Question about Tamron Zoom Telephoto AF 70-300mm f/4.0-5.6 LD Macro Autofocus Lens for Canon EOS
Barrel turns but no effect.
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
A 35-80 mm lens is 2.3X zoom. Divide 80 by 35 and you'll get the result.
It is usually better to know what the focal length of a lens in "35 mm equivalent" is and judge by that, rather than relying on the "X" power of the lens. For instance, most point and shoot cameras start at about 35 mm and have either a 3X or 4X zoom. This would make it a 35-105 or a 35-140. I've seen some that start at 28 mm, though. A 3X starting at 28 mm is 28-84 and a 4X is 28-112. Neither one is a particularly strong telephoto lens and the 4X is just about the same as the 3X that starts out at 35 mm.
It's also important to realize that tradition dictates that lens focal lengths are usually expressed in terms of "35 mm equivalent," where "35 mm" refers to a 35 mm film camera. This is because of the relation between the sensor size and the actual focal length of the lens and the resultant angle of view of the lens.
I have one point & shoot that is actually a 5.8-24 mm zoom. This is a 4X zoom. The 35 mm equivalent is 28-116 mm. The sensor is 7.2x5.3 mm. (1/1.8") (And I wish I knew someone who could explain how the heck they came up with sensor size terminology!)
I have another point & shoot that is actually a 5.7-17.1 mm zoom. This is a 3X zoom. The 35 mm equivalent is 34-102 mm. "How could a shorter focal length give a longer 35 mm equivalent?" you might ask. It's because the sensor is only about 5x4 mm. (1/2.5")
I have a few Nikon DSLR's and - thankfully - they all have the same size sensor. They all have a "lens factor" of 1.5. This means that you just multiply the actual focal length of the lens to get the 35 mm equivalent and then you can make comparisons accurately from camera-to-camera. Most Canon's, for instance, have a lens factor of 1.6. On a Nikon DSLR, a 28 mm lens is the "35 mm equivalent" of a 42 mm lens. On most Canon DSLR's, the same 28 mm lens is the equivalent of a 45 mm lens.
These example are just to show you how freaking confusing it can all become if you try to make sense of the "X" power of a zoom lens.
Check the 35 mm equivalent specifications for the lens. This way, you will be leveling the field and comparing apples to apples. More or less.
Posted on Jul 10, 2012
Tips for a great answer:
Jan 23, 2015 | Nikon Cameras
Aug 31, 2014 | Tamron Cameras
May 27, 2014 | Canon EF-S 17-85MM F/4-5.6 IS USM Lens
Apr 18, 2012 | Nikon Af Nikkor 35-70mm F3.3-4.5 Camera
Oct 03, 2011 | Canon EOS Digital Rebel XS / 1000D IS...
Feb 02, 2011 | Cameras
Jan 20, 2011 | Cameras
Oct 09, 2009 | Sigma 24-70mm f/2.8 EX for Canon
Jun 09, 2017 | Tamron Autofocus 2x Teleconverter Lens for...
Sep 05, 2008 | Tamron 70-300mm f/4-5.6 Di Zoom Lens for...
34 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: