Go Back   Steve's Digicams Forums > Digital SLR and Interchangeable Lens Cameras > Canon Lenses

Reply
 
Thread Tools Search this Thread
Old Dec 23, 2005, 1:52 PM   #1
Member
 
Join Date: Aug 2005
Posts: 49
Default

Hi everyone,

I just had a question about 2 possible lens combinations and wanted to see what the difference is.

A sigma 70-300mm apo dg macro does 1:2 macro @ 300mm. I think that if you added a 500d to this lens, it would do 1:1 macro.

Now, I've also seen some pictures from Macro lenses, for example the sigma 105 macro. Are these macros 1:1 or like 1:0.5 or something? How would a shot from a dedicated macro compare to a 70-300mm w/ canon 500d?

I also noticed that most macors have to be at a higher DOF to capture everything - so what is the advantage of a fast lens if most people use higher f/stop?

Thanks for the responses! Just like learning stuff!
Doug_M is offline   Reply With Quote
Sponsored Links
Old Dec 26, 2005, 9:13 AM   #2
Senior Member
 
sjburges's Avatar
 
Join Date: Aug 2004
Posts: 106
Default

> I also noticed that most macors have to be at a higher DOF to capture everything - so what is the advantage of a fast lens if most people use higher f/stop?

You are correct that stopping a lens way down is often useful for macro work to get a little (very little at 1:1) DOF to play with. Even at max f-stop, you're not going to "capture everything" at that magnification though - you need to be very aware of the focal plane when positioning/planning your macro shots.

The nice thing about having a f/2.8 lens is that you don't have to use it for only macro work - it works pretty well for general purpose shooting too. Macro lenses typically make for some very sharp images. However - at least on the sigma 105, the AF is pretty painfully slow, so perhaps its not your best choice for using it all the time.

sjburges is offline   Reply With Quote
 
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 8:07 PM.