I tried messing about with the channel mixers on a couple of images in rawtherapee. They were all taken on K10D with Pentax-M 28/3.5 at around f11 I think.










Does anybody know of a good tutorial of how to use the channel mixer to modify/enchance B&W and colour images?

Thanks,

Richard

I have the Jessops 360AFD, I have been convinced that is it full p-ttl, if you put the camera on a 2 second delay it flashes at the start and also with the shutter.

It generally works well for giving a bit of extra light indoors, I usually bounce it off a wall or ceiling and it works well for that. I would say it feels quite cheaply made but what do you expect for someting about half the price of alternatives. Best thing to do is get to Jessops and ask to try it out, they were quite happy to do this for me. I paid a bit less for it, £37 I think, so if you're patient they may put them on offer again sometime.

I have a slightly older version of the current 70-300 Sigma APO which I got when the Pentax was new out and priced a bit higher. I had tried out the tamron and although sharp the PF was too annoying for me. I haven't tried the Pentax but from what I've seen it seems to be very impressive, especially for £189 with £25 cashback. I have been very happy with the Sigma though, very minimal PF and sharp enough for me a couple of stops down even at 300mm.

A couple of months ago places were selling the Sigma APO for £110 and I would say that is a good deal but now it is back up to £150 it may be worth the bit extra for the Pentax, beware the cashback ends soon though!

Here goes, thought I'd kick things off with a picture trying to tell the story of what happens in my brain when I'm looking at music with too many notes on it.




info:

K10D with Pentax-F 50/1.7
1sec, F8, ISO 100
16/01/2009 at 17:19
Tripod

No1 is very good, I like the colour and people in it, the horizon is easily fixed.

I have persuaded myself it is worth a £15 gamble. Might have been better to buy 15 lotery tickets but I think it is worth a go.

Here's one of some guy outside the Notre Dame Cathedral in Paris, I know his hair is blown but I still quite like it.

Good ebay bargain there, I just got on of those 50mm lenses from someone on this forum and think it is worth every penny of the £65 I paid for it.

Can anyone recommend some free software that can be used to de-fish pictures taken with a fisheye lens?

I have a Pentax-F 17-28mm so on K10D the fisheye effect is reduced but still noticeable. From what I can tell, at 17mm it seems to equate to about 14-15mm rectilinear which would be a nice rectilinear wideangle option to have without needing to buy a new lens.

I am planning to use it with a 35mm film SLR also at some point and would like to have the option of de-fishing scans from that when I get round to it.

50mm arrived yesterday and so far I'm very happy with it.