Go Back   Steve's Digicams Forums > Digicam Help > General Discussion

Reply
 
Thread Tools Search this Thread
Old Jul 22, 2008, 5:37 PM   #1
Junior Member
 
Join Date: Jul 2008
Posts: 6
Default

I am rather confused on lenses. I have a 70-300 lens for my Nikon. I've seen other 70-300 lenses that are incredibly large. What's the difference? It seems to me that all 70-300 lenses would have the same reach? Am I wrong?

I'm obviously an amateur and have a way to go before understanding all the complexities of lenses. Does anyone know of a good website that gives a tutorial on how lenses work, which lenses are best used for particular situations, etc?
bill451 is offline   Reply With Quote
Sponsored Links
Old Jul 22, 2008, 6:37 PM   #2
Member
 
playa4real007's Avatar
 
Join Date: Mar 2008
Posts: 79
Default

I don't know about that specific issue you are asking for....but i learned some useful information about digital photography and using DSLR and about lenses from this community and couple of other websites:

http://www.usa.canon.com/content/reb...lxtlessons.htm
http://digital-photography-school.com/blog/
http://www.dpreview.com/learn/?/Glossary/
http://www.dslrtips.com/

and some information in other sites "google it" and you'll find plenty of useful sites, including this Forum.

I'm an Amateur too but learning

:idea:
playa4real007 is offline   Reply With Quote
Old Jul 22, 2008, 7:41 PM   #3
Senior Member
 
Join Date: Jun 2005
Posts: 804
Default

bill451, you're right that every 70-300 lens will have the same field of view, but that doesn't mean that they are all created equal.

Probably the single biggest factor determining the physical size of a particular lens is it's maximum aperture. An f/2 lens will need more glass than an f/4.5 lens of the same focal length.

Some other factors influencing size might be whether the lens focuses internally, whether it has built-in auto focus and/or image stabilization, the number of elements
and whether the lens is optimized for full-frame sensors (or film) or smaller sensors.

Grant
granthagen is offline   Reply With Quote
Old Aug 7, 2008, 1:11 PM   #4
Member
 
Join Date: Jul 2006
Posts: 91
Default

A (70 to 300mm) lens for a 35mm film camera will be larger than a lens with the same aperture and equivalent zoom and vew for a dSLR with a smaller than 35mm sensor.

(The former lens placed on the latter camera, if it fits, will give a different (narrower)view than the expected 70 to 300mm views.)

Digital camera hints: http://members.aol.com/ajaynejr/digicam.htm


ajaynejr is offline   Reply With Quote
Old Aug 7, 2008, 1:28 PM   #5
Senior Member
 
TCav's Avatar
 
Join Date: Sep 2005
Location: Washington, DC, Metro Area, Maryland
Posts: 13,544
Default

ajaynejr wrote:
Quote:
A (70 to 300mm) lens for a 35mm film camera will be larger than a lens with the same aperture and equivalent zoom and vew for a dSLR with a smaller than 35mm sensor.
Actually, no one makes a 70-300 that only works on an APS-C image sensor; they are all full frame lenses.

The only exception is the Olympus 70-300mm f/4.0-5.6, which is for the 4/3 mount. As it happens, however, that lens is bigger and heavier than 70-300 lenses for other dSLRs (and SLRs.)
TCav is offline   Reply With Quote
Old Aug 12, 2008, 4:38 PM   #6
Junior Member
 
Join Date: Jul 2008
Posts: 6
Default

Thank you for the helpful information!
bill451 is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 9:59 AM.