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Lens Calibration/micro Adjustment...


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#1 Happy Grumpz

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Posted 11 February 2016 - 04:45 AM

Hey everyone.

 

When I bought my Sigma 150-600 I bought the USB dock to go with it.

 

Yesterday I decided to calibrate/micro adjust the focus. It's done using the bundled software and lets you micro adjust for 16 different places

 

150mm at 6m - 12m - 15m & infinity

 

Then you do the same for 300mm etc

 

The 1st 3 are easy, I put a tape measure out, marked the ground then put out a home made focus calculator at the set distances.

 

My question is (this is going to sound stupid) how the hell would I do that for infinity?

 

Calibration wise, does this have a set distance as to which it becomes 'infinity'?

 

I focused on an object about 40m away and I had some serious back focusing.

 

 


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#2 JestePhotography

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Posted 12 February 2016 - 03:16 AM

Set up on something 200 yards away.
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#3 Happy Grumpz

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Posted 12 February 2016 - 03:09 PM

Set up on something 200 yards away.

 

I'll give that a try, cheers :)


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#4 JestePhotography

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Posted 12 February 2016 - 04:00 PM

Honestly though you should contemplate the most used mm and your most often lens to object distances and dial those in.
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#5 JBGreene

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Posted 17 February 2016 - 04:28 AM

So if you adjust this on one lens does it throw others off? I feel like some of mine be a tad bit off.



#6 Happy Grumpz

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Posted 17 February 2016 - 04:41 AM

So if you adjust this on one lens does it throw others off? I feel like some of mine be a tad bit off.

 

I'm not sure how it works on the Nikon or Sony.

 

On Canon (or at least the higher end ones) you can micro adjust each lens at both the wide and zoom end. When I had my 24-70 on my 70D, it needed a slight adjustment at 70mm. The camera saves the adjustments for each individual lens.

 

The Sigma is slightly different, if you buy the USB dock you can micro adjust at 4 different distances within 4 mm ranges. These settings are then saved to the lens. 

 

Mine was out by a long way at 600mm. from a setting of -20 to Zero to +20, mine is now adjusted to -11 for infinity at 600mm.


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#7 Roderick

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Posted 17 February 2016 - 09:29 AM

Hi JB.

I've been sniffing around this software for a while but haven't bought it (yet).

http://www.reikan.co...serAssistedMode



#8 JBGreene

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Posted 20 February 2016 - 06:48 AM

Looks cool but seems it doesn't currently support Sony 



#9 Roderick

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Posted 20 February 2016 - 08:09 AM

Sorry, you're right!

I forgot you have the A7R2

I don't know if you can use it in manual mode on a Sony, but then, why buy it at all ?

Oh well....



#10 PeterPP

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Posted 18 March 2016 - 11:28 AM

If you need infinity focus go out at night and shoot the moon!

It is a big, bright and far away target.


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#11 Happy Grumpz

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Posted 18 March 2016 - 12:40 PM

If you need infinity focus go out at night and shoot the moon!

It is a big, bright and far away target.

 

 

That's what I ended up doing :)


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#12 JBGreene

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Posted 18 March 2016 - 04:07 PM

Video from matt Granger about it 


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