Photography
- Thread starter gd
- Start date
Great sites #juan, thanks a lot. I've bookmarked all three.
Did you notice there's one of those reversing optical illusions in the photo of the plane in front of the moon? Because it's a photograph taken from the ground I presume the view is from below and ahead on the aircraft's starboard side as it approaches the airport, but it can also be visualized as a view from above and behind.
Did you notice there's one of those reversing optical illusions in the photo of the plane in front of the moon? Because it's a photograph taken from the ground I presume the view is from below and ahead on the aircraft's starboard side as it approaches the airport, but it can also be visualized as a view from above and behind.
This is a shot of jupiter taken through a 4" achromatic refractor.
Jupiter, 2005 April. Quickcam Pro4000, 100mm f/12.5 achromat, 2x barlow. Images were acquired with IRIS, aligned, stacked and processed with Registax.
Quickcam Pro4000, is a simple web cam.
Registax is a freeware tool that registers, stacks and processes image sequences.
About the telescope: I wanted to buy Eric a telescope for his birthday that was light, easily transportable, had respectable optics, and didn't cost an arm and a leg.
I did some hunting and found a 4" f12.5 doublet and cell (a doublet is a 2 element objective lens and a cell is the adjustable carrier for that lens.)at the Vancouver Telescope Center. They also had a rack and pinion focuser, and a finder scope. I got everything for under $250.00.
I just had to put it together in a piece of thin-wall aluminium tubing.(another $30) Eric already had a second hand, German equatorial mount and tripod that we adapted.. After twenty years, this telescope is still one of his favourites.
As you can see, it works pretty well
Yes, I did notice that optical illusion.
It's like watching a baby's mobile spinning slowly on a string. Sometimes it appears to be turning clockwise and occasionally it seems to change and turn the other way while you are watching.
Jupiter, 2005 April. Quickcam Pro4000, 100mm f/12.5 achromat, 2x barlow. Images were acquired with IRIS, aligned, stacked and processed with Registax.
Quickcam Pro4000, is a simple web cam.
Registax is a freeware tool that registers, stacks and processes image sequences.
About the telescope: I wanted to buy Eric a telescope for his birthday that was light, easily transportable, had respectable optics, and didn't cost an arm and a leg.
I did some hunting and found a 4" f12.5 doublet and cell (a doublet is a 2 element objective lens and a cell is the adjustable carrier for that lens.)at the Vancouver Telescope Center. They also had a rack and pinion focuser, and a finder scope. I got everything for under $250.00.
I just had to put it together in a piece of thin-wall aluminium tubing.(another $30) Eric already had a second hand, German equatorial mount and tripod that we adapted.. After twenty years, this telescope is still one of his favourites.
As you can see, it works pretty well
Yes, I did notice that optical illusion.
It's like watching a baby's mobile spinning slowly on a string. Sometimes it appears to be turning clockwise and occasionally it seems to change and turn the other way while you are watching.
interesting work, juan.
One of the concerns arising from the rapid switch to digital is long term archival of the images. Many fear that images taken today will be lost either due to the failure of storage media or format changes that leave old formats with no operational equipment capable of reading them.
I concur with juan and dex that digital zoom is not of much worth. The exception to that is if you are using the image in a reduced resolution scenario and want the expediency granted from not having to edit the picture (think snap and send for example).
One of the concerns arising from the rapid switch to digital is long term archival of the images. Many fear that images taken today will be lost either due to the failure of storage media or format changes that leave old formats with no operational equipment capable of reading them.
I concur with juan and dex that digital zoom is not of much worth. The exception to that is if you are using the image in a reduced resolution scenario and want the expediency granted from not having to edit the picture (think snap and send for example).
caracal
I've been wondering about the storage of digital material as well. Some people are now saying that movies burned onto DVDs could start to deteriorate in three or four years. This is a little depressing since I'm just putting together a system to convert my old VHS tapes to DVD. Some of the older tapes are thirty years old. I'll have to do some more research.....shit
I've been wondering about the storage of digital material as well. Some people are now saying that movies burned onto DVDs could start to deteriorate in three or four years. This is a little depressing since I'm just putting together a system to convert my old VHS tapes to DVD. Some of the older tapes are thirty years old. I'll have to do some more research.....shit