Omeag Bob's Ca H filters.
- Valery
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Omeag Bob's Ca H filters.
Hi all,
I just visited Bob's eBay page with ads of this filter Ca H.
The ads says it is 2A filter. But the graph shows that this is almost 5A FWHM filter!
Why Bob is trying to make his filters sound better than they are??? His prices are good,
but the filters must be advertised as they are, not with false band pass WFHM value.
Valery.
I just visited Bob's eBay page with ads of this filter Ca H.
The ads says it is 2A filter. But the graph shows that this is almost 5A FWHM filter!
Why Bob is trying to make his filters sound better than they are??? His prices are good,
but the filters must be advertised as they are, not with false band pass WFHM value.
Valery.
"Solar H alpha activity is the most dynamic and compelling thing you can see in a telescope, so spend accordingly." (c) Bob Yoesle.
Largest full size 185 - 356mm Dielectric Energy Rejection Filters (D-ERF) by ARIES Instruments.
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- marktownley
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Re: Omeag Bob's Ca H filters.
Just one of the many reasons I take them with caution...
http://brierleyhillsolar.blogspot.co.uk/
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- Montana
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Re: Omeag Bob's Ca H filters.
That's a bummer! I'm not expecting much out of this filter when it comes then. Oh well, you can all say I told you so. I'll give a frank opinion of it and you can all save your money
Alexandra
Alexandra
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Re: Omeag Bob's Ca H filters.
No, we wouldn't do that, it would be mean, and we're not like that. However we are all genuinely interested how you get on with it and what you find.Montana wrote:That's a bummer! I'm not expecting much out of this filter when it comes then. Oh well, you can all say I told you so. I'll give a frank opinion of it and you can all save your money
Alexandra
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- swisswalter
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Re: Omeag Bob's Ca H filters.
Montana wrote:That's a bummer! I'm not expecting much out of this filter when it comes then. Oh well, you can all say I told you so. I'll give a frank opinion of it and you can all save your money
Alexandra
Hi Alexandra
you sure have seen my comparison CaK / Ca H II (Daystar) so that is what you should get with Bob's filter
http://solarchat.natca.net/viewtopic.php?f=4&t=14370
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
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Re: Omeag Bob's Ca H filters.
"you sure have seen my comparison CaK / Ca H II (Daystar) so that is what you should get with Bob's filter"
caK was made by who?
CaH looks more washed out compared to caK which caH filter from daystar is that?
caK was made by who?
CaH looks more washed out compared to caK which caH filter from daystar is that?
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Re: Omeag Bob's Ca H filters.
also I did a search on "ca H solar photos"
a few came up and had stated 5A bandwidth
I did notice ca H in general not as dramatic as caK
is daystar 4-5A also? is this wider bandwidth because it was designed for visual use?
a few came up and had stated 5A bandwidth
I did notice ca H in general not as dramatic as caK
is daystar 4-5A also? is this wider bandwidth because it was designed for visual use?
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Re: Omeag Bob's Ca H filters.
scan thru this web site see ca H 5A pictures scattered thru out
http://www.hydrogenalpha.com/
http://www.hydrogenalpha.com/
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Re: Omeag Bob's Ca H filters.
Valery ,Mark I agree that you should state true bandpass
but IMHO and this is just a WAG(wild ass guess) . bob basically copied what others have done
and replicated it for 299
found another
http://www.icstars.com/HTML/SolarSectio ... Oct21.html
but IMHO and this is just a WAG(wild ass guess) . bob basically copied what others have done
and replicated it for 299
found another
http://www.icstars.com/HTML/SolarSectio ... Oct21.html
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Re: Omeag Bob's Ca H filters.
Hi Johnhighfnum wrote:"you sure have seen my comparison CaK / Ca H II (Daystar) so that is what you should get with Bob's filter"
caK was made by who?
CaH looks more washed out compared to caK which caH filter from daystar is that?
These are my own pics. All made withhin an hour
CaII H, 3969 A, Hw 5A, operating temp 73 F
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
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Re: Omeag Bob's Ca H filters.
Hi Johnhighfnum wrote:Walter
so your cah is a daystar??
yes, see my reply above
Only stardust in the wind, some fine and some less fine scopes, filters and adapters as well. Switzerland 47 N, 9 E, in the heart of EUROPE
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
from 7 am - 7 pm http://www.nanosys.ch
from 7.01 pm - 6.59 am http://www.wastronomiko.com some times vice versa
- Montana
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Re: Omeag Bob's Ca H filters.
Well, my Calcium H came yesterday. The hubby was in a stinking mood as he was stung for an extra 20% by the postman. I forgot that! I wish Bob wouln't put $299 on the envelope
On close inspection the filter looks very nice and comes in a threaded holder. However, the data sheet shows 5A and not 2A as stated. I will test it though in the next few weeks (usually by the second week in Feb) but it may be a return as I feel it will not do the job. I hope the taxman will give me back my 20% as well.
Alexandra
On close inspection the filter looks very nice and comes in a threaded holder. However, the data sheet shows 5A and not 2A as stated. I will test it though in the next few weeks (usually by the second week in Feb) but it may be a return as I feel it will not do the job. I hope the taxman will give me back my 20% as well.
Alexandra
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Re: Omeag Bob's Ca H filters.
Looks like bob simply copied other vendor band pass
I'm getting 'booster' filter for Ca H from bob based on Valery suugestion
Ill let you know asap
not defending bob
but filter is same performance at approx 1/10 cost of more expensive vendor
Also i didsome research
Ca h id more muted because it from higher
level in atmosphere
I find it interesting it its own right
I'm getting 'booster' filter for Ca H from bob based on Valery suugestion
Ill let you know asap
not defending bob
but filter is same performance at approx 1/10 cost of more expensive vendor
Also i didsome research
Ca h id more muted because it from higher
level in atmosphere
I find it interesting it its own right
- Montana
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Re: Omeag Bob's Ca H filters.
We'll see but I wouldn't call CaH muted http://solarchat.natca.net/viewtopic.php?f=8&t=14283
However, yes http://www.company7.com/daystar/products.html here they say the CaH band is around 10-12A wide and the picture from their 5A CaH filter looks the same as the one you took with Bob's. However you need around 2A to see the interesting centre line like in Wah's image. Like for CaK, a Baader K line filter is quite uninteresting compared to a CaK PST
Alexandra
However, yes http://www.company7.com/daystar/products.html here they say the CaH band is around 10-12A wide and the picture from their 5A CaH filter looks the same as the one you took with Bob's. However you need around 2A to see the interesting centre line like in Wah's image. Like for CaK, a Baader K line filter is quite uninteresting compared to a CaK PST
Alexandra
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Re: Omeag Bob's Ca H filters.
Did quick preliminary
view was a bit improved
but still not like cak
will try sunday with skybender
view was a bit improved
but still not like cak
will try sunday with skybender
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Re: Omeag Bob's Ca H filters.
"We'll see but I wouldn't call CaH muted viewtopic.php?f=8&t=14283"
Montana do you know bandpass for this image ?
I searched on internet - I could not find an filter caH images that compare to SHG caH images
It seems filter type caH are 5A or more
Montana do you know bandpass for this image ?
I searched on internet - I could not find an filter caH images that compare to SHG caH images
It seems filter type caH are 5A or more
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