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New Contributor
Posts: 2
Registered: ‎02-27-2014

What exactly is the difference between these two lenses?

 

CanonEF-S 55-250mm f/4-5.6 IS STM Lens 
CanonEF-S 55-250mm f/4-5.6 IS II Lens 

I'm stuck between a rock, and not sure what my best option would be...any help is greatly appreciated!!! Cat Happy
Esteemed Contributor
Posts: 2,344
Registered: ‎11-14-2012

Re: What exactly is the difference between these two lenses?

The difference is in the type of motor used to focus the lens. The focus motor in STM lenses are more or less silent to the camera's audio system. This is important when shooting video but not for still photography. This may help.

 

http://photo.stackexchange.com/questions/24109/what-does-stm-mean-on-a-canon-lens

"A skill is developed through constant practice with a passion to improve, not bought."
Reputable Contributor
Posts: 745
Registered: ‎12-24-2013

Re: What exactly is the difference between these two lenses?

In addition to being "Silent", there are other important advantages to a "Stills" photographer with the STM version.

 

The STM AF motor changes the design of the entire AF assembly so it is now "Internal Focus" This means that the front element of the lens does not rotate or extend during focus. The focus ring also does not spin by itself during Auto Focus, and you can also make manual adjustments after focus has been achieved. 

 

The STM version has also been reported to be sharper than the non-STM version. 

 

These are all very good reasons to consider paying extra for the STM version. 

Mike Sowsun
S110, SL1, 80D, 5D Mk III
New Contributor
Posts: 2
Registered: ‎02-27-2014

Re: What exactly is the difference between these two lenses?

Thank you both...I knew it had to do with the internal focus. I'm self taught, and just looking at all my options. Thank you so much! 

Cat Very Happy

VIP
Posts: 11,666
Registered: ‎12-07-2012

Re: What exactly is the difference between these two lenses?

It is also somewhat faster focusing.

EOS 1DX and 1D Mk IV and several lenses!
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