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AndyEllis

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About AndyEllis

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  1. I think that put simply, my point is that looking at any single factor is fraught with pitfalls - this applies equally to noise. A switched off sensor generates no noise at all but is clearly no good for imaging. A better, but still by no means perfect measure is signal to noise ratio (SNR). Perhaps it's best to say that a lot of features that Canon has built in to it's sensors in recent years have improved the signal and reduced the noise though not at every iteration - some provide a big increase in signal but have a marked increase in noise but still represent an increase in SNR, so the
  2. I meant 'cite' not 'site' - by that point in trying to explain it, my brain was going in to 'forced override standby mode'.....
  3. I was thinking it wasn't so I decided to add a bit more science... Well Capacity is related to dynamic range in that a greater well capacity leads to a greater dynamic range which is a measure of how well a sensor responds to both high and low levels of light, i.e., a greater dynamic range gives a more detailed signal across all values of incident photon density. On the surface, this may seem to be a good thing, but there are other considerations to take in to account here. Another factor that should be considered is Conversion Gain which is a measure of voltage change per single charge. Conve
  4. The 1100D has a better sensor than the 1000D - it has micro-lensing which was introduced with the 1100D and 550D. The well depth, like noise, is a bit mis-leading when considering what the camera is capable of - it is a measure of the full capacity of each individual pixel well and though it is proportional to dynamic range (a better dynamic range gives better performance across different lighting levels) more important factors are Quantum Efficiency (which relates to how many photons are converted to electron hole pairs) and physical factors such as pixel size, pixel material, micro-lensing
  5. I imagine it'll work well with a firefly on the moon. I used one with an 098BL chipped webcam (Vesta Pro) on Mars and got some reasonable results with my 7.1" Mak Newt.
  6. Just about any dSLR where you can set the ISO to 400 or 800 and take timed exposures over 10 secs will do it - you might be out of luck with video, though you could set the camera to take a series of 10 sec exposures at ISO 800 (as an example) then make an avi out of them.
  7. Both types of sensor in the 4k are CCD, just that the sony one is an order of magnitude more sensitive
  8. Gary's article is good, but you must bear in mind that it is a study of noise and not of sensitivity - to put that in context, let's say a 450D has a noise value of 1 and sensitivity of 10 - yes, a 500D may then have a noise value of 2, but it is also more sensitive say 13. On the same scale a 550D would be 3 and 15. If you consider the gap, a 450D is '9' a 500D '11' and a 550D '12'. These are just arbitrary values, but the point stands. The 550D has improved pixel fill and micro-lensing (a tiny lens over each pixel to focus incident light on the sensitive material). In essence it is true t
  9. There were two different sensors fitted to QC4Ks - this page shows my QC3K/ QC4K mod and at the bottom of the page, there is a pic showing the two different sensors - it must have the Sony ICX098BQ fitted for the mod to work. The CCTV camera may be a 1004x type, in which case John Groves' mod applies - http://jaggedplanet.com/ExViewMod.html
  10. Yes I saw that - the 350D's a great camera - I'm sure you'll get some great results with it
  11. Hap - that's not true - I've done over 200 1000D filter removals and have never had any cameras having a problem reaching infinity focus - including the one which I owned myself for two years and tried with dozens of lenses.
  12. I can see that this discussion is pretty much done with, but just out of interest, the 1100D vastly out-performs the 1000D and 350D. In the last few iterations of Canon's EOS cameras, they have introduced several improvements in the sensor including increased purity of pixel sensitive material, increased pixel fill and micro-lensing. All of this adds up to the fact that although the 1100D has smaller pixels than say the 350D and is noisier than the 450D, it is far more sensitive than either and capable of producing superior results. This image shows web-compression artefacts, but you can see
  13. Beautiful image - is the 39th of November a way of denying the existence of December? clever... I'll have to say to the kids, 'No I haven't got you anything, there's nothing special about the 55th of November...?'
  14. my obs pc runs xp - cracking for anything astro and very stable - way better than vista - I got an xp install disk for £17 btw....
  15. You can flash the cam to look like an SPC900NC using an SPC binary - the softs to do it are here - http://www.burri-web...98/soft/wcrmac/ This is the binary for an SPC900NC - change the file extension from .txt to .bin - it won't allow uploads of binary files. spc900nc.txt
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