All Forum Comments
Comment by petrochemist posted on Two IR shots - two treatments at 29/07/2011 - 20:32
I'm disappointed to find that in lens stabilization doesn't work, but as a Pentax owner I always knew body stabilization is better!
(But having beer in my Caniam might spoil that...)
I guess even without IS it works out as £3.50 well spent.
Comment by petrochemist posted on Finally a decent use for CaNikon lenses at 28/07/2011 - 22:21
Just how close did you get?
Comment by petrochemist posted on Damsel .. in no distress at 24/07/2011 - 09:54
how do you rate this lens good or bad advice please
Mine's not bad but is lacking the filter.
Comment by petrochemist posted on cosina 100 macro AF at 23/07/2011 - 00:57
We get to renew every 10 years, too - and the complete roadblock for alcohol testing? I've run into those at least 4-5 times now.
Bret
Comment by petrochemist posted on Another pointless thread at 22/07/2011 - 14:19
#8 has a percentage pass of 0.061% to 0.61% in the visible spectrum
it has a percentage pass of 0.0003% @313nm and 0.025% @365nm in the UV
it has a perentage pass of 0.43% between 780-1400nm in the infra red
If we ignore all but the visible light (can we?) then a #8 equates to between 9-1/2 and 12-1/2 stops
Comment by petrochemist posted on Welding Mask Glass at 22/07/2011 - 14:04
Just grind the edges smooth with silicone carbide paper or a stone?
Comment by petrochemist posted on Welding Mask Glass at 22/07/2011 - 13:53
Is there any chance of members posting more of the trial photos this is an interesting apprroach and as said worth the few pounds just to give things a whirl.
Regards Ian


According to my records these were with a shade 8 (My weakest). The filter was just slipped into a Cokin mount without any further light proofing. I must get round to trying them out again!!!
Comment by petrochemist posted on Welding Mask Glass at 21/07/2011 - 23:07
Is ND16 the same as 16 stop (I doubt it - so what is it equivalent to?)
Do DLSR's suffer the equivalent of Reciprocity failure? or was this a red herring designed to keep me out of the clique?
DSLRs show increased problems from hot pixels in long exposures, but do not show reciprocity failure, which causes problems in long film exposures.
Comment by petrochemist posted on Welding Mask Glass at 20/07/2011 - 21:29
I find 'Wow' type comments do help encourage me, and generally feel that the better shots get slightly longer comments, reducing the dilution factor of 'over-use'. I have noticed recently an increase in comments consisting of only smileys, which seem to be a quick way of saying things like 'I like this' - though they don't work so well in the 'My photos' forum (They get confusing in Recent Activity, my preferred way of browsing new posts)
Personally I also find the number of Views a useful gauge of the standard of my photos.
I've rarely posted photos in the forums, as the Gallery is much easier to use. This certainly doesn't mean I'm not after critique - perhaps just that I'm lazy.
Comment by petrochemist posted on Photo Critique at 20/07/2011 - 21:22


The effect you've ended up with in no 1 makes me think HDR.
Neither shot particularly looks like IR, mainly because they contain little that shows classic IR effects.
IR causes green plants show very pale, but ripe corn has not shown this so much, the high cloud contrast is a IR effect but is often seen via polarisers or red filters (in B&W shots)
Perhaps the ultra sharp images also detract from the IR feel I'm used to, my IR shots are usually somewhat soft.