Comments made by johnriley - Page 1099

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Don't use surgical spirit on Pentax cameras, it will probably damage the plastics used. Alcohol based products denature plastics.

Just wipe with a damp cloth and allow to dry. If complete immersion has taken place that's a different topic to this thread and more drastic action is needed.

Comment by johnriley posted on Water, dust, general grubbiness. What can you get away with these days with lenses? at 26/08/2011 - 10:41

If it's a Pentax lens, the camera will remember that lens (and up to 19 more) and apply the correction whenever it is fitted, assuming you made an individual correction and not a global one.

Comment by johnriley posted on Front focusing on K20D at 26/08/2011 - 10:38

thoughton wrote:

fatspider wrote:

johnriley wrote:
I think it was in Manchester that someone did an experiment, stopping people and asking could they remember their bank card PIN? "I think so, it's 1234" or whatever number was quite a common response.

Interesting.

And meanwhile an accomplice is stealing their wallet/purse

There was a study a couple of years back where a researcher stopped people in the street and offered them a free chocolate bar if they would reveal their computer password. The resulting headline read "86% of people will reveal their password for free chocolate". The very next day the Register ran the headline "86% of people will lie about their password for a free bar of chocolate".

* Percentage and the reward item are guesses due to my lousy memory

Yes, quite. We'll never know of course, but it is true that some people can be amazingly lax about security issues. How many tell the world on Facebook they are going away on holiday? We saw today what happened when an MPs daughter tried to arrange a "small soiree" for a few friends and hundreds of people turned up.

Still, our PU numbers may not be in quite the same league.

Comment by johnriley posted on I am not a number at 26/08/2011 - 10:36

Well someone had to go the "I am not a number, I am a free man!" route, and we were not disappointed!

Comment by johnriley posted on I am not a number at 26/08/2011 - 08:58

I think it was in Manchester that someone did an experiment, stopping people and asking could they remember their bank card PIN? "I think so, it's 1234" or whatever number was quite a common response.

Interesting.

Comment by johnriley posted on I am not a number at 26/08/2011 - 08:49

Don't worry, it gets worse....so you might as well give in and enjoy it.

Comment by johnriley posted on new lens?? at 25/08/2011 - 23:29

The 50mm f1.4 only focuses down to about 45cm, so isn't really a close up lens. The SMC Pentax D-FA 100mm f2.8 Macro lens focuses down to 1:1, so an object is reproduced life size.

There is a WR version of the 100mm as well, but that will be much more expensive.

Comment by johnriley posted on new lens?? at 25/08/2011 - 23:22

This probably cries out for the Pentax 100mm f2.8 Macro lens. The focal length is excellent for flower close ups and the performance is outstanding.

Comment by johnriley posted on new lens?? at 25/08/2011 - 23:09

Are you sure you waited long enough for the post to appear? If so, there's no reason why it would disappear. You've just posted a message and all forum sections are the same, so there must be some simple external reason for it.

Comment by johnriley posted on Vanishing Posts at 25/08/2011 - 17:37

Any lens set at 18mm is an 18mm lens. However, it depends on how accurate the barrel markings are, so there could be minor variations. But in essence, they will be one and the same, with perhaps varying quality depending on the individual lens.

An exception would be the 10-17mm fisheye zoom, where 18mm would look very different.

Comment by johnriley posted on Lens overlap at 25/08/2011 - 12:44

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