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PostPosted: Thu Jul 18, 2013 11:52 am 
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Joined: Mon Jul 01, 2013 11:32 pm
Posts: 10
I just got this lens and was wondering if I should be using the "marco" setting on the camera or one of the other settings that allows changing of the focal setting to 2.5.

Are there instructions on the best use of this lens?

I am using this on a T3 Rebel.


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PostPosted: Sat Jul 20, 2013 12:29 pm 
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Joined: Mon Jul 01, 2013 11:32 pm
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[spammer] wrote:
i agreed with you


Huh?


Last edited by Bjorn van Sinttruije on Wed Jul 24, 2013 9:47 am, edited 1 time in total.
That was a spammer.


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PostPosted: Mon Jul 22, 2013 12:02 pm 
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Joined: Tue Jan 06, 2009 9:22 pm
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Location: Speyer (Germany)
Well... in Av you can set the camera to F2.5 but if you are shooting macro you will be going to use a higher F number.

_________________
Canon EOS 500D + Canon EOS 5D Mark III + Canon EOS 33v
Canon EF 28-80mm 3.5-5.6 USM + EF 24-105mm 4L IS USM + EF 100-400mm 4.5-5.6L IS USM + EF 50mm 1.8 II + EF 100mm 2.8L Macro IS USM + Sigma 12-24mm 4.5-5.6 EX DG HSM + Canon Speedlite 580 EX II + Nissin Speedlite Di 466


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PostPosted: Mon Jul 22, 2013 12:13 pm 
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Jiko wrote:
Well... in Av you can set the camera to F2.5 but if you are shooting macro you will be going to use a higher F number.


I thought the point of the Macro Lens was to get to the lowest F Number which meant the widest aperture?


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PostPosted: Mon Jul 22, 2013 1:15 pm 
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Location: Speyer (Germany)
No - if you are doing macro shots you already get a pretty damn shallow depth of field and stopping down you can get more.
Some examples: (Sorry, I only have the 100mm 2.8, not the 50mm 2.5 although that's on my list as a possible replacement for the 50mm 1.8 II)

Image
Canon EOS 500D
Canon EF 100mm 2.8L Macro IS USM
F2.8
ISO 100
1/500 sec
Only the eye is sharp and the rest of that little guy is out of focus.


Image
Canon EOS 500D
Canon EF 100mm 2.8L Macro IS USM
F5.6
ISO 100
1/200 sec
Here you can see it's much sharper - but still the depth of field is shallow enough to get a pretty blurred background.


Image
Canon EOS 500D
Canon EF 100mm 2.8L Macro IS USM
Canon Speedlite 580EX II (master)
Nissin Speedlite Di466 (slave)
F20
ISO 400
1/200 sec
The depth of field is getting pretty usable for macro work. But still the depth is not really big - at F20! Half the problem with the 50mm though. You are just loosing a lot of light.


And a last one...
Image
Canon EOS 33v
Canon EF 100mm 2.8L Macro IS USM
F22
Agfa APX 100
1/5 sec
No, I don't smoke, but the cigarette is almost completely in focus.


So the point of macro lenses is to get small things as big as possible and most of the time those lenses are pretty sharp. Most "portrait" lenses let more light through.
50mm 2.5 --> macro
50mm 1.8, 1.4, 1.2, 1.0 --> no macro
100mm 2.8 --> macro
100mm 2.0 --> no macro

_________________
Canon EOS 500D + Canon EOS 5D Mark III + Canon EOS 33v
Canon EF 28-80mm 3.5-5.6 USM + EF 24-105mm 4L IS USM + EF 100-400mm 4.5-5.6L IS USM + EF 50mm 1.8 II + EF 100mm 2.8L Macro IS USM + Sigma 12-24mm 4.5-5.6 EX DG HSM + Canon Speedlite 580 EX II + Nissin Speedlite Di 466


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PostPosted: Mon Jul 22, 2013 2:26 pm 
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Joined: Mon Jul 01, 2013 11:32 pm
Posts: 10
Thanks for the info. I will try some of these suggestions after work tonight. Then post the results.


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