Alley in Pisa, Italy

by Lars Kotthoff

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An optical 'zoom' or 'variable focal length' lens is one that has a range of focal lengths at which it can operate. "Digital zoom" is a technology which simulates optical zoom by cropping the image.

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5answers
1k views

How much different are the Tamron 17-50mm f/2.8 stabilized (VC) and non-stabilized versions?

I have seen these 2 lenses being suggested by many people across the site as general purpose zooms and an upgrade to the typical 18-55mm kit lenses. The price difference seems to be around $200 (~INR ...
6
votes
1answer
243 views

How many moving elements in a Canon A490?

I got mugged a few days ago, but got my camera back in the end. Bonus: I got some sand too. I now have the camera in pieces, cleaning them as I go along, and the lens barrel extends and retracts ...
5
votes
2answers
1k views

Is there a Tamron 70-200mm lens which is optically superior to the Canon 70-200 f2.8 IS?

In the June 2011's Popular Photography magazine (Canada, hard copy, pg. 90) in an article titled "Star Power", on a one page overview of the Canon 70-200mm f2.8L IS II USM, the author (Julia Silber) ...
5
votes
2answers
1k views

Tethering to Control Zoom on Nikon DSLR

Most Nikon DSLR have a tethered capture option, however I haven't come across any of them that controls the zoom of the DSLR. I guess the zoom is controlled manually by rotating the ring on the lens. ...
4
votes
3answers
971 views

Are prime lenses sharper than normal or telephoto zoom lenses?

Example: The prime lens Nikon 1.4F G is said to be very sharp at F3.5. So, if I compare that with the normal or telephoto zoom lens's F3.5, will the level of sharpness be same? If no, then will the ...
4
votes
5answers
1k views

Why does the quality of my pictures lower the more I zoom in?

I have a Canon 60D with the 18-200mm kit Lens. I was at the beach not too long ago, I took some pics of my son in the sand, from a very close distance and they came out great. Picture quality was top ...
3
votes
1answer
252 views

What do I need in order to mount my zoom lens onto a tripod?

I just purchased a cheap Opteka zoom lens and it is super long -- over two feet when fully elongated. It has built-in a tripod mount and I have no idea how to use it. I currently own a Vanguard ...
2
votes
0answers
753 views

Where can I compare telephoto zooms? 200 vs 300 vs 500 mm?

I have a 200mm telephoto zoom lens. I would like to see the zoom distance between the 200mm compared to 300mm and 500mm. Are there any sample comparison images anywhere I can look at?
0
votes
2answers
615 views

How does the Tamron AF 28-75mm f2.8 compare to Canon EF-S 15-85mm f/3.5-5.6 IS USM?

I am looking to buy a good walk around lens for t3i to finally upgrade from my kit lens. My current preference is Canon 15-85. however I am wondering if I should get Tamron AF 28-75mm f2.8. I am ...