Filters at Rock Bottom Prices

astronut (John) · #1 01-03-2007, 11:07 AM

I have been in contact with the President of Omega Optical in the U.S. concerning the ebay store he runs.
Omega Optical are a producer of all types of filters for all sorts of applications in Industry.
As with most large orders there are always a overrun of material.
With this in mind Bob Johnson makes available at a greatly reduced cost the broadband and narrowband filters that we know as O111, HB etc. At the current exchange rate a 2" O111 HB filter cost del to my door $73AUD. The 1 1/4" is approx $59AUD.
I have just recieved mine and the difference between having the filter and not is amazing. Nebulas that look good in the E/P just jump out at you with more detail.
These spectrum specific filters work better as aperture increases.
Try out the ebay site at bjomejag or send your enquiries to bjomejag@sover.net. Website is www.omegafilters.com

ving (David) · #2 01-03-2007, 11:38 AM

cheap as!!!

not up for a filter at the mo, but i know where to go when i am

thanks John

Phil · #3 01-03-2007, 12:06 PM

just ordered one myself
Phil

casstony · #4 01-03-2007, 04:36 PM

Those look like filters that have not met production criteria (ie. passbands too wide) and are being sold at a discount. Or am I reading the graphs wrong?

astronut (John) · #5 01-03-2007, 06:22 PM

Not to worry Tony. the O111 HB is a fairly wide band filter, but it's main operation is in the O111 line of the spectrum.
Here is a explanation from the supplier

"Precision Interference Filter for EBAY Astronomers that selectively transmits the Hydrogen beta and Oxygen III emission of Galaxies. Specifically produced for EBAY customers, this filter has had significant development to produce excellent transmission of the Oxygen lines at 496.9 nm, 500.4 nm, as well as the 486 Hydrogen, while attenuating most of the background light from other sources. This is a relatively wide pass band nebula filter. The filter is Mounted in a standard 48 mm eye piece ring. Specifications follow: Central Wavelength, To pass 494, and 486 to 500.4 nm with typical 90%, as well as > 50% (Typically 50% of 656.3nm; Size, 1.78 +0-.006 inches (45mm); mounted in 48mm eye piece ring. Thickness 2.1 mm. Filter supplied with actual spectral data."

Quote:

Originally Posted by casstony

Those look like filters that have not met production criteria (ie. passbands too wide) and are being sold at a discount. Or am I reading the graphs wrong?

JethroB76 (Jeff) · #6 01-03-2007, 08:01 PM

How do these OIII filters differ from the DGM OIII filters that Omega also make, which are priced at $85US/1.25" and $170US/2"?

Omaroo (Chris Malikoff) · #7 13-03-2007, 12:52 PM

Today - I just received my two 1.25" O-III filters I ordered through Robs eBay site, which now add to another 2" I bought from Rob at Omega through astronut. Great international service I'll say. The TWO 1.2's landed at my door today for US$88 including shipping. Not bad.

I tried the 2", mounted at the the base of my 2" extension tube in the 8" Newt the other night (with John "astronut"), and was pleasantly greeted with a great contrasty view of the Eta Carinae, Turantula and Orion nebulae. It certainly made a huge difference to the dark lane areas - as advertised. By mounting it to the extension tube I can use the same filter for 2" and 1.25" EP's as usual by merely swapping the adapter above it.

I bought two of the 1.25" so that I can use both at the same time on the bino-newt that is in the works.

I guess that the other filters mentioned might be better in some way - but my human frailties and eyesight will probably prevent me from getting any better value from them. For the price, these are great.

Thanks John - a great pickup!

Phil · #8 13-03-2007, 07:29 PM

my just turn up today lucky nothing wrong with it
Phil

Omaroo (Chris Malikoff) · #9 13-03-2007, 10:21 PM

Quote:

Originally Posted by Phil

my just turn up today lucky nothing wrong with it
Phil

Lucky? Phil - just out of interest, were you expecting it not to work... or just not get to you because it was off ebay?

Phil · #10 13-03-2007, 10:43 PM

it turn up with no case.

Omaroo (Chris Malikoff) · #11 13-03-2007, 11:21 PM

No - they come in a padded envelope and are individually wrapped in a padded pouch.

skies2clear · #12 15-03-2007, 10:47 AM

Hi all,

which OIII filter did you order? I thought I saw 2 types advertised, HB and OIII Nebula and also the Filter 486, Hb and OIII Nebula II filter. They appear to have different transmission characteristics.

Any thoughts appreciated? I'm not sure which is better suited for visual astronomy,

Clear skies.

Omaroo (Chris Malikoff) · #13 15-03-2007, 11:01 AM

I've ordered and received 2 x 1.25" and 1 x 2" "HB and OIII Nebula" filters. Total (landed) for the two 1.25's was US$88 and US$50 for the 2".

Cheers
Chris

skies2clear · #14 15-03-2007, 12:01 PM

Quote:

Originally Posted by Omaroo

I've ordered and received 2 x 1.25" and 1 x 2" "HB and OIII Nebula" filters. Total (landed) for the two 1.25's was US$88 and US$50 for the 2".

Cheers
Chris

Thanks Chris. Did you happen to notice what I said about the 2 filters types though? I might send them an email to clarify.

I tried to look up some of the other brand OIII filter transmission curves, but many don't seem to publish them on their websites unfortunately to compare.

Clear skies,
Nick

Erik Wilcox · #15 20-03-2007, 01:52 PM

Those are some great deals. I had trouble understanding exactly what type of filters were being sold though. I'd like to see them make it more clear that it's an OIII, broadband, etc...