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Kenko 2x APK Teleplus MC4: pros and cons of a 4-element teleconverter

What is a 2x apk teleplus mc4 and how to use it with your Android device

If you are looking for a way to extend the reach of your Pentax K lens without spending a fortune on a new telephoto lens, you might be interested in a gadget called a 2x apk teleplus mc4. This is a type of teleconverter that fits between your lens and your camera body and doubles the focal length of your lens. For example, if you use it with a 70-200mm f/2.8 lens, it will turn it into a 140-400mm f/5.6 lens.

But what does apk mean? And how can you use this teleconverter with your Android device? In this article, we will explain what these terms mean and how they work together. We will also show you how to install and use an apk file on your Android device, which is an alternative way to download apps that are not available on the Google Play Store. By the end of this article, you will know how to use a 2x apk teleplus mc4 with your Android device and get closer to your subjects without compromising image quality.

2x apk teleplus mc4

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What is a teleconverter and how does it work

A teleconverter (sometimes called tele extender) is a secondary lens that mounts between your primary lens and your camera body. It enlarges the central part of the image made by your lens, giving you more magnification or zoom. For example, a 2x teleconverter will double the focal length of your lens, so that a 300mm lens becomes a 600mm lens.

However, using a teleconverter also has some drawbacks. The main one is that it reduces the maximum aperture of your lens by the same factor as the magnification. For example, if you use a 2x teleconverter with an f/2.8 lens, it will become an f/5.6 lens. This means that you will lose two stops of light, which can make it harder to shoot in low-light conditions or achieve shallow depth of field. Another drawback is that using a teleconverter can degrade the image quality of your lens, especially at the edges or corners. You may notice more distortion, chromatic aberration, or loss of sharpness.

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There are different types of teleconverters available for different camera systems and lenses. The most common ones are 1.4x and 2x, but there are also 3x and 4x teleconverters, but they are less common and more prone to image quality issues. Teleconverters are usually designed to work with specific lenses or lens families, so you need to check the compatibility before buying one. For example, the Kenko 2x APK Teleplus MC4 teleconverter that we will discuss later is compatible with Pentax K mount lenses, but not with all of them.

What is an android apk and how to install it on your device

An android apk (short for Android Package Kit) is a file format that contains the code, resources, and metadata of an Android app. It is similar to an executable file (.exe) for Windows or a package file (.pkg) for Mac. An apk file can be downloaded from various sources on the web, such as third-party app stores, developers' websites, or file-sharing platforms. An apk file can offer some advantages over the apps that are available on the Google Play Store, such as:

  • Accessing apps that are not available in your region or country

  • Installing apps that are not compatible with your device or Android version

  • Getting the latest updates or features of an app before they are officially released

  • Trying out beta or modded versions of an app

  • Saving bandwidth or storage space by downloading smaller or compressed apk files

However, installing an apk file also has some risks and drawbacks, such as:

  • Exposing your device to malware or viruses that may harm your data or system

  • Violating the terms and conditions of the app developer or Google Play Store

  • Losing the warranty or support of your device manufacturer or carrier

  • Causing compatibility or performance issues with your device or other apps

  • Missing out on the security updates or bug fixes of the official app version

Therefore, you should only download and install apk files from trusted and reputable sources, and always scan them with a reliable antivirus app before opening them. You should also backup your data and system before installing any apk file, in case something goes wrong.

To install an apk file on your Android device, you need to follow these steps:

  • Enable unknown sources on your device. This is a security setting that allows you to install apps from sources other than the Google Play Store. To do this, go to Settings > Security > Unknown sources and toggle it on. You may see a warning message that tells you about the risks of installing unknown apps. Tap OK to proceed.

  • Download a file manager app on your device. This is an app that lets you browse and manage the files and folders on your device's internal or external storage. You can use any file manager app that you like, such as ES File Explorer, Solid Explorer, or Astro File Manager. You can download them from the Google Play Store or from their official websites.

  • Download the apk file that you want to install on your device. You can use any web browser app that you like, such as Chrome, Firefox, or Opera. You can also use a USB cable to transfer the apk file from your computer to your device's storage.

  • Locate and open the apk file using the file manager app. You may need to navigate to the folder where you downloaded or saved the apk file, such as Downloads, Documents, or SD card. Tap on the apk file to open it. You may see a confirmation message that asks you if you want to install the app. Tap Install to proceed.

  • Wait for the installation process to complete. This may take a few seconds or minutes, depending on the size and complexity of the app. You may see a progress bar or a notification that shows you the status of the installation. When the installation is done, you may see a message that tells you that the app has been installed successfully. Tap Open to launch the app, or Done to exit.

How to use a 2x apk teleplus mc4 with your Android device

Now that you know what a teleconverter and an apk file are, and how to install them on your device, let's see how you can use a 2x apk teleplus mc4 with your Android device. This is a specific model of teleconverter made by Kenko, a Japanese company that specializes in camera accessories. It is designed for Pentax K mount lenses, which are compatible with Pentax DSLR cameras and some mirrorless cameras with adapters.

The Kenko 2x APK Teleplus MC4 teleconverter has the following features and specifications:- It has a 2x magnification factor, which means that it doubles the focal length of your lens

- It has a 4-element, 4-group optical design with multi-coated elements to reduce flare and ghosting

- It has an AF (autofocus) function that works with most Pentax K mount lenses, but not all of them

- It has a DGX (digital) function that communicates the effective aperture and focal length to the camera body

- It has a MC4 (multi-coated 4) function that improves the light transmission and contrast of the image

- It has a KAX (K mount automatic) function that supports the automatic exposure modes of the camera body

- It weighs 111 grams and measures 26 x 24 mm

To use the Kenko 2x APK Teleplus MC4 teleconverter with your Android device, you need to have a Pentax K mount lens and a compatible camera body. You also need to have an adapter that allows you to connect your camera body to your Android device via USB or Wi-Fi. For example, you can use the Pentax Image Sync app and the Pentax O-FC1 FluCard to remotely control your camera and transfer images to your device. Alternatively, you can use the DSLR Controller app and a USB OTG cable to connect


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