Free Shipping on ALL Products
camera reviewsbest cameraslens reviewsphotography tipscamera forumvideo toursphotography bookssupport me
It is currently Thu Jul 24, 2014 2:32 pm

All times are UTC




Post new topic Reply to topic  [ 7 posts ] 
Author Message
PostPosted: Mon Oct 08, 2007 12:52 am 
Canon 70-200mm f2.8 or f4? So is there really a $600-800 difference in quality? And Gordon are you going to do a video on them?


Top
  
 
PostPosted: Mon Oct 08, 2007 1:18 am 
Offline
Moderator
User avatar

Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9805
Location: UK
mlclark08 wrote:
Canon 70-200mm f2.8 or f4? So is there really a $600-800 difference in quality? And Gordon are you going to do a video on them?

There used to be an adage when grinding parabolic mirrors for reflecting telescopes that the difficulty increased in proportion to the cube of the diameter. Maybe the price difference between the f/4 and f/2.8 variants isn't too bad in light of that statistic?

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Top
 Profile  
 
 Post subject:
PostPosted: Mon Oct 08, 2007 1:22 am 
i'm sorry bob i'm just an average guy with a camera...any possibility you could translate that into english?


Top
  
 
 Post subject:
PostPosted: Mon Oct 08, 2007 6:39 am 
Offline
Site Admin
User avatar

Joined: Tue Nov 08, 2005 3:32 pm
Posts: 9962
Location: Queenstown, New Zealand
I wouldn't expect the f2.8 model to be better quality - in fact the f4 may give better quality. The difference in price though is for that extra stop in aperture. Is it worth 600-700 bucks extra? Only you can decide!

I love fast lenses, but unless I was a pro sports photographer (or an enthusiast with deep pockets), I think I'd go for the f4 model. Then the question would be IS or non-IS, as the latter is a bargain!


Top
 Profile  
 
 Post subject: Lost in Translation
PostPosted: Mon Oct 08, 2007 8:33 am 
Offline
Moderator
User avatar

Joined: Sat Sep 30, 2006 4:30 pm
Posts: 9805
Location: UK
mlclark08 wrote:
i'm sorry bob i'm just an average guy with a camera...any possibility you could translate that into english?

Sorry, it was a bit late when I composed the reply. Reflecting telescopes use a mirror instead of a lens to focus the light so the surface has to be ground to a precise shape. If you double the size of the mirror then, for the amateur grinder at least, the difficulty of getting the precise figure isn't four times harder (the area is four times bigger) but eight times harder. I was just trying to make the point that similar logic applies to lens grinding though maybe not to such a degree with automatic machinery. The fact that faster lenses sell slower :roll: doesn't help their prices either.

Bob.

_________________
Olympus OM-D E-M1 + M.Zuiko Digital ED 12-40mm f/2.8, Lumix 7-14mm f/4, Leica DG Summilux 15mm f/1.7 ASPH, M.Zuiko Digital 45mm 1:1.8, M.Zuiko Digital ED 75mm 1:1.8.
Leica D Vario-Elmar 14mm-150mm f/3.5 - f/5.6 ASPH.
OM-D E-M5, H-PS14042E, Gitzo GT1541T, Arca-Swiss Z1 DP ball-head.
Astrophotography: TEC 140 'scope, FLI ML16803 camera, ASA DDM60 Pro mount.


Top
 Profile  
 
 Post subject:
PostPosted: Mon Oct 08, 2007 3:34 pm 
excellent thankyou bob that makes a bit more sense, and thank you Gordon, my brother has the 2.8 so i think i'll wait till i see him and test it out.


Top
  
 
 Post subject:
PostPosted: Mon Oct 08, 2007 8:29 pm 
Offline
Site Admin
User avatar

Joined: Tue Nov 08, 2005 3:32 pm
Posts: 9962
Location: Queenstown, New Zealand
That's an excellent opportunity - always good to try before you buy, especially on such a pricey bit of kit...


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 7 posts ] 

All times are UTC


Who is online

Users browsing this forum: Bing [Bot] and 3 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  

All words, images, videos and layout, copyright 2005-2012 Gordon Laing. May not be used without permission.
/ How we test / Best Cameras / Advertising / Camera reviews / Supporting Camera Labs

Webdesign by Alphabase IT
Powered by phpBB® Forum Software © phpBB Group