Back/front focus why can't...

Dave in Wales

Dave in Wales

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Edit My Images
Yes
...the manufacturers get it right before it goes out of the door.

Never had this problem way-back-when, almost seems like a lottery to get a good one.

In camera adjustment is not the answer because it has to be adjused for 'each' lens.
It seems that the manufactures are saying 'We can't get it right now why don't you have a go'.
Technology, technology coming out of their ears and they can't with any certainty get a camera to focus properly, untill of course after it's sent back for adjustment.
They can predict to the inch where a shot is taken but not if it will be in focus

Angry from Wales

D in W
 
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Dave in Wales said:
...the manufacturers get it right before it goes out of the door.

Never had this problem way-back-when, almost seems like a lottery to get a good one.

In camera adjustment is not the answer because it has to be adjused for 'each' lens.
It seems that the manufactures are saying 'We can't get it right now why don't you have a go'.Technology, technology coming out of their ears and they can't with any certainty get a camera to focus properly, untill of course after it's sent back for adjustment.

Angry from Wales

D in W
Click to expand...

4.7 micron pixels with an actual flat sensor a a hundredth of a degree misalignment in the mount being enough to cause focus issues compared to tenths of millimetres and an irregular film plane. Compare what people were willing to print from 35mm to what is expected now. Go and look at photos from 20, 30, 40 years ago and see how many images were "critically sharp". See if it made any difference to the impact the images had.

The manufacturers can get it right first time by the way. You wouldn't be willing to pay the cost though :lol:
 
'Way back when' we never looked that closely.

I don't know about you, but modern AF is much more accurate than my manual focusing and 10x faster. Nine times out of ten, when folks post up their front/back focused examples here it turns out to be user error.

And what's wrong with in-camera microfocus adjustment? Takes five minutes, and then it's done.
 
Not all cameras have micro adjust. Does the micro adjustment adjust all across a zoom range for all subject to camera distances properly or is it a fixed percentage??

I've only noticed front or back focus when I've a) moved or b) subject has moved or c) picked a flattish surface rather than an edge as focus likes edges more. I also notice that continuous focus can be a problem as it can drift off more if I move without realising. I prefer single shot as I can lock it then recompose slightly and make sure it is sharp where I want it to be if using a shallow DOF.
 
That is just the accuracy you get from mass produces goods IMHO. The build quality of most canon (yes I include L lenses) and Nikon stuff is pretty good but there are a lot of plastic parts and stuff built to acceptable tollerances. The fact we have micro adjustment (my camera doesn;t though :( ) is just a best bodge/fix for the level of build quality we accept. If you want super accurate lenses people do build them, but be prepared to but a '0' on the end of the currently acceptable price tags!!
 
Vertigo1 said:
Micro-adjustment allows this.
Click to expand...

Indeed, and the camera will recognise the lens when you power up next time and automatically adjust for that same lens so once its programmed in you never need to adjust it again. All the other lenses are unchanged (unless you have adjusted any other lens and then it will recognise any other changes).

It's actually a very useful, and very clever feature.
 
Damn, I really wanted to chime in with this thread because it's my hobby horse also.

But - all these sensible facts have spoiled a really good grouse (OK, so it was educational).

Damn again.
 
odd jim said:
It's actually a very useful, and very clever feature.
Click to expand...

Yep - the only real problem with it is when using zoom lenses which require differing levels of adjustment depending on the focal length - then a compromise is necessary.
 
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