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Post by Deleted on Jan 24, 2014 18:00:29 GMT
Hi pards, I have some other questions and tips request before i can start with av session. i setup almost everithings, camera, cables, learn menu set ecc. I ask if is better a tv or monitor or a laptop with framegrabber to observation? Usb framegrabber is downgrading the quality of image or is same as tv-monitor? I got a usb grabber named video2go, brandless and very inexpensive (15 euros).it's ok or better i trash it and use a monitor? i need some filter to see dso? Or is better with no filter? I have a OIII LUMICON, idas pv, ir cut and ir pass ( both baader), minus violet and some color filter (meade). grazie and whait your precious reply Giuseppe
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Post by Deleted on Jan 24, 2014 18:25:50 GMT
Hi Geppi if you dont want to record your view then a TV/monitor is generally better for live imaging.
If you use a grabber the image will be fine and you can record it on the laptop if you wish to process later and handy for portable use.
For DSOs it really depends on how much light pollution you have regarding filters. If you have a dark site you may not need one. Most use filters to combat light pollution.
The OIII will bring out more detail in nebula and darken the background same as a UHC filter, but it generally only works with nebula and not galaxies.
An IR cut will help stop the stars from "bloating" and is useful.
If you change filters you may have to adjust the focus a bit for each.
Best to experiment the next time your out to what works best.
Hopefully helpfull
Carl
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Post by Deleted on Jan 24, 2014 18:54:34 GMT
Hi Geppi if you dont want to record your view then a TV/monitor is generally better for live imaging. If you use a grabber the image will be fine and you can record it on the laptop if you wish to process later and handy for portable use. For DSOs it really depends on how much light pollution you have regarding filters. If you have a dark site you may not need one. Most use filters to combat light pollution. The OIII will bring out more detail in nebula and darken the background same as a UHC filter, but it generally only works with nebula and not galaxies. An IR cut will help stop the stars from "bloating" and is useful. If you change filters you may have to adjust the focus a bit for each. Best to experiment the next time your out to what works best. Hopefully helpfull Carl What is an IR cut Carl, I have bloated stars I'm sure? I often look at other images and wonder how I can get tighter stars!
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Post by Deleted on Jan 24, 2014 19:28:32 GMT
Hi Karl when we remove the IR filter from our cameras for astro it allows the infrared spectrum in which CCDs are sensitive to. The camera then has a hard time focusing IR light with normal light so the IR filter in a nutshell sorts it out. Resulting in tighter stars. If your on astro sites a lot of the filters now come with IR cut built in as such like sky glow types. The NB sly glow with IR cut is good but around £50. Best I can explain it
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Post by Deleted on Jan 24, 2014 19:50:22 GMT
Hi Karl when we remove the IR filter from our cameras for astro it allows the infrared spectrum in which CCDs are sensitive to. The camera then has a hard time focusing IR light with normal light so the IR filter in a nutshell sorts it out. Resulting in tighter stars. If your on astro sites a lot of the filters now come with IR cut built in as such like sky glow types. The NB sly glow with IR cut is good but around £50. Best I can explain it Hi Carl,
I got this one recently but have not had chance to try it properly yet:
www.firstlightoptics.com/light-pollution-reduction-imaging/baader-neodymium-filter.html
I thought however, this would just for nights when the Moon is playing havoc. I thought also that with a filter I made need longer integration times. Do you always use a filter then for VA?
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Post by Deleted on Jan 24, 2014 19:53:48 GMT
Hi Karl when we remove the IR filter from our cameras for astro it allows the infrared spectrum in which CCDs are sensitive to. The camera then has a hard time focusing IR light with normal light so the IR filter in a nutshell sorts it out. Resulting in tighter stars. If your on astro sites a lot of the filters now come with IR cut built in as such like sky glow types. The NB sly glow with IR cut is good but around £50. Best I can explain it Another question that has just popped into my simple brain, why do we remove the IR filter from the camera to then replace it with another IR filter?
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Post by Deleted on Jan 24, 2014 20:46:45 GMT
I think the answer is the stock filter blocks light in the Ha region which we want and the IR cut lets it through. With a refractor the glass dosnt focus IR light equally so is most effected. Also effects colour. With integration times yes a sky glow does make things darker so would be slightly longer. I haven't used an IR cut yet but then I'm one of the few reflector users and it may not need it as much. No my brain hurts
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Post by Deleted on Jan 24, 2014 21:46:07 GMT
I think the answer is the stock filter blocks light in the Ha region which we want and the IR cut lets it through. With a refractor the glass dosnt focus IR light equally so is most effected. Also effects colour. With integration times yes a sky glow does make things darker so would be slightly longer. I haven't used an IR cut yet but then I'm one of the few reflector users and it may not need it as much. No my brain hurts Thanks Carl, starting to make sense even to me
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Post by Deleted on Jan 24, 2014 22:04:31 GMT
Karl i have this filter and it never comes off my nosepiece! Ever! I found it sucks for visual use. But works great with the sammy!
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Post by Deleted on Jan 24, 2014 23:07:50 GMT
Karl i have this filter and it never comes off my nosepiece! Ever! I found it sucks for visual use. But works great with the sammy! That is interesting Chris as you have produced some good shots! That NGC40 was a blinder! I'll try it our again ASAP.
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Post by Deleted on Jan 25, 2014 8:49:55 GMT
Grazie for great tips friends. i hope in some shoots to show in forum.
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