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#31
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Spontaneous Spoke Combustion
On 19/12/2015 01:10, Jeff Liebermann wrote:
The USB camera really is a piece of junk. The double ball mount is completely useless and not very steady. It's difficult to focus without moving the camera. Lighting is good, but mine seems to have gone intermittent. The supplied (probably stolen) Amscope software is buggy and difficult to use. It offers an update, but since my camera seems to lack a model number, I have no idea which one of 4 mutations is needed. Installing it from the supplied disk destoryed all the other TWAIN drivers. I have one of these from veho. I was tremendously impressed with it. My eyesight is not what it once was and I can get very useful information from it. Sure what you say is also true, indeed my first one broke after 3 or 4 years, but considering its price and size I highly recommend it. |
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#32
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Spontaneous Spoke Combustion
On 19/12/2015 01:10, Jeff Liebermann wrote:
On Sat, 19 Dec 2015 00:05:03 +0000, Clive George wrote: On 18/12/2015 23:47, Jeff Liebermann wrote: Hint: You really should use a USB microscope camera for such photos. http://www.ebay.com/itm/381493384077 Cheap junk, but they work well enough for extreme closeup photos. Ooh, cheap and nasty, but interesting. Got any sample pics? Sure, but I have so many photos on my web pile that I don't recall which camera I used to take which photos. Here's some samples that I just threw together without cleanup, editing, or careful focus/lighting. I didn't have any spokes laying around the office: http://802.11junk.com/jeffl/pics/USB%20Camera/640x480/ The photo of my pocket steel ruler (scale) is in mm. Hamilton's left eye is from a US 10 dollar bill. There are better USB cameras available on eBay. The 640x480 resolution is only about 0.3 megapixels. Ok, thanks - it's a bit crap isn't it :-) http://www.evil-c.co.uk/DSCF9723.JPG Taken with my normal camera, 1/4 second exposure, hand held, no real effort to light or hold steady (indoors, not terribly bright light). It does focus down to 1cm in super-macro mode though. If you want to take decent microscope photos, something like this might be better. http://802.11junk.com/jeffl/pics/drivel/slides/Olympus-BHC-Microscope.html That's sort of the opposite end of the scale though isn't it :-) Thanks for the info, maybe I won't get one. |
#33
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Spontaneous Spoke Combustion
On Sat, 19 Dec 2015 01:43:41 +0000, Clive George
wrote: Ok, thanks - it's a bit crap isn't it :-) Yep. But at the price, it's a good deal. I use it mostly for seeing tiny SMT components on PCB (printed circuit boards) due to failing eyesight. I had the idea it could be used strapped to my wrist to aid in soldering, but the rather small depth of field ruined that idea. http://www.evil-c.co.uk/DSCF9723.JPG Taken with my normal camera, 1/4 second exposure, hand held, no real effort to light or hold steady (indoors, not terribly bright light). It does focus down to 1cm in super-macro mode though. Nice photo and impressive camera. Digging through the EXIF data: Fuji X10 camera http://www.kenrockwell.com/fuji/x10.htm 4000x3000 (12MP) 24 bits per pixel f2 lens, 7.1mm focal length About $400 retail Very nice. If you want to take decent microscope photos, something like this might be better. http://802.11junk.com/jeffl/pics/drivel/slides/Olympus-BHC-Microscope.html That's sort of the opposite end of the scale though isn't it :-) I have 3 assorted binocular microscopes. I was very lucky to get them at good prices. Yes, they're rather expensive and probably overkill for looking at rusted and broken spokes. However, they're about the only thing that will work for really small stuff. For example, if I wanted to look at the grain structure of the steel where the spoke broke off, nothing less than a good microscope will suffice. Fortunately, a bicycle mounted microscope is one item that cannot be purchased at your local bicycle shop. Thanks for the info, maybe I won't get one. Y'er welcome. You're doing fine with your Fuji X10. However, if you were stuck with a lesser camera (such as my Canon S5IS or various cell phone cameras), you might be shopping for a better closeup camera. For example, a 60x adapter for an iPhone 4/4s for $5.00 http://www.ebay.com/itm/331088397523 Incidentally, you can easily convert a computah webcam into a USB microscope. Usually, all that's needed is a lens barrel extension and LED light ring. Lots of instructions: https://www.google.com/#q=convert+webcam+to+microscope -- Jeff Liebermann 150 Felker St #D http://www.LearnByDestroying.com Santa Cruz CA 95060 http://802.11junk.com Skype: JeffLiebermann AE6KS 831-336-2558 |
#34
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Spontaneous Spoke Combustion
On 18/12/15 02:50, KyleBH wrote:
OK, a few more data points and pictures. These appear to be DT spokes. I also have a rear wheel as part of the set, same thing happened. See pictures he https://www.dropbox.com/sh/z8ngulzrn...zfz2_TRQa?dl=0 I took a number of shots of spokes about to break, as well as one pair where I show a before and after cleaning off the corrosion. Tried to get the ends too. Very nice pictures. Very weird fault it really looks like corrosion then a stress fracture, but I'm no mechy. |
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