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Photo Forum / General Photo Topics / General Topics / February 2007Pentax K100D Infrared Test
Hi All, I've just uploaded a brief test of how the Pentax K100D handles infrared photography with a Hoya R72 filter: http://www.dimagemaker.com/article.php?articleID=880 Cheers, Wayne  SignatureWayne J. Cosshall Publisher, The Digital ImageMaker, http://www.dimagemaker.com/ Blog http://www.digitalimagemakerworld.com/ > Hi All, > [quoted text clipped - 5 lines] > > Wayne The local camera store wanted 80$ Canadian for a 49mm infrared filter. Is that out of line? mike >> Hi All, >> [quoted text clipped - 10 lines] > > mike Unfortunately, no. -- www.mattclara.com >> Hi All, >> [quoted text clipped - 8 lines] > The local camera store wanted 80$ Canadian for a 49mm infrared filter. > Is that out of line? Under $20 including postage from Ebay http://cgi.ebay.com/49mm-IR-Infrared-FILTER-for-Sony-Samsung-Panasonic-NEW_W0QQi temZ290033055233QQihZ019QQcategoryZ48525QQrdZ1QQssPageNameZWD1VQQcmdZViewItem On 18/02/2007 15:14, Fat Sam dixit: > Under $20 including postage from Ebay Those filters seem to be a Big Deal, but I'm used to be a bit distrustful against "big deals", specially on eBay. Has someone here tested them? TIA Cyrus (the /paranoid/ virus) SignatureI love to be mailed just by smart people: perl -we 'print "\12\142\145\162\156\141\155\141\100\151". "\164\167\145\142\56\151\164\12\12";' Spammers scratch here with a diamond to find my address: > On 18/02/2007 15:14, Fat Sam dixit: > [quoted text clipped - 6 lines] > > Cyrus (the /paranoid/ virus) I've had nothing but good experiences buying filters and lenses on Ebay. To date I've bought :- Circular Polariser filter UV filter ND2 filter ND4 filter ND8 filter 2.5x Telephoto lens 0.45x Wide Angle lens Macro filter Sepia filter Diffuser filter Closeup filter FD filter All at amazingly low prices - normally around a third the price they retail for in shops. And all extremely good quality. I've also bought tripods, light tents, rain covers, and camera bags. The only time I've ever had a bad experience buying from Ebay was when I bought frm sellers in China and Hong Kong. > I've had nothing but good experiences buying filters and lenses on Ebay. > [...] > All at amazingly low prices - normally around a third the price they retail > for in shops. And all extremely good quality. Two google searches: 1. "mean free path". Imagine a mine field, square, 100 metres on a side. In it are 100 mines placed at random, with triggers 1cm x 1cm in size. With high probability, you can walk across this minefield without incident. Question: would you do it to save $10? $100? 2. "false economy". There is more to life and such than saving a few bucks. Basically, eBay is the biggest false economy on the net, and it's growing. Of course, when you step on a mine at eBay you aren't killed or left without a leg, but it's quite possible that even one incident is enough to offset an entire lifetime of transactions. Certainly the outrage and injustice sensed will be far out of proportion to the $10 just lost. If B&H, Vistek or whoever ever manages to take my money and run (and extremely low probability event -- a number as close to zero as you can imagine), at least I know where to send the Deadly Viper Assassination Squad. What do I tell the DiVAS if the miscreant is "SquareDeal429"? >> I've had nothing but good experiences buying filters and lenses on >> Ebay. [...] [quoted text clipped - 19 lines] > where to send the Deadly Viper Assassination Squad. What do I tell > the DiVAS if the miscreant is "SquareDeal429"? I suspect you have been stung on Ebay. A few simple precautions will minimise the chances of this. They won't eliominate risk completely, but that's the nature of life. It involves some risks. However, some calculated risks are worth it if the payoff is big enough. Always check a sellers feedback. If they have a history of negs, then investigate and see why. If it smells dodgy, them move on to the next seller who has good feedback. Avoid China and Hong Kong. Spend a lot of time searching and don't settle for the first item that appears to match your criteria. Calculate what you are prepared to pay, subtract the postage cost from that and you have a maximum bid figure. Don't bid any higher than that. As I said, you cannot eliminate all risk, but you can take intelligent measures to minimise it. Buying from Ebay doesn't have to be the completely random minefield that you portray it to be. With a little caution, you can quite easily find the safe pathway through it. The upshot is that you can end up getting some cracking bargains. Especially if you're a photographer on a limited budget like I am. >>> I've had nothing but good experiences buying filters and lenses on >>> Ebay. [...] [quoted text clipped - 40 lines] > The upshot is that you can end up getting some cracking bargains. > Especially if you're a photographer on a limited budget like I am. There's no way these knock-offs are going to perform as well as, say, B+H. -- www.mattclara.com >>>> I've had nothing but good experiences buying filters and lenses on >>>> Ebay. [...] [quoted text clipped - 43 lines] > There's no way these knock-offs are going to perform as well as, say, > B+H. The point being....Not everyone can afford top-of-the-line kit. Some people work to limited budgets. So you make the most of what you can afford. And although the performance may not be as high, you learn to work within those tolerances. Not all of the worlds greatest photos are taken on an EOS 1Ds. Some get taken on a Finepix S5600. > > eawckye...@yahoo.com wrote: > [quoted text clipped - 46 lines] > > --www.mattclara.com You mean B+W, right? -Karl >> "Fat Sam" <samandjanetk...@tessco.net> wrote in message I noticed, as usual on Usenet, my original question drifted away a bit... Before this thread reaches epic dimensions, involving global economy et al., all I need to know is: "Please, is there a kind user who bought those cheap IR filters on eBay? And in this case, can I know if they are just some black glass or something which can replace a very expensive professional IR filter for a non-professional week-end photographer on a short budget?" Thanks in advance! Cyrus (the /adrift/ virus) [..] > I noticed, as usual on Usenet, my original question drifted away a bit... > Before this thread reaches epic dimensions, involving global economy et [quoted text clipped - 5 lines] > > Thanks in advance! Some folks report luck (as in, interesting results, if not strictly IR photography) with two polarizing filters adjusted to be opaque in combination. I haven't tried it yet, but maybe today's the day. :-) > Some folks report luck (as in, interesting results, if not strictly IR > photography) with two polarizing filters adjusted to be opaque in > combination. This is a good method to make *very* long exposures, in the order of 15 minutes or more. It is very good if you want to make urban photos without people and cars. But I guess digital sensors would raise too much noise, in such a time. Cyrus > "Please, is there a kind user who bought those cheap IR filters on eBay? > And in this case, can I know if they are just some black glass or > something which can replace a very expensive professional IR filter for > a non-professional week-end photographer on a short budget?" i bought two of his filters last year. apparently his prices have gone up dramatically since then - the 72mm filter i bought was $16, and now it is $36! it shipped promptly and arrived in the usual plastic filter case, with the cutoff frequency marked in red on the liner paper. there are *no* markings of any kind on the rim of the filter. it does what it claims to do - block all visible light and pass infrared. if i look at a lightbulb, i can see a very faint outline of the filament. pictures taken with it have the infrared look. it works. i'm fairly certain they are nowhere near as good as a hoya or b+w, but for what i paid for it, who cares. a 72mm hoya r72 is $263 at b&h, which is a *lot* more than i care to spend just to experiment with infrared. however, b&h has 49mm-55mm hoya r72 filters for just $40 which isn't that much more than these noname ones. another option is get infrared polyester film and some kind of holder: http://www.bhphotovideo.com/bnh/controller/home;?O=Search&A=details&Q=&s ku=102762&is=REG > another option is get infrared polyester film and some kind of holder: The really cheesy way is to use a piece of unexposed, developed E6 film. That's better for lighting than shooting thru, but images shot thru it might be usable for some testing purposes. I have some film like this left over from another project and don't mind sending a small piece to the OP if that's of any use. It's 120 size so won't cover a big lens though. >> another option is get infrared polyester film and some kind of holder: > The really cheesy way is to use a piece of unexposed, developed E6 > film. That's better for lighting than shooting thru, but images shot > thru it might be usable for some testing purposes. I have some film > like this left over from another project and don't mind sending a > small piece to the OP if that's of any use. It's 120 size so won't > cover a big lens though. Yes, an astronomer here in Italy told me this. I'm waiting to see his photos. Cyrus > > another option is get infrared polyester film and some kind of > > holder: [quoted text clipped - 5 lines] > sending a small piece to the OP if that's of any use. It's 120 size > so won't cover a big lens though. I've never shot through 'black' E6 film like that, but I do use it over the front of a very small hot-shoe flash in my studio: it triggers the IR slaves on my studio flash units very reliably. Peter > i bought two of his filters last year. apparently his prices have gone > up dramatically since then - the 72mm filter i bought was $16, and now > it is $36! I must buy them before they reach the Hoya price ;-) > i'm fairly certain they are nowhere near as good as a hoya or b+w, but > for what i paid for it, who cares. a 72mm hoya r72 is $263 at b&h, > which is a *lot* more than i care to spend just to experiment with > infrared. however, b&h has 49mm-55mm hoya r72 filters for just $40 > which isn't that much more than these noname ones. Good suggestion, thanks. > another option is get infrared polyester film and some kind of holder: > http://www.bhphotovideo.com/bnh/controller/home;?O=Search&A=details&Q=&s > ku=102762&is=REG Wow, these are even better! <diy mode on> I can somehow mount them on a Cokin support. <diy mode off> Thanks a lot! Cyrus [SNIP] > another option is get infrared polyester film and some kind of > holder: Ilford makes a polyester filter in Cokin P size for use with their SFX film. Technically that's an extended red film rather than a far infra-red one, but the filter works moderately well with true IR films as well - and it's reasonably cheap. SFX is being made again, after being discontinued for a while :-) Peter On Feb 19, 9:20 am, "eawckye...@yahoo.com" <eawckye...@yahoo.com> wrote: > > I've had nothing but good experiences buying filters and lenses on Ebay. > > [...] [quoted text clipped - 19 lines] > where to send the Deadly Viper Assassination Squad. What do I tell > the DiVAS if the miscreant is "SquareDeal429"? If filter usability were based solely on one retailer cost, I know of professional filters for scientific use that cost about $800 ea. in the same size. No mounting. Likely you won't get the same optical quality in a cheap filter, but it's infrared so who cares? As long as it attenuates the same wavelengths, it should be fine. |
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