WPF - World Photography Forum
Home Gallery Register FAQ Calendar Search Today's Posts Mark Forums Read

Welcome to World Photography Forum!
Welcome!

Thank you for finding your way to World Photography Forum, a dedicated community for photographers and enthusiasts. There's a variety of forums, a wonderful gallery, and what's more, we are absolutely FREE. You are very welcome to join, take part in the discussion, and post your pictures!

Click here to go to the forums home page and find out more.
Click here to join.


Go Back   World Photography Forum > Photography Equipment > Lenses


Lenses Discussion of Lenses

canon 90-300?

Reply
 
Thread Tools
  #11  
Old 04-06-07, 22:45
Don Hoey's Avatar
Don Hoey Don Hoey is offline  
Senior Member
 
Join Date: Dec 2005
Location: Norfolk
Posts: 4,462
Default

Quote:
Originally Posted by crazee horse View Post
er............. whats APO?
I hope this link explains http://en.wikipedia.org/wiki/Apochromat

Don
Reply With Quote
  #12  
Old 04-06-07, 22:56
miketoll's Avatar
miketoll miketoll is offline  
Senior Member
 
Join Date: Dec 2005
Location: Suffolk
Posts: 7,477
Default

Quote:
Originally Posted by crazee horse View Post
er............. whats APO?
''Normal'' lenses are only designed to accurately focus one wavelength of light so on longer focal length lenses you can sometimes see the other colours around the edge of the focussed image (not the same as the purple fringing you get from the properties of the digital sensor but looks rather similar). More expensive telephotos or tele-zooms correct for this and are called apochromatic lenses. Sigma call their versions of this APO lenses. They produce sharper images but are more expensive. The effect does not show up on shorter focal length lenses under say 300mm. Hope this helps.
Reply With Quote
  #13  
Old 04-06-07, 23:00
miketoll's Avatar
miketoll miketoll is offline  
Senior Member
 
Join Date: Dec 2005
Location: Suffolk
Posts: 7,477
Default

Quote:
Originally Posted by Don Hoey View Post
I hope this link explains http://en.wikipedia.org/wiki/Apochromat

Don
By the time I had finished typing my message and posting it Don puts a much better answer up! Ah well .
Reply With Quote
  #14  
Old 05-06-07, 12:14
postcardcv's Avatar
postcardcv postcardcv is offline
Super Moderator
 
Join Date: Dec 2005
Location: Norfolk
Age: 48
Posts: 1,856
Default

Quote:
Originally Posted by crazee horse View Post
dare i say ive been looking at this............... http://cgi.ebay.co.uk/BRAND-NEW-SIGM...QQcmdZViewItem
I have used this lens and the APO version, if you can afford it the APO is a significantly better lens. The price of the one in the link is about what you should pay for it in a shop so have a look around before buying, the APO woud be ~£50 more.
Reply With Quote
  #15  
Old 05-06-07, 20:14
crazee horse's Avatar
crazee horse crazee horse is offline  
Member
 
Join Date: May 2007
Location: great britain
Posts: 37
Default

bugger, ive just bought the 70-300 hope im not dissapointed.....................
__________________
Weapons of choice,
Panasonic FZ8,
Canon 350d,Sigma 70-300 DG Macro
Serious? Me? Not in this lifetime.......
Reply With Quote
  #16  
Old 05-06-07, 21:19
miketoll's Avatar
miketoll miketoll is offline  
Senior Member
 
Join Date: Dec 2005
Location: Suffolk
Posts: 7,477
Default

Quote:
Originally Posted by crazee horse View Post
bugger, ive just bought the 70-300 hope im not dissapointed.....................
Let us know. I think it will be fine.
Reply With Quote
  #17  
Old 09-06-07, 00:00
Joe's Avatar
Joe Joe is offline  
Senior Member
 
Join Date: Jan 2007
Location: Manchester, United Kingdom
Age: 51
Posts: 1,586
Default

APO = Apochromatic
It basically means one or more glass elements within the lens is of a higher quality than a non APO lens. Sigma terminogy...other Sigma lens options (off the top of my head) the 70-300 offer both APO and non APO versions...about £50 difference in price. Well worth it if you're after the sharpest lenses. Nikon call the same sort of thing 'ED' (extra low dispersion glass), Tamron 'LD' (low dispersion)...etc ....
Pick up a free Jessops catalogue at your local shop, as there's some lens reference guides in there which explain those letters which make appearances on many lenses now.

I can't offer anything additional with regard to the above lens, but wife Jacky has a 100-300mm f/5.6 Canon lens, despite being quite noisy focusing mechanism, it is quick, and is quite a nice sharp one, particularly at the 300 end.
Reply With Quote
  #18  
Old 09-06-07, 00:05
Joe's Avatar
Joe Joe is offline  
Senior Member
 
Join Date: Jan 2007
Location: Manchester, United Kingdom
Age: 51
Posts: 1,586
Default

Ooops, sorry...didn't spot there was a second page to this thread!
Reply With Quote
  #19  
Old 09-06-07, 14:27
crazee horse's Avatar
crazee horse crazee horse is offline  
Member
 
Join Date: May 2007
Location: great britain
Posts: 37
Default

well for the last week ive watched the front door like a hawk, ready to pounce and snatch my lens out of the posties hands and snap away like a lunatic, i couldnt believe how long the lens is taking so i checked my inbox, and when i ordered it apparently i never specified canon fitment or a contact number so it hasnt even been dispatched yet! AAAAAAAAAAAAAAAAAAAAAAAGGGGGHHHHH!
__________________
Weapons of choice,
Panasonic FZ8,
Canon 350d,Sigma 70-300 DG Macro
Serious? Me? Not in this lifetime.......
Reply With Quote
  #20  
Old 10-06-07, 16:52
miketoll's Avatar
miketoll miketoll is offline  
Senior Member
 
Join Date: Dec 2005
Location: Suffolk
Posts: 7,477
Default

Well that gives you a chance to change your order to the APO version if you want to!
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

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 Off
HTML code is Off
Forum Jump


All times are GMT +1. The time now is 05:49.


Powered by vBulletin® Version 3.7.3
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.