Oggy

Joined: 26th December 2008

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Oggy
I should know the answer to this but I cannot for the life of me think of it.

Considering a lens like the DA" 60-250, what happens to the air inside it as you change focal length? It has to go somewhere or as you released the zoom ring, it would return to the focal length it was set to when you fitted it, but it would be difficult to vent it while retaining the weather resistance.

Confused,

Worthing.

Comment by Oggy posted on Zoom question. at 23/04/2011 - 23:43

Oggy
That is one of the most impressive pictures I have seen on this forum.

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Comment by Oggy posted on One lump or two? at 23/04/2011 - 20:59

Oggy
Many happy returns Don - and fair play to Mrs Tiger.

Comment by Oggy posted on The pentax 60 at 23/04/2011 - 20:52

Oggy
johnriley wrote:
I've also seen people changing cards whilst the camera is still switched on, swapping them between marques without formatting, changing lenses with the camera on and lots of other things.

It's poor technique at best and can be disastrous at worst. This is not Pentax-specific, but applies to all makes of camera.
While I agree that it is best avoided, some card sockets are designed so you can hot swap. The contacts are different lengths so that as you push the card in, the earths and returns make contact first, then the power connections then the data lines.

I also believe that the card door also acts as a power off switch. Hard or soft off I do not know.

It would be interesting to see if, next time someone has one of these lockups, opening the card door clears it.

Comment by Oggy posted on K10D locked up at 23/04/2011 - 18:35

Oggy
I think you are slightly braver than I Don. I thought about trying it then thought about the cost of a new card and didn't get round to it.

I would have thought this was one of the main reasons for having a "soft off".

Comment by Oggy posted on K10D locked up at 22/04/2011 - 23:53

Oggy
Any word from the management on this?

Comment by Oggy posted on Pentax User Plus member at 22/04/2011 - 21:51

Oggy
I would have thought (hoped) that either would have checked that there was nothing important going on before it was enacted.

Comment by Oggy posted on K10D locked up at 22/04/2011 - 21:50

Oggy
To my way of thinking, the first one is a little over exposed. I would not have used +.3EV and stopped the lens down a little. 150-500s are not happy wide open at the long end. It does not look as if the light was your friend.

Second shot looks very good.

Comment by Oggy posted on A couple from this morning at 22/04/2011 - 21:45

Oggy
Remember the "off switch" is not an off switch. It does not interrupt power from the battery, it simply tells the camera to ignore you until you turn it on again. This is why you have to take the batteries out.

It should also stop what Don did being a problem.

Comment by Oggy posted on K10D locked up at 22/04/2011 - 21:34

Oggy
Quote:
In rare cases the camera may not operate correctly due to static
electricity. This can be remedied by taking the battery out and
putting it back again
Quote from the manual.



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Quote from Oggy (30+ years in electronics.)

I am surprised they didn't blame SDM.

Comment by Oggy posted on K5 Shutter Jamming at 22/04/2011 - 12:29

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