Effective Focal Length in camera lens vs telescope

7 years 4 weeks ago #521288 by Mike Ayrouth
You have a 85mm lens for your camera, the focal length is 85mm.  Pretty simple.  So help me understand how for example this 80mm solar telescope ( www.daystarfilters.com/Scout/80Scout.shtml ) is 80mm yet has 1400mm Effective Focal Length?

Getting BETTER one photo at a time!
Photo Comments
,
7 years 4 weeks ago #521326 by Robert Chen
Pretty good article that should help you out  www.skyandtelescope.com/astronomy-equipm...escope-buying-guide/

Nikon D300 24-70mm f2.8
70-200mm f2.8
50mm f1.4 & 50mm f1.8
105mm f2.8
2 SB800

Photo Comments
,
7 years 4 weeks ago #521336 by KCook
The objective of the telescope has a diameter of 80mm, not a focal length of 80mm. It is more common to refer to telescopes by their aperture (absolute) than their focal length. Different from the practice for camera lenses.

toomanytelescopes

Canon 50D, Olympus PL2
kellycook.zenfolio.com/

,

817.3K

241K

  • Facebook

    817,251 / Likes

  • Twitter

    241,000 / Followers

  • Google+

    1,620,816 / Followers

Latest Reviews

Nikon’s retro-looking Nikon Zfc is anything but retro. Under its classic body is a host of features and amenities that make it a worthwhile compact mirrorless camera for 2024.

Apr 15, 2024

The Canon EOS R50 is one of the newest R-system cameras from Canon. Is it worth your money? Find out all the details you need to know in this comprehensive review.

Apr 10, 2024

The Sony FE 70-200mm f/2.8 GM OSS II is Sony’s flagship mirrorless zoom lens. As such, it’s loaded with features and has a top-shelf build quality that makes it a top pick!

Mar 27, 2024

The Leica SL2-S is an attractive, premium mirrorless camera with photo and video specs that are sure to impress. And with the legendary Leica name, you know this camera exudes quality!

Mar 26, 2024
Get 600+ Pro photo lessons for $1

Forum Top Posters

Latest Articles

Are you ready to upgrade your camera? Before buying new, you might consider the value of purchasing used gear to save money.

Apr 18, 2024

The Olympus OM-D E-M10 Mark IV is a micro four thirds camera released in 2020. It’s an entry-level system along with the OM-D E-M5 Mark III. Use this guide to determine which one is best for you!

Apr 17, 2024

Blue hour photography might not be as well known as golden hour photography, but it is every bit as good a time to create epic images of landscapes. Learn how in this quick tutorial!

Apr 17, 2024

Nikon’s retro-looking Nikon Zfc is anything but retro. Under its classic body is a host of features and amenities that make it a worthwhile compact mirrorless camera for 2024.

Apr 15, 2024

Moving from taking snapshots of your dog to creating beautiful images doesn’t have to be that difficult! Use the tips outlined in this dog photography guide, and you’ll get better results in no time.

Apr 15, 2024

Acrylic print photos are a beautiful way to display your favorite images. But they don’t come without some questions. Get all the answers you need about this medium in this guide!

Apr 15, 2024

Where do you get your landscape photography inspiration? Is it from masters like Ansel Adams? Or perhaps viewing art from other genres? We’ve got these and a few other sources for you to check out!

Apr 10, 2024

The Canon EOS R50 is one of the newest R-system cameras from Canon. Is it worth your money? Find out all the details you need to know in this comprehensive review.

Apr 10, 2024