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Need A Good 600mm Zoom For My Canon  
User currently offlineLMML 14/32 From Malta, joined Jan 2001, 2565 posts, RR: 6
Posted (10 years 11 months 3 weeks 2 days 5 hours ago) and read 3865 times:

I am presently using a 2x converter on my 300mm zoom. There are two problems with this combination: Auto Focusing and f-stop penalty. Can you suggest an inexpensive alternative with a Canon mount?

7 replies: All unread, jump to last
 
User currently offlineWietse From Netherlands, joined Oct 2001, 3809 posts, RR: 55
Reply 1, posted (10 years 11 months 3 weeks 2 days 5 hours ago) and read 3860 times:

Nope..

either the 300mm F4L IS with a 2x convertor for about 2000 euros or go the Sigma way.

A straight 600mm lens is very expensive...

Wietse



Wietse de Graaf
User currently offlineCkw From UK - England, joined Aug 2010, 740 posts, RR: 16
Reply 2, posted (10 years 11 months 3 weeks 2 days 5 hours ago) and read 3852 times:

Well you could go for the 300 f2.8 LIS - but hardly inexpensive. What you're looking for is a 600mm lens with an aperture of at least f5.6. Nobody makes these for less than the price of a car.

Cheers,

Colin



Colin K. Work, Pixstel
User currently offlineWietse From Netherlands, joined Oct 2001, 3809 posts, RR: 55
Reply 3, posted (10 years 11 months 3 weeks 2 days 5 hours ago) and read 3847 times:

Or go check mirror lenses, but you will hardly find them below f8, and quality is very marginal...

Wietse



Wietse de Graaf
User currently offlineCkw From UK - England, joined Aug 2010, 740 posts, RR: 16
Reply 4, posted (10 years 11 months 3 weeks 2 days 3 hours ago) and read 3815 times:

... and no AF

Cheers,

Colin



Colin K. Work, Pixstel
User currently offlineLMML 14/32 From Malta, joined Jan 2001, 2565 posts, RR: 6
Reply 5, posted (10 years 11 months 3 weeks 1 day 8 hours ago) and read 3746 times:

It's almost impossible then. Does anyone use a Canon 300mm with a 2x converter? I have trouble focusing. The only way to AF is to select either of the extreme focus points manually and pre focus on a point. It is impossible to us AF when pressing the trigger. The lens will just go hunting.

User currently offlineMirage From Portugal, joined May 1999, 3125 posts, RR: 14
Reply 6, posted (10 years 11 months 3 weeks 1 day 8 hours ago) and read 3724 times:

it's normal, I was using an EF 75-300 IS sometimes with the Canon 2x but it's like you said, lots of trouble, out of 10 photos maybe one satisfactory and never razor sharp images, always a compromisse between long range and average quality.

Luis


User currently offlineCkw From UK - England, joined Aug 2010, 740 posts, RR: 16
Reply 7, posted (10 years 11 months 3 weeks 1 day 2 hours ago) and read 3680 times:

I use a 300mm f4 with 2x (and sometimes 2x & 1.4x convertors) and just use manual focus - at long focual lengths, I don't find manual focus too much of a problem as the difference between in focus and out of focus is readily apparent. Try using MF for a while - a little practice and you'll be fine.

Cheers,

Colin



Colin K. Work, Pixstel
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