18-70 and 24-85 lens comparision

reno77 · 23rd August 2005

I did a comparision of the new 18-70mm and the old 24-85mm lenses.
Here is the scene being compared.

Comparision at F5.6
Left corner with 18-70

Left Corner with 24-85

At F8
Left Corner with 18-70

Left Corner with 24-85

Conclusion : 24-85 is sharper at 5.6, at f8 they are equal. Actually I found the 18-70 to be sharper by a hairline in some parts of the picture at f8. The 18-70 images are more red than the 24-85's and the 50mm's.Do the 24-85 and 50mm produce less red images to compensate for the red cast inherent in film pics?

TME · 23rd August 2005

Based on your pics, I think the 18-70 is actually sharper at f/8 while it is noticeably softer at f/5.6...

ratboy · 23rd August 2005

the left corners are all out of focus ?
think the focal point is on the building
also .. why is the plants darker in the 18-70 then the 24-85 : )

reno77 · 23rd August 2005

Yes the focal point is on the building, but at this distance the left corners should be in focus ( http://www.dofmaster.com/dofjs.html 75mm focal length, 250M dist ). So the blurness at the edges should be the same if the lenses are equally made.

Here's the same shot at f5.6 taken with the 50/1.7. All the pics were converted from RAW, no sharpening applied.

For the f5.6 shots, both shutter speeds are 1/100 but the iso for the 18-70 is 250 and the iso for the 24-85 is 200. So the 18-70 should be slightly brighter, guess the light level must have fallen from when the 24-85 pic was taken at 6.35pm and the 18-70 at 6.36pm

For the f8 comparison all settings are the same, 1/100 and iso 400.

Drudkh · 23rd August 2005

Great test for those who doubt the 18-70's performance!

erina · 25th August 2005

Originally Posted by Drudkh

Great test for those who doubt the 18-70's performance!

love the kit lens performance, at least i would say it is much better than canon kit lens 18-55mm... that sux....

denizenx · 30th August 2005

is it good? i realised it has no real time MF

deslim27 · 30th August 2005

Originally Posted by denizenx

is it good? i realised it has no real time MF

simi si realtime MF?

Drudkh · 30th August 2005

Originally Posted by deslim27

simi si realtime MF?

realtime MF i think exist in Canon or Nikon? during AF, you can just reach out on the focusing ring to adjust the focusing without switching to MF.
In 7D, we have a handy AF/MF button and also DMF when set the front-bottom knob to auto. not sure about 5D. but i think 5D should have DMF, even my A1 also have.

deslim27 · 30th August 2005

Originally Posted by Drudkh

realtime MF i think exist in Canon or Nikon? during AF, you can just reach out on the focusing ring to adjust the focusing without switching to MF.
In 7D, we have a handy AF/MF button and also DMF when set the front-bottom knob to auto. not sure about 5D. but i think 5D should have DMF, even my A1 also have.

SSM can do the same mah.

But 350D kit len also not USM mah. 18-55 is too short for casual use, 18-70 better

reno77 · 30th August 2005

There is DMF mode on D5 but you can only manual focus the lens once the autofocus is locked.

TME · 30th August 2005

What so difficult about pressing a button that toggles the camera between auto and manual focus? Frankly I rather disengage the motor from the lens cos there is less wear and tear on the gear system. Also if u really need to manual focus while auto focussing, I wonder if it would be better to go full manual focus anyway...

23rd August 2005	#1
reno77 Member Join Date: Jan 2002 Location: Bedok Reservoir Posts: 881	18-70 and 24-85 lens comparision I did a comparision of the new 18-70mm and the old 24-85mm lenses. Here is the scene being compared. Comparision at F5.6 Left corner with 18-70 Left Corner with 24-85 At F8 Left Corner with 18-70 Left Corner with 24-85 Conclusion : 24-85 is sharper at 5.6, at f8 they are equal. Actually I found the 18-70 to be sharper by a hairline in some parts of the picture at f8. The 18-70 images are more red than the 24-85's and the 50mm's.Do the 24-85 and 50mm produce less red images to compensate for the red cast inherent in film pics? Last edited by reno77; 23rd August 2005 at 08:51 PM.

23rd August 2005	#2
TME Senior Member Join Date: Jan 2002 Location: Clementi Posts: 6,188	Re: 18-70 and 24-85 lens comparision Based on your pics, I think the 18-70 is actually sharper at f/8 while it is noticeably softer at f/5.6...

23rd August 2005	#3
ratboy Member Join Date: Sep 2002 Posts: 702	Re: 18-70 and 24-85 lens comparision the left corners are all out of focus ? think the focal point is on the building also .. why is the plants darker in the 18-70 then the 24-85 : )

23rd August 2005	#4
reno77 Member Join Date: Jan 2002 Location: Bedok Reservoir Posts: 881	Re: 18-70 and 24-85 lens comparision Yes the focal point is on the building, but at this distance the left corners should be in focus ( http://www.dofmaster.com/dofjs.html 75mm focal length, 250M dist ). So the blurness at the edges should be the same if the lenses are equally made. Here's the same shot at f5.6 taken with the 50/1.7. All the pics were converted from RAW, no sharpening applied. For the f5.6 shots, both shutter speeds are 1/100 but the iso for the 18-70 is 250 and the iso for the 24-85 is 200. So the 18-70 should be slightly brighter, guess the light level must have fallen from when the 24-85 pic was taken at 6.35pm and the 18-70 at 6.36pm For the f8 comparison all settings are the same, 1/100 and iso 400. Last edited by reno77; 23rd August 2005 at 10:44 PM.

23rd August 2005	#5
Drudkh Senior Member Join Date: Mar 2004 Posts: 6,019	Re: 18-70 and 24-85 lens comparision Great test for those who doubt the 18-70's performance!

30th August 2005	#7
denizenx Senior Member Join Date: Feb 2002 Location: L2TPYSG Posts: 4,514	Re: 18-70 and 24-85 lens comparision is it good? i realised it has no real time MF __________________ "I'm... dreaming... of a wide... angle~ Just like the ones I used to know~"