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Frank Doorhof Sep 18, 2003 12:05 PM

Dillema with Macro lens, please help.........

I want to buy a perfect macro lens for my 10D, and I decided to get the Sigma 105EX Macro but I found out the Tamron is just as good and over here 110,00 cheaper.

I have a few questions.

My current lens will focus from 19" away the macro's from 11" away, that's not really shocking in difference.

The factor however is different 1:5 to 1:1, could someone please explain what to expect from such a macro lens ?

1:1 is real life the salesperson told me (over the phone), but when I look through my 28-105Sigma 2.8/4.5 I also see what I capture ???

I'm a bit stunned at the moment, please assist me.


Frank Doorhof Sep 19, 2003 1:29 PM

Bought the Tamron 90mm f2.8 Macro.

Looks AMAZING !!!
Expect pictures soon.


hodad66 Sep 19, 2003 5:32 PM

1:1 means that if you were shooting a penny (for instance) that the size of the penny capture would be the same size as the penny. Hard to imagine with a digital sensor so imagine a 35mm slide.
1:5 would give you a slide with a pic of a penny 1/2 size.
1:1 would give you a slide with a penny the true size of a penny.
you are twice as close & your grain / pixels are that much finer.
To my understanding
also a 180 macro will allow you to stay further from the subject ( just in case it might run away)

eric s Sep 19, 2003 5:59 PM

Another thing to consider is to use an extention tube. They reduce the close focusing of a lens. This allows you to use a lens which you already own and like (know its sharpness and other aspects) but use it for much closer photography.

This allows you to be futher away from your subject. Of course, long lenses can get in the way of flashes when used really close, so there is a downside (if the flash is mounted on the camera.)

Buying some are on my list of things to do.


Frank Doorhof Sep 20, 2003 6:14 AM

Because I had no bees and insects available and wanted to post something quick I took a shot of Joey our cat.
While it's in no way a perfect shot, the detail and contrast are jawdropping on my monitor, this betters the 70-210f2.8 from Sigma in normal mode (can't wait to macro with it).

On the web version ALOT of detail is lost, but still I have posted it.


I tried a close up filter on the Sigma 28-105 but it really was bad, I lost autofocus or it hunts like crazy, add another $ 150,00 and I got the Tamron, it WILL be used a lot in normal mode also I think :D.

hodad66 Sep 20, 2003 10:11 AM

I love that cat shot. He / she just knows they're cool! Super sharp.

Frank Doorhof Sep 20, 2003 10:16 AM

Wait untill you see the real JPEG :D.
Somehow converting to web really loses a lot of detail.


eric s Sep 20, 2003 11:33 AM

I have yet to learn why, but as a general rule macro lenses are always amazingly sharp. I don't know if its because of who they build the macro feature in... or that macro requires really good optics (so they just don't make soft/bad ones)?

But as a general rule, macro lenses are very sharp.

Nice cat. I think you chose a good (and cute) subject for your lens test.


Frank Doorhof Sep 20, 2003 1:59 PM

My son wouldn't sit still but still I love the outcome of the shot.
Hope you like it too.



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