Exposure points - daft question


andyvarney

Link Posted 05/03/2010 - 09:34
I have been wondering for a while:

When I set the focus point to sel on my K20D and the exposure to spot, does the camera still take the exposure reading in the centre or where the focus point is selected?

I have looked in the manual and can't find it.

Andy
It's not the size of the dog in the fight, but the size of the fight in the dog!

DoctorJeff

Link Posted 05/03/2010 - 10:17
What a question, Andy (and not a nice thing to do to an old person!)
I relied on having a centre AF point and centre spot for metering for hand-held shots of the birds in our garden. Your question made me wonder.
So, out comes the K200D manual (again ) and the K20 may be different ...
- Setting Spot Metering measures the center of the viewfinder. That's clear enough.
- Using Select AF Point lets one choose the AF point but does not alter the choice of Spot metering. That's clear enough as well.
Conclusion - I'm all right.
I find a setting that allows Linking Exposure to AF Point, which seems to do what you want to do, down in the Custom Settings Menu, and with a default of OFF. Does the K20 offer you this?
So now you have made me wonder if I need to re-evaluate my choice of settings for more general work - and if so, what do I use? Thank you for that.
Water can wear away a stone - but it can't cook lunch
X-5
istDS
K2000
P50.
Lenses Digital: 50-200, 18-55 KAF: 28-80.
Lenses KA & K: SMC-KA f2.0, SMC-K f1.4, SMC-K f1.7 Tokina KA 28-70 , SMC Pentax 70-210 F4, Sigma KA 75-300 , Hanimex 500mm Mirror, and the Tamron Adaptall-2 stuff.
and then there's all the M42 kit, and the accessories ...

bforbes

Link Posted 05/03/2010 - 10:32
"Link AF point to AE" is in the custom menu of the K20
Barrie
Too Old To Die Young

http://www.pentaxphotogallery.com/artists/barrieforbes
https://www.flickr.com/photos/189482630@N03/

iceblinker

Link Posted 05/03/2010 - 10:36
Spot metering is always done at the centre of the screen only. And Centre-Weighted is always weighted for the centre only.

Link AE to AF Point relates only to multi-segment metering. I can't remember exactly what it does, except that it doesn't do what you might think it does!
~Pete

stu49

Link Posted 05/03/2010 - 10:40
I would expect it to bias exposure towards chosen focus point !? No ??
.

Stu - K10D | DFA 100/2.8 Macro | DA 55-300 | AF-360FGZ |

So much to learn... So little time !

asview

Link Posted 05/03/2010 - 10:45
standard procedure when you are taking a shot in SEL..focus would be to the nearest subject.

metering in spot mode would be as the box says...spot meter of that nearest subject.

in custom menu..6 you can lock the AE with the focus point or you can leave it off which means metering as normal.

custom menu..7 gives metering choices to multi- segment mode only and works similar to menu..6.

I find using centre focus point works better for me in most situations.

just my take on your query.

regards

albert

iceblinker

Link Posted 05/03/2010 - 10:54
stu49 wrote:
I would expect it to bias exposure towards chosen focus point !? No ??

I have a vague memory that the answer to that is "no". Let's see if anyone knows for sure what it does......
~Pete

stu49

Link Posted 05/03/2010 - 11:01
asview wrote:
standard procedure when you are taking a shot in SEL..focus would be to the nearest subject.

metering in spot mode would be as the box says...spot meter of that nearest subject.

in custom menu..6 you can lock the AE with the focus point or you can leave it off which means metering as normal.

custom menu..7 gives metering choices to multi- segment mode only and works similar to menu..6.

I find using centre focus point works better for me in most situations.

just my take on your query.

regards

albert

Are we talking K10 here ?? cos my custom menu has your 6 as 7, and I can't find your 7 at all !?
.

Stu - K10D | DFA 100/2.8 Macro | DA 55-300 | AF-360FGZ |

So much to learn... So little time !

bforbes

Link Posted 05/03/2010 - 11:03
I think originally we were talking K20
Barrie
Too Old To Die Young

http://www.pentaxphotogallery.com/artists/barrieforbes
https://www.flickr.com/photos/189482630@N03/

stu49

Link Posted 05/03/2010 - 11:21
OK !!

Stu - K10D | DFA 100/2.8 Macro | DA 55-300 | AF-360FGZ |

So much to learn... So little time !

andyvarney

Link Posted 05/03/2010 - 11:56
Yes It is a K20, I'll have a look when I get home and see if I can figure it out.

Many thanks for pointing me in the right direction.

Andy
It's not the size of the dog in the fight, but the size of the fight in the dog!

Daniel Bridge

Link Posted 05/03/2010 - 13:25
iceblinker wrote:
Link AE to AF Point relates only to multi-segment metering. I can't remember exactly what it does, except that it doesn't do what you might think it does!

Think you're probably thinking of this thread.

Dan
K-3, a macro lens and a DA*300mm...

johnriley

Link Posted 05/03/2010 - 14:07
I expect it to lock the AE reading to a set value at the same time that it locks the focus.
Best regards, John

iceblinker

Link Posted 05/03/2010 - 15:34
johnriley wrote:
I expect it to lock the AE reading to a set value at the same time that it locks the focus.

That's what happens with "AE-L with AF Locked" but not "Link AE to AF Point".
~Pete

Anvh

Link Posted 05/03/2010 - 15:52
Matt has the answer.
https://www.pentaxuser.com/forum/topic/link-af-point-and-ae---doh---9785
Stefan


K10D, K5
DA* 16-50, DA* 50-135, D-FA 100 Macro, DA 40 Ltd, DA 18-55
AF-540FGZ
Last Edited by Anvh on 05/03/2010 - 15:52
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