mirage
Posts: 3612
Joined: Mon May 31, 1999 4:44 am

Sigma 4,5mm, Anyone?

Sun Mar 08, 2009 1:32 pm

Good day,

I made a search in the database for photos taken with the Sigma 4,5mm but didn't find any, anyone has experience with this lens? any samples available?

thanks
Luis
 
deaphen
Posts: 1090
Joined: Wed Jul 13, 2005 3:57 am

RE: Sigma 4,5mm, Anyone?

Sun Mar 08, 2009 2:20 pm

Not the 4.5, but i have the 8 and i love it! Very very much.

With the 4.5mm, on full frame body, expect pics like this:

http://farm3.static.flickr.com/2311/2213890569_a54931868d_o.jpg

***woman not included   ***

Regards
Nitin

[Edited 2009-03-08 07:21:20]
I want every single airport and airplane in India to be on A.net!
 
mirage
Posts: 3612
Joined: Mon May 31, 1999 4:44 am

RE: Sigma 4,5mm, Anyone?

Sun Mar 08, 2009 2:36 pm

Thanks, Nitin. So the original image is circular? I've heard CS4 can transform circular images like the above in "normal" images, any plugin needed for that?

Luis
 
deaphen
Posts: 1090
Joined: Wed Jul 13, 2005 3:57 am

RE: Sigma 4,5mm, Anyone?

Sun Mar 08, 2009 4:38 pm



Quoting Mirage (Reply 2):
Thanks, Nitin. So the original image is circular? I've heard CS4 can transform circular images like the above in "normal" images, any plugin needed for that?

Yes i have heard of such a plugin or program, not sure which one it is though.

Regards
Nitin
I want every single airport and airplane in India to be on A.net!
 
mirage
Posts: 3612
Joined: Mon May 31, 1999 4:44 am

RE: Sigma 4,5mm, Anyone?

Sun Mar 08, 2009 5:11 pm

Nitim, with the sigma 8mm you don't get circular images like the above from the sigma 4,5mm, right?

thanks
Luis
 
deaphen
Posts: 1090
Joined: Wed Jul 13, 2005 3:57 am

RE: Sigma 4,5mm, Anyone?

Sun Mar 08, 2009 6:00 pm



Quoting Mirage (Reply 4):
Nitim, with the sigma 8mm you don't get circular images like the above from the sigma 4,5mm, right?

You do if you have a full frame sensor camera.... mine is a 1.6x crop, and hence only the corners are blackened up.

Nitin
I want every single airport and airplane in India to be on A.net!
 
oly720man
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RE: Sigma 4,5mm, Anyone?

Sun Mar 08, 2009 6:29 pm

wheat and dairy can screw up your brain
 
mirage
Posts: 3612
Joined: Mon May 31, 1999 4:44 am

RE: Sigma 4,5mm, Anyone?

Sun Mar 08, 2009 7:28 pm

Thank you very much for your help, I'm not used to this ultra wide angle fisheye world  Smile

So, Nitin, if I understand well, you had to crop the original of this image to eliminate the black corners?


View Large View Medium
Click here for bigger photo!

Photo © Nitin Sarin - AirTeamImages



I'm making these questions because I'm undecided between the Canon 10-22, the Sigma 8mm
and the Sigma 4,5mm, trying to understand the fisheye circular images and fisheye non circular images.

Luis
 
deaphen
Posts: 1090
Joined: Wed Jul 13, 2005 3:57 am

RE: Sigma 4,5mm, Anyone?

Sun Mar 08, 2009 8:30 pm



Quoting Mirage (Reply 7):
So, Nitin, if I understand well, you had to crop the original of this image to eliminate the black corners?

Yup, here is the actual uncropped image.

http://i40.photobucket.com/albums/e213/deaphen/sigma8mmsample.jpg

Taken with the 50D.

Quoting Mirage (Reply 7):


I'm making these questions because I'm undecided between the Canon 10-22, the Sigma 8mm
and the Sigma 4,5mm, trying to understand the fisheye circular images and fisheye non circular images.

Understandable, i didnt know about the edge thing when i bought the lens, but now am totally used to it, ofcourse, you get programs which straighten out the picture.

Regards
Nitin
I want every single airport and airplane in India to be on A.net!
 
mirage
Posts: 3612
Joined: Mon May 31, 1999 4:44 am

RE: Sigma 4,5mm, Anyone?

Sun Mar 08, 2009 8:40 pm

Thanks for your help, Nitin, I wonder which lens gives more field of view, the Canon 10-22mm or the Sigma 8mm. The Sigma has less focal lenght but by cropping the corners it might be almost the same as the Canon 10-22, my guess only.

Luis
 
oly720man
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Joined: Fri May 21, 2004 7:13 am

RE: Sigma 4,5mm, Anyone?

Sun Mar 08, 2009 9:03 pm



Quoting Deaphen (Reply 8):
Yup, here is the actual uncropped image.

I think you were standing a bit further forward, in line with the seat with the black bag on it.
wheat and dairy can screw up your brain
 
deaphen
Posts: 1090
Joined: Wed Jul 13, 2005 3:57 am

RE: Sigma 4,5mm, Anyone?

Sun Mar 08, 2009 9:09 pm



Quoting Oly720man (Reply 10):
I think you were standing a bit further forward, in line with the seat with the black bag on it.

Yes, your quite right, that is my camera bag, and i was standing right next to it. But the wide angle aspect makes it look further away.

Quoting Mirage (Reply 9):
Thanks for your help, Nitin, I wonder which lens gives more field of view, the Canon 10-22mm or the Sigma 8mm. The Sigma has less focal lenght but by cropping the corners it might be almost the same as the Canon 10-22, my guess only.

Not quite sure about that, that fact is possibly true, never thought of that.

Regards
Nitin
I want every single airport and airplane in India to be on A.net!
 
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rg828
Posts: 568
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RE: Sigma 4,5mm, Anyone?

Mon Mar 09, 2009 3:33 am

I´m shopping for one as well, what I can figure from the images is that the 4.5mm fisheye gives a full circle image on a 1.6 crop sensor, while the 8mm fisheye gives a larger image with just the corners blacked out, like in Nitin´s image above.
Correct?

What confused me is that while both lenses technically cover 180 degrees, they have different focal lengths.
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