly it must be a precise distance from the camera sensor. If it is too far away from the sensor or too close, the stars around the edge will be distorted. So to make sure the field flattener is spaced correctly from the camera you need to know the distance from the camera's attachment thread to its sensor. This distance, measured in millimeters is known as the "camera back focus."

Refractor telescopes are made to be used visually with an eyepiece. To use a telescope for photography an optical device is needed to convert your telescope from a visual instrument to a photographic camera lens. This optical device is a field flattener (or reducer/flattener). Without a field flattener stars that are not in the center will appear distorted.

Back focusastrophotography

Again, camera back focus has nothing to do with focusing. It is the distance in millimeters from the front of the camera to the sensor in the camera. The back focus distance for a Canon or Nikon camera with the lens removed and a t-ring attached in its place is 55 mm. We refer to this as the "standard DSLR spacing."

Obviously, to get the sensor spaced properly fom the field flattener you need to add 6 mm of spacing. You do this using extension tubes and spacer rings available from Stellarvue. Since you need to add 6 mm, you will use a 5 mm extension tube and a 1 mm spacer ring. Remember, the extension tubes and spacer rings need to be the same thread size as the field flattener and camera (in this case they are M48).

Google also put the option to check your video directly on the meeting page. Once you've joined a meeting, click "Check your audio and video."

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Round 1 1/4" diameter metal connector allows 1 or 2 additional wiring and ... Round 2" diameter connector allows additional pin for auxiliary 12 volt power or ...

Back focuschart

Your browser also has security measures in place to prevent websites from accessing your microphone and camera without permission. Normally a website like Omegle that requires them will prompt you when it is trying to access your webcam or microphone. Each browser is a little different, but they all look similar to the one below.

How to checkback focus

Webcams that plug into a USB port can come loose, or the USB port itself can be bad. Double-check that your webcam is securely plugged into a USB port. You should also try changing which port the webcam is plugged into — sometimes the USB port itself can be the problem. If you have a desktop PC with USB ports on the front or top of the case, try connecting to a USB port on the back of the computer.

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Your webcam might require special software from the manufacturer to work correctly. The easiest way to find these is to go directly to the manufacturer's website — driver downloads are usually found on the support page.

There are two places you can check your camera with Google Meet. The first is on the Google Meet home page. Click on the gear in the top right corner of the page.

This standard DSLR spacing is the same for some but not all ccd or cmos cameras. For example, ZWO cameras come with extension tubes that provide a back focus of 55 mm. This makes it easy to swap out ZWO cameras with DSLR cameras.

Once you've turned it on, the easiest way to test your webcam is with the built-in camera application. Click on the Start button, type "camera", and then click the Camera app.

We make our field flatteners with a long back focus so they will work with a variety of cameras. This way, if you buy a new camera with a different back focus, you can merely obtain the proper extension tubes and spacer rings required for your camera.

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Click the switches for "Camera access" and "Let desktop apps access your camera" if they're set to off. Then look through the list of applications and make sure that the program you're trying to use has been set to "On."

55mmback focus

Most applications and browser-based video chat services include the ability to test your audio and video. Here are some basic instructions for some of the most popular options.

Unfortunately, many ccd and cmos camera manufacturers do not conform with the standard DSLR spacing of 55 mm. So you need to know your camera's total back focus (again, distance from the thread to sensor) to make sure the field flattener is the proper distance from the sensor. Now don't start sticking a ruler down your camera opening! Check with the camera manufacturer. They should have the actual back focus spacing listed in the manual or on their website.

Using Photographic Field Flatteners (and Reducer/Flatteners) Refractor telescopes are made to be used visually with an eyepiece. To use a telescope for photography an optical device is needed to convert your telescope from a visual instrument to a photographic camera lens. This optical device is a field flattener (or reducer/flattener). Without a field flattener stars that are not in the center will appear distorted.  Spacing is critical. What does this mean? For the photographic field flattener to work properly it must be a precise distance from the camera sensor. If it is too far away from the sensor or too close, the stars around the edge will be distorted. So to make sure the field flattener is spaced correctly from the camera you need to know the distance from the camera's attachment thread to its sensor. This distance, measured in millimeters is known as the "camera back focus."   Again, camera back focus has nothing to do with focusing. It is the distance in millimeters from the front of the camera to the sensor in the camera. The back focus distance for a Canon or Nikon camera with the lens removed and a t-ring attached in its place is 55 mm. We refer to this as the "standard DSLR spacing."  This standard DSLR spacing is the same for some but not all ccd or cmos cameras. For example, ZWO cameras come with extension tubes that provide a back focus of 55 mm. This makes it easy to swap out ZWO cameras with DSLR cameras.   Unfortunately, many ccd and cmos camera manufacturers do not conform with the standard DSLR spacing of 55 mm. So you need to know your camera's total back focus (again, distance from the thread to sensor) to make sure the field flattener is the proper distance from the sensor. Now don't start sticking a ruler down your camera opening! Check with the camera manufacturer. They should have the actual back focus spacing listed in the manual or on their website.  Stellarvue field flatteners and reducer/flatteners come with extension tubes and spacer rings. These are added to the flatteners to reach the standard DSLR spacing of 55 mm. So when you purchase our field flattener for a given telescope it will come with the spacers and/or extensions needed for it to work with a DSLR, ZWO and many other cameras. In the picture below we show the SFFX-1 Universal Field Flattener designed for the Stellarvue SVX080T refractor:      As you can see this flattener assembly is supplied with two extension tubes and an adapter. When these extension tubes are threaded on as shown, the flattener assembly will give its best performance with an 80 mm f-6 telescope and a camera with a 55 mm back focus. Since DSLR cameras with a t-ring have a 55 mm back focus, this flattener with the extensions in place is matched to the camera. You thread the flattener's M48 thread into the camera's t-ring and you are good to go!    What if I get another camera with less back focus?  Now if you buy a camera with a different back focus you can still use the field flattener but you will need to adjust the spacing. Let's say you have a DSLR working perfectly but now you purchase a one-shot color ccd or cmos camera that only has a 49 mm back focus. Here is what you do: Obviously, to get the sensor spaced properly fom the field flattener you need to add 6 mm of spacing. You do this using extension tubes and spacer rings available from Stellarvue. Since you need to add 6 mm, you will use a 5 mm extension tube and a 1 mm spacer ring. Remember, the extension tubes and spacer rings need to be the same thread size as the field flattener and camera (in this case they are M48).  What if I get another camera with more back focus?If the camera has a much longer back focus, say 65 mm, you will need to remove one or more of the extensions that came with the field flattener assembly and replace them with shorter extensions. In this case you will need to shorten the extensions by 10 mm so the field flattener assembly has a back focus of 65 mm, matching the camera.  We make our field flatteners with a long back focus so they will work with a variety of cameras. This way, if you buy a new camera with a different back focus, you can merely obtain the proper extension tubes and spacer rings required for your camera.   The Set Up: Now that you have determined the back focus of the flattener assembly (field flattener with extensions and adapter) and the camera are the same back focus it is time to attach everything. We will use a DSLR with t-ring as our example.  You are now ready to simply focus and shoot.

As you can see this flattener assembly is supplied with two extension tubes and an adapter. When these extension tubes are threaded on as shown, the flattener assembly will give its best performance with an 80 mm f-6 telescope and a camera with a 55 mm back focus. Since DSLR cameras with a t-ring have a 55 mm back focus, this flattener with the extensions in place is matched to the camera. You thread the flattener's M48 thread into the camera's t-ring and you are good to go!

You should always check and make sure that your webcam works before an important video meeting. Here's how to do it in Windows 10 and 11 — and in some popular video-chatting apps, including Zoom, Google Meet, and Discord.

Some video calling services, like Google Meet, work through your browser. If you're trying to use a browser-based service, make sure you enable camera access for your browser.

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Windows limits programs' access to your webcam and microphone to help protect your privacy and security. Normally this is excellent, but it can occasionally result in your webcam working in some programs and not others.