Canon 70-200 f2.8L

Post by **rcj** » Mon Feb 18, 2008 10:18 pm

think will give the lens a miss. The astrophotography capability of the lens is not that good too.

See some reference test shots:

http://www.pbase.com/terrylovejoy/70_200

All taken at F2.8. Perhaps it is superb for terrestrial photography, but imaging stars (which are point sources) derives much greater demand on lens performance (center to edge). One can consider stopping down, to improve the lense performance, but the initial basic premise of thought put into this lens is that it would perform well, wide opened, and have high photon-injection rate at f2.8.

sigh!

Post by **weixing** » Tue Feb 19, 2008 12:08 am

Hi,
I thought you only want to use it for terrestrial photography.

Anyway, after I saw the Canon Astrophotography website, I realised that zoom lens will not be as good as I thought for Astrophotography at wide open even using the Canon L lens.

The Canon Astrophotography website show various images taken with Canon DSLR and some with their L prime lens. They also show the the sharpness of the edge improve as they stop down the Canon EF24 mm f/1.4L USM lens and recommend to take some test shot to check and stop down if necessary... they recommend to stop down 2 stop (from f1.4 to f2.8) for the Canon EF24 mm f/1.4L USM lens... they are really honest... ha ha ha

So if stop down may be require for the L prime lens, I think you need to stop down further if using the zoom lens.

By the way, I think their L prime lens are quite good for Astrophtography and the Astrophotograph taken with it in the Canon website are very beautiful even at wide open... too bad they remove the Astrophotography section from their new EOS website. Lucky, I "backup" it long ago... hee hee

Have a nice day.

Sam Lee · Post by **Sam Lee** » Tue Feb 19, 2008 12:22 am

Remus , have you tried the 300 F4L version ?
It doesn't have as much distortions as the 70-200 versions.

Tachyon · Post by **Tachyon** » Tue Feb 19, 2008 8:28 pm

I am saving up for the Canon EF 100-400mm f/4.5-5.6L IS USM. Akan datang!

MooEy · Post by **MooEy** » Tue Feb 19, 2008 9:30 pm

eee, so many canon user here. dangerous. i guess i'm the only one from the dark side.

~MooEy~

Clifford60 · Post by **Clifford60** » Tue Feb 19, 2008 9:42 pm

Me dark side too, I know Wu from dark side too. So, you are not alone.

kayheem · Post by **kayheem** » Tue Feb 19, 2008 10:26 pm

Of course lah! All those in the dark side can't see each other! :-)

swimaniac · Post by **swimaniac** » Tue Feb 19, 2008 10:45 pm

Come into the light. You won't regret it!

wucheeyiun · Post by **wucheeyiun** » Tue Feb 19, 2008 11:02 pm

yes, dark is good...darker the better, can see more stars also

D200 + 17-55 f2.8 will get you this.....

more here....
http://www.clubsnap.com/forums/showthre ... ght=wucy24

MooEy · Post by **MooEy** » Tue Feb 19, 2008 11:15 pm

somehow i like the choices of lens on the dark side. 18-200vr *drool*

~MooEy~