ChrisA

Joined: 4th January 2007

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ChrisA
Quote:
justgetoutandride wrote:
Dirk, your use of english seems to have changed lately, are you writing in your native language (spanish??) and using a translator?

I ask because the english you use now isn't as good as when you first started writing to us.
Apart from a missing plural on 'school', I can't see anything other than pretty damn good English there.
I'd be interested to know if the use of the word 'edification' came from Dirk, or a translator.

It's an interesting one, since 'edification' comes from the verb 'to edify', which refers to teaching, or instruction. It does not, in English, have anything to do with 'edifices', which are buildings, clearly the context of Dirk's post.

But they both have the same Latin root, so it's an understandable confusion.

But yes, absolutely. He does a damn sight better here than I would, attempting to get by on a Spanish (?) language forum.

Comment by ChrisA posted on San Miguel de Tucumán city… at 11/11/2007 - 12:02

ChrisA
Quote:
To ChrisA. Hi. Unless your Operating Manual is different to mine S.R. Function is on page 68 not 48. Just so no one gets confused. Anyone know if there were/are different editions?
Well MX veteren has the K100D Super in his sig, so I downloaded its manual and had a look in there.

It's certainly page 48 in the version I downloaded.

Sure you're not looking in the K10D manual? (It's p68 in there )

Comment by ChrisA posted on whats the deal with the Shake reduction at 30/12/2007 - 14:09

ChrisA
Quote:
I see that in the manual it advises to turn anti shake off when using a tripod. Why is this, and can it cause damage if you leave it on. What about monopods?
It certainly won't do it any damage.

It's been alleged that leaving it switched on, on a tripod, fools it into shaking the sensor when the camera isn't being shaken, thus resulting in worse results than if it was switched off.

I've never seen any evidence for this myself, nor seen any presented. I must try a really long exposure sometime, on the tripod with SR on, and then again with SR off. It would have to be very long, in order for any shake introduced by the act of pressing the shutter release to die down and be insignificant compared with the rest of the exposure.

The camera switches the SR off automatically, in most of the circumstances you'd be using it on a tripod anyway (bottom of p4, so it's a little tricky to really test this.

So the "be sure to switch off SR on a tripod" advice, also on p48, is a complete mystery to me.

Comment by ChrisA posted on whats the deal with the Shake reduction at 29/12/2007 - 19:00

ChrisA
Quote:
heres a few samples, the first taken in indoors low light at 50mm, and second outdoor nighttime at 200mm. maybe .5s shutter time nothing too long
In fact, the exposure for the first one is 1/8s, not 1/2. And the focal length is 93mm, not 50mm, assuming the lens is reporting its data correctly.

Assuming you have SR switched on, I'd say it's doing a pretty good job.

For the second one the shutter speed for the second one is in fact 1.5 seconds. An exposure time that long is really asking too much of the mechanism, pretty much regardless of the focal length.

Maybe you should look at the actual photo details a little more carefully before rubbishing the feature.

Comment by ChrisA posted on whats the deal with the Shake reduction at 10/11/2007 - 14:17

ChrisA
Quote:
Fortunately, it's not expensive to experiment with 50mm primes, as long as you go manual.
Agreed. I have three . Though none faster than 1.7

Comment by ChrisA posted on how much better would a 50mm prime really be? at 13/11/2007 - 13:07

ChrisA
Quote:
If you need to look at the results of any, I can always upload the raw file to the site for you to download. At least then you won't be basing a judgement on an 800 pixel wide image.
Quote:
...and of course if the South and London User Group (SLUG) ever met up again, you'd be more than welcome to try out any lens I have.
Cheers guys. Much appreciated - I'll keep these offers in mind.

Wrong sub-forum, I guess, but I like the sound of a local User Group - I'd be up for it if it exists.

Comment by ChrisA posted on how much better would a 50mm prime really be? at 13/11/2007 - 09:21

ChrisA
Quote:
That's a tough one to answer, ChrisA. Maybe there is no easy answer.
I'm fast coming to the conclusion that you're right.

Quote:
However, probably you can be relatively sure now of the various qualities of many pentax, Tamron and Sigma lenses in particular that have been extensively discussed here.
Indeed, and I'm very grateful for both the informative posts from a good number here, and also for the way some of you guys put up with me banging on about things until I gain some level of understanding.

Quote:
I don't know if you are aware of www.photodo.com which is a sister site to this one and all about lenses. There are extensive tests there and also owner reviews as well.
Aha. I wasn't, but I am now. Maybe the next key in the puzzle. It's like Half Life, or Far Cry, but without all the shooting. Well, a different sort of shooting, anyway.

Quote:
See you there?
Thank you, yes.

Comment by ChrisA posted on how much better would a 50mm prime really be? at 11/11/2007 - 23:21

ChrisA
Quote:
That is why I tend to believe my own experience with lenses in a real world enviroment rather tham MTF graphs etc. I also try to base any advice on what I think will suit the person rather than suit the way I shoot.
Sure. When you have the right sort of experience, I don't doubt that it's reliable.

However, I know I don't. And I also infer from what some people write elsewhere, that they don't either.

So what's a relative newbie like me to do?

Experimenting for oneself gets expensive once you get past the consumer-zoom price point.

Comment by ChrisA posted on how much better would a 50mm prime really be? at 11/11/2007 - 22:24

ChrisA
Quote:
Take the same picture on a "kit" zoom then a good 50 prime (The Pentax ones are generally all good. Print both up to 10x8 and the difference will be very obvious.
I believe you.

It just bugs me more and more (almost to the point that I have to pour myself a second glass of wine) when I see anything (other than a 100% crop, obviously) posted on a web forum, with people claiming that it shows anything at all about the respective sharpness of the lenses in question.

People here aren't often guilty of it, but there's another forum, not a million miles away, where for the sake of my blood pressure I've just had to stop reading it because of all the

"here's a picture"
"ooh, nice crisp sharp shot"

... and similar rubbish you read, when actually they're noticing contrast, USM, or just the fact that four pixels collapses to one when you quarter the linear dimensions of the rendition.

Sorry. Rant over

Comment by ChrisA posted on how much better would a 50mm prime really be? at 11/11/2007 - 22:06

ChrisA
Quote:
A prime 50 will blow away the images of such a long range zoom.
Can you really tell this at web resolutions?

Comment by ChrisA posted on how much better would a 50mm prime really be? at 11/11/2007 - 21:22

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