omega filter, build a filter... help

[garethmob]

just wondering if some one could give me a little help its a little technical

i found a site where i can get a sort of cheap not as good but ok CaK filter, but i litterly have to put in all of its specs

i found a old ebay sale which has it

Optical Filter Ultraviolet 394DF15 24.4mm CaK | eBay

and it gives its specs as

CWL 394+-3nm, HBW, Size 25.4m +-.25 mm, Unmounted.

the omega filter site is

BuildaFilter | Omega Filters

now i clicked on other, and onto band pass but i got as far as entering the CWL 394 and got confused lol

if any one can help as it would be a better (cheaper) alternative to buying a baader wedge with cak filter or a lunt cak wedge

i'll only be using this filter in a refractor with baader nd 3.8 imaging film on the end and a camera on the eyepeice

thanks guys

gaz

[Merlin66]

These are very similar specs to the Baader Cak filters...

I bought one and mounted it, with a bit of help from Gaffa tape strips!, into a 1.25" filter holder (Ex-Surplus Shed)

It's been sitting on the desk here for the last month, waiting on some clear skies...

PM me if I can help.

NB this is an imaging filter - NBG for visual.

[garethmob]

thats what i was thinking merlin i only want it for imaging mostly in the megrez on the astrotrac i'll only view with a dedicated scope

the actual filter dosent come in a 1.25 then?

any ideas how i can imput the specs into the omegafilters buildafilter site?

[Merlin66]

Hmm

can't figure it out! But they are expensive!!!

What you want is a:

0391BP010-001 from:

eBay My World - omegabob2

(I can't see one available at the mo but like buses, it will be available soon.)

The filter as supplied is only 25.4mm diameter - too small to fit a 1.25" cell - needs a bit of TLC!)

[garethmob]

are they? oh i didnt know that

it seems omega bob is in charge of omega optical the president so i might give him a message, see if its poss to get a 1.25 version......

thanks merlin wish i never sold the coronado now

sent a message hopefully he will reply soon )

can i ask a faver please merlin, can you post a image of your filter, just so i can see how im going to mount it?

[garethmob]

had a reply, put me through a person in the department, i litterly sent the email and had a reply within 5 minuits from a US company

[garethmob]

um iv just had the quotation for the filter, and um well its alot higher than i expected it to be

$180 and a 10day wait for make

it was only $30 on their ebay site :'(

[Merlin66]

I didn't pay that!

I'll post a photo of my Cak filter.

[garethmob]

neither was it that price on ebay

i think they use the ebay shop to sell off any extra filters or anything that the suppliers rejected

thanks though merlin i guess its back to the "drawing board"