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Comment by John Newton posted on Sensor Cleaning at 28/10/2005 - 10:16
Comment by John Newton posted on Canon EOS 5D at 27/10/2005 - 23:03
As a working photographer, it gives me a kick to see the Nikon/Canon crew boasting about how superior their gear is, when the *st D puts most of them to shame.
Fact is, if you get a 10D or 20D in your hands you'll soon find it puts the istD to shame.
Pentax glass is the best thing, no mistake. Pentax film cameras are superb. But now that Pentax has to deal with 'electronically' processing the image rather than leaving it to the film manufacturer, they have lost any advantage they had.
It's a great camera of amateur use, but make no mistake Canon out classes it when it comes to pro use event photography.
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Comment by John Newton posted on Canon EOS 5D at 22/10/2005 - 19:16
I use halogen studio lighting with my istD - and the best results are obtained, as already suggested, by manually setting the white balance.
A nifty aid to doing this is Lastolite's ezbalance card - its really an elasticated reflector type thing that folds up into a 4" circle - very handy for keeping in the camera bag and with a white on one side and 18% grey on the other you can get WB setting as well as exposure!
The other thing I do is shoot RAW, so that the WB can be adjusted (rescued?) later, in the 'computer dark-room' (!)
Comment by John Newton posted on Colour problems under studio lights with ist D at 22/08/2005 - 22:45
Doh! I should have realised.... I do use Adobe CS and have the Pentax RAW converter installed - just didn't connect the three letters together.
I became a RAW convert about 6 months ago - even bought some big gig CF cards to prove there was no going back! After cutting my teeth on a K1000 and a darkroom in the spare bedroom years ago, RAW is now where it's at for me!
Thanks again...
Comment by John Newton posted on Up-sampling Digital Images at 23/08/2005 - 18:23
I've been playing with different photoshop (CS) options quite a bit since reading the postings! I did also try the 10% at a time method, but saw some weird effects, a bit like 'tiling' when zooming right in to see the individual pixels (why would I do such a thing? must be developing an obsession - yikes!)
Arthur, I've never heard of ACR. If you could give me a clue where to look on the web it would be appreciated (most search results took me to radiology related sites, hmmmm...)
Thanks again!
Comment by John Newton posted on Up-sampling Digital Images at 22/08/2005 - 22:31
As a istD user I've recently been looking into getting some of my better images printed for framing - ideally 16" x 12" or thereabouts. The trouble is when you consider the pixel resoution of the image and factor in the desired 300dpi printing resolution, it means that 3008 x 2008 out of the camera image will give approx 10" x 6.7" of print.
So I guess some serious up sampling is required!
I've dabbled with resizing (resampling) the image in Photoshop, but was wondering if there is a better way?
Does anyone out there have any pointers on the best way to tackle getting larger prints and minimising the resulting degradation in quality?
Thanks in advance!
John
Comment by John Newton posted on Up-sampling Digital Images at 16/08/2005 - 22:41


Just a word of advice about using compressed air - if you are tempted. The thing you are cleaning is actually a chromatic filter mounted above the sensor, so high pressure air could possibly force a dust particle between the sensr and the filter - then it's there forever!!