Focusing issue at infinity.


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yamapi

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Feb 27, 2008
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#1
Realised that my M42 lens has issue when focusing at inifity,subject which are more than 1metres away cannot be focused.
I'm using the M42 adaptor for sony/minolta and various cause of the problem i heard is that this common issue is attributed to the thickness of the M42 adaptor.
Have actually gotton some advises from other bros but i would like to understand more.

Do I
1)sandpaper it which i heard is being done by certain people..messy job though.
2)get a more expensive adaptor...they are more expensive for a reason right?




From your friendly dotaboy
:lovegrin:
 

zj2000

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Mar 10, 2007
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#2
You don't need an expensive adapter, just check when you are buying to make sure. Normally how i check is I bring the shortest lens that I have and I try to focus on something at infinity / close to infinity to see wether it can be done..... It is important that you use a short lens since the impact of extra thickness is pronounce with shorter lenses but you might not notice it if you're using a 200mm say.... If you've used extension tubes before you'll understand what i mean, a bit hard to put it in to words...

My advice is not to bother with sanding it since a new one is so cheap ($45 i think) and it will introduce a whole different set of problems... ie one side of adapter might be thicker than the other, if that happens your lens will behave like a tilt shift lens (impact is minor but noticeable).... just make sure you check before u buy..
 

Del_CtrlnoAlt

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Feb 15, 2003
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#3
the best adaptor is one without the plate, can have a 3rd party lens with a direct mount or one that modify its rear structure to fit with your mount, unless can do own machining, you can try to make a M42 to your mount without that piece of metal ring. probably when i got time to do measurement then i'll see if can do or not, else no point also... not worth it...
 

yamapi

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Feb 27, 2008
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#4
Lense is 50mm F1.4.
Apart from an adaptor which i have atm moment,there was one shop that i asked and he qouted me $90.
Too much to pay?
 

yamapi

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Feb 27, 2008
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#7
the best adaptor is one without the plate, can have a 3rd party lens with a direct mount or one that modify its rear structure to fit with your mount, unless can do own machining, you can try to make a M42 to your mount without that piece of metal ring. probably when i got time to do measurement then i'll see if can do or not, else no point also... not worth it...


care to elaborate what you meant by plate?
 

zj2000

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Mar 10, 2007
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#8
Go to orient photo... i know they have a lot of m42 to canon.... not sure if they have an m42 to alpha mount..... pricewise is half of what that other shop quoted you.... let me guess P&_?
 

yamapi

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#9
Go to orient photo... i know they have a lot of m42 to canon.... not sure if they have an m42 to alpha mount..... pricewise is half of what that other shop quoted you.... let me guess P&_?
Pmed you.
 

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