![Telescopes for Adults, 70mm Opening and 700mm Focal Length, Professional Astronomy Refractor Telescope for Kids and Beginners, with EQ Mount, 2 Plössl Eyepieces and Smartphone Adapters: Amazon.de: Electronics & Photo Telescopes for Adults, 70mm Opening and 700mm Focal Length, Professional Astronomy Refractor Telescope for Kids and Beginners, with EQ Mount, 2 Plössl Eyepieces and Smartphone Adapters: Amazon.de: Electronics & Photo](https://m.media-amazon.com/images/W/IMAGERENDERING_521856-T1/images/I/61+VVQ9l7UL._AC_SY450_.jpg)
Telescopes for Adults, 70mm Opening and 700mm Focal Length, Professional Astronomy Refractor Telescope for Kids and Beginners, with EQ Mount, 2 Plössl Eyepieces and Smartphone Adapters: Amazon.de: Electronics & Photo
![Measuring the focal length of a camera lens in a smart-phone with a ruler: The Physics Teacher: Vol 57, No 1 Measuring the focal length of a camera lens in a smart-phone with a ruler: The Physics Teacher: Vol 57, No 1](https://aapt.scitation.org/action/showOpenGraphArticleImage?doi=10.1119/1.5084932&id=images/medium/1.5084932.figures.online.f3.jpg)
Measuring the focal length of a camera lens in a smart-phone with a ruler: The Physics Teacher: Vol 57, No 1
![Smartphone Cameras Address the Issues of Auto-Focus, Cost, Focal Length in Very Small Spaces_6/7/20 - OLED Association Smartphone Cameras Address the Issues of Auto-Focus, Cost, Focal Length in Very Small Spaces_6/7/20 - OLED Association](https://www.oled-a.org/uploads/9/6/8/6/96867108/published/screen-shot-2020-06-07-at-2-48-00-pm.png?1591559301)
Smartphone Cameras Address the Issues of Auto-Focus, Cost, Focal Length in Very Small Spaces_6/7/20 - OLED Association
![Flashback: periscope zoom cams with smooth zoom are the future, but we already had them - GSMArena.com news Flashback: periscope zoom cams with smooth zoom are the future, but we already had them - GSMArena.com news](https://fdn.gsmarena.com/imgroot/news/20/12/flashback-asus-zenfone-zoom/inline/-1200/gsmarena_004.jpg)
Flashback: periscope zoom cams with smooth zoom are the future, but we already had them - GSMArena.com news
![Measuring the focal length of a camera lens in a smart-phone with a ruler: The Physics Teacher: Vol 57, No 1 Measuring the focal length of a camera lens in a smart-phone with a ruler: The Physics Teacher: Vol 57, No 1](https://aapt.scitation.org/action/showOpenGraphArticleImage?doi=10.1119/1.5084932&id=images/medium/1.5084932.figures.online.f1.jpg)
Measuring the focal length of a camera lens in a smart-phone with a ruler: The Physics Teacher: Vol 57, No 1
![Know Your Smartphone: A Guide to Camera Hardware > Megapixel Count, Sensor, Pixel Size, Focal Length | TechSpot Know Your Smartphone: A Guide to Camera Hardware > Megapixel Count, Sensor, Pixel Size, Focal Length | TechSpot](https://static.techspot.com/articles-info/850/images/OneM8F-13.jpg)
Know Your Smartphone: A Guide to Camera Hardware > Megapixel Count, Sensor, Pixel Size, Focal Length | TechSpot
![Know Your Smartphone: A Guide to Camera Hardware > Megapixel Count, Sensor, Pixel Size, Focal Length | TechSpot Know Your Smartphone: A Guide to Camera Hardware > Megapixel Count, Sensor, Pixel Size, Focal Length | TechSpot](https://www.techspot.com/articles-info/850/images/Hero.jpg)