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Logitech C910 Planetary
Posted 22 June 2011 - 11:17 AM
Has anyone out there used a Logitech C910 for astro imaging? According to the blurb it has a 5MP sensor and outputs 1920 x 1080 video.
The sensor seems to be capable of more, 2592 x 1944 by my reckoning, but it might only be available for still pictures.
The C910 might not be any good for DSO, but it might be great for planetary as the pixel size is either 2um or 1.5um, depending on which resolution you can actually get.
To put that into context the SPC880/900 has a pixel size of 5.6um so for any given set up (telescope + barlow) its going to give you between 3 and 4 times as many pixels!
Posted 22 June 2011 - 11:45 AM
Posted 22 June 2011 - 11:57 AM
Thanks for the quick reply. I checked on the Logitech forum, someone else was asking the sensor type or resolution and Logitech wouldn't confirm the sensor part number but did say it was a 5MP sensor. He did say that 10MP pictures are interpolated.
You could be right about the Lifecam, the Cinema HD uses an OV9712 which is 1280 x 800 pixels, I haven't been able to find out which sensor the Studio uses.
Posted 22 June 2011 - 12:31 PM
Posted 22 June 2011 - 01:32 PM
Microsoft say it is 1920 x 1024 video (2304 x 1728 still) which is 2MP video. The still image might be interpolated (it's nearly 4MP). They also say that the chip size is nearly double the Cinema, which is a 1/4" chip, so I would assume that it's either a 1/2", 1/2.5" or 1/3".
Now a pure guess, I suspect that MS will might have stayed with Omnivision so a quick look at the native HD sensors capable of 30 fps at 1080p gives OV2710 or OV2715. I discount the OV2720 since it is a 1/5.8" chip which is smaller than the Cinema chip size.
The OV2710 and OV2715 are both 3 micron sensors in 1/3 and 1/2.7" respectively, does that look about right for your Studio?
If they did use either of these sensors then the still image resolution is interpolated.
The chip might be bigger than 2MP of course, it could be a OV56 series (5MP) and I have seen reports that it uses a 8MP, which would make it a OV88 series, but these use 1.4 micron pixels.
Not sure if you can tell from your model? If you could see how many legs the chip has that might help?
Posted 22 June 2011 - 07:38 PM
Thanks for the link to Cloudynights, I checked that out and I must say I am surprised that the C910 wasn't better than the Lifecam, it's high resolution for a start. The Lifecam they used was a 5000, almost the same as a Cinema and offers 720p recording. The Studio you have and the C910 are capable of 1080p recording, the difference is 1280x720 and 1920x1080 so the pictures from the C910 should have had more detail.
There possibly won't be much difference between the Studio and the C910 at the output.
Except, if the Studio has a 2MP sensor (1920 x 1080 = 2MP) Logitech have confirmed that the C910 has a 5MP, so perhaps they use a 'bin' method?
Posted 22 June 2011 - 08:04 PM
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