CA on 100 macro 2.8

htthach · 14th December 2006

Hi
I've just bought a canon 100mm macro lens and discover that there is a lot of CA.
both cyan and magenta.
Is it common in 100mm macro or mine is a bad copy

dundee · 14th December 2006

Originally Posted by htthach

Hi
I've just bought a canon 100mm macro lens and discover that there is a lot of CA.
both cyan and magenta.
Is it common in 100mm macro or mine is a bad copy

It may be sensor blooming and not CA. try shooting a high contrast shot without over-exposure (225, 225, 225) and see if you still get CA.

http://www.fredmiranda.com/reviews/s...at=2#poststart

It doesnt look like CA is a common problem with this lens thou, perhaps you could test another copy of the lens and see if u get the same problem?

Denosha · 14th December 2006

Never had any problems with CA on my copy. Maybe one of the elements in your lens is slightly out of whack?

http://www.sgl.per.sg/users/denosha/...tted_dove_nest
This was shot wide open on the 100mm macro and as you can see it was heavily back lit which should have created problems with CA but didn't.

htthach · 14th December 2006

how about u help me take some picture of shiny metal object with flash or spot light?
i took macro shot of my headphone with flash.
The metal screen got extreme CA that it looks like diamon screen look very funny
but if turn off the flash then not much CA.
for backlit also not much.
I took shot of golden ring under spot light also CA.

Denosha · 15th December 2006

Ok. Did some test shots for you. Wide open with light from a table lamp. There is some CA but it's really not that bad considering the situation and the fact that the lens is wide open (should improve when stopped down).

100% crop:

htthach · 15th December 2006

there ! the Magenta CA
very irritating right?

Denosha · 15th December 2006

If you think that's bad you should see the 35L wide open. =^/

Anyway, this sort of thing should go away once you stop down and it can also be corrected in PS. :P

htthach · 15th December 2006

tonight i show u mine.
look very funny haha

htthach · 15th December 2006

here is my diamon ipod headphone

Flash version

100% crop flash version

normal version

100% crop normal version

Denosha · 15th December 2006

Lol. Really looks like diamonds what. =^p Eh, convert to B&W maybe looks nicer? You can also try to shoot with the flash off the camera so that you don't get a direct reflection off the shiny surface.

htthach · 15th December 2006

i can take that picture of my headphone and sell the headphone for $1000 haha

14th December 2006	#1
htthach Member Join Date: Feb 2006 Location: dover Posts: 1,055	CA on 100 macro 2.8 Hi I've just bought a canon 100mm macro lens and discover that there is a lot of CA. both cyan and magenta. Is it common in 100mm macro or mine is a bad copy

14th December 2006	#3
Denosha Member Join Date: Dec 2003 Location: Bukit Timah Posts: 1,298	Re: CA on 100 macro 2.8 Never had any problems with CA on my copy. Maybe one of the elements in your lens is slightly out of whack? http://www.sgl.per.sg/users/denosha/...tted_dove_nest This was shot wide open on the 100mm macro and as you can see it was heavily back lit which should have created problems with CA but didn't. __________________ My Photo blog \| Photo gallery \| My music profile

14th December 2006	#4
htthach Member Join Date: Feb 2006 Location: dover Posts: 1,055	Re: CA on 100 macro 2.8 how about u help me take some picture of shiny metal object with flash or spot light? i took macro shot of my headphone with flash. The metal screen got extreme CA that it looks like diamon screen look very funny but if turn off the flash then not much CA. for backlit also not much. I took shot of golden ring under spot light also CA.

15th December 2006	#5
Denosha Member Join Date: Dec 2003 Location: Bukit Timah Posts: 1,298	Re: CA on 100 macro 2.8 Ok. Did some test shots for you. Wide open with light from a table lamp. There is some CA but it's really not that bad considering the situation and the fact that the lens is wide open (should improve when stopped down). 100% crop: __________________ My Photo blog \| Photo gallery \| My music profile

15th December 2006	#6
htthach Member Join Date: Feb 2006 Location: dover Posts: 1,055	Re: CA on 100 macro 2.8 there ! the Magenta CA very irritating right?

15th December 2006	#7
Denosha Member Join Date: Dec 2003 Location: Bukit Timah Posts: 1,298	Re: CA on 100 macro 2.8 If you think that's bad you should see the 35L wide open. =^/ Anyway, this sort of thing should go away once you stop down and it can also be corrected in PS. :P __________________ My Photo blog \| Photo gallery \| My music profile

15th December 2006	#8
htthach Member Join Date: Feb 2006 Location: dover Posts: 1,055	Re: CA on 100 macro 2.8 tonight i show u mine. look very funny haha

15th December 2006	#9
htthach Member Join Date: Feb 2006 Location: dover Posts: 1,055	Re: CA on 100 macro 2.8 here is my diamon ipod headphone Flash version 100% crop flash version normal version 100% crop normal version Last edited by htthach; 15th December 2006 at 09:36 PM.

15th December 2006	#10
Denosha Member Join Date: Dec 2003 Location: Bukit Timah Posts: 1,298	Re: CA on 100 macro 2.8 Lol. Really looks like diamonds what. =^p Eh, convert to B&W maybe looks nicer? You can also try to shoot with the flash off the camera so that you don't get a direct reflection off the shiny surface. __________________ My Photo blog \| Photo gallery \| My music profile

15th December 2006	#11
htthach Member Join Date: Feb 2006 Location: dover Posts: 1,055	Re: CA on 100 macro 2.8 i can take that picture of my headphone and sell the headphone for $1000 haha