5-axis stabilization

[revolver4711]

Hi,

 

I have a new A7M2.  I purchased a 18 year old Leica 35-70mm F4 Macro/Zoom lens.  My question is, I will use this for traveling, generally street shots.  I know that I should manually adjust the IBIS to the exact lens size, but at any given point that could change from a 35MM through to 70mm.  I would rather not continually adjust the IBIS.  What would be the difference or problem if I left it set at 70MM verses 35MM or maybe 50MM?  I have searched for an answer, but have found nothing close to answering this question.

 

Thank you,

[Dr. Harout]

You will get blurry images. You have to set the exact focal length.

[Guest all8]

Hi,

 

I have a new A7M2.  I purchased a 18 year old Leica 35-70mm F4 Macro/Zoom lens.  My question is, I will use this for traveling, generally street shots.  I know that I should manually adjust the IBIS to the exact lens size, but at any given point that could change from a 35MM through to 70mm.  I would rather not continually adjust the IBIS.  What would be the difference or problem if I left it set at 70MM verses 35MM or maybe 50MM?  I have searched for an answer, but have found nothing close to answering this question.

 

Thank you,

 

 

Why don't you just try it for each setting and see if you can notice a difference? Then you can answer the question yourself, and feel awesome about it     

 

Don't forget to share your findings ... 

[Guest all8]

Oh, and see if you can assign the settings to the Memory positions, because that could be an easy way to manage the change.

[Username]

If you set the FL too high the IBIS will over react ... moving 

to much and almost guaranteeing some degree of blur. It 

is safe to set the shortest FL of the zoom range. You will get 

the full benefit at the short end of the zoom and a reduced 

benefit as you lengthen the FL without readjusting the IBIS 

setting. There would be some benefit but less and less as 

you zoom out. If you have a steady hand, the lesser effect 

is still helping out a bit. At least it won't introduce extra blur 

actually caused by the IBIS action. It's when you set the FL  

too long/high then you would get extra blur, caused not by 

your hand tremors but by the excessive travel of the IBIS 

mechanical action.  

   

So:  

1. Exact FL setting is ideal. 

2. Too short/low FL setting is safe, but reduces IBIS benefit. 

3. Too long/high FL setting is not safe, introduces added blur.   

    

Basically, using a  non-FL-communicating zoom is tedious 

but still more convenient than carrying more lenses, and it 

keeps the sensor cleaner than swapping lenses all the time. 

  

You hafta remember to set FL all the time. OTOH, if you're 

always juggling lenses, lens caps, and fighting dust [cuz you 

swap lenses] all that juggling is verrrrry likely to distract from 

remembering to reset the FL for the IBIS. So, zooming is not 

less convenient than it used to be [pre-IBIS], but IBIS is less 

convenient when not using an FL-communicating lens.