zwo camera for use on RASA 11 Celestron

[JA]

Originally Posted by h0ughy

i took down the rasa from the doghouse this afternoon and packed it away ready for SPSP.

But i did take images of the adapter that Celestron provided. the canon adapter was mine

Based on those images and the specified dimensions in the Celestron drawing, it seems like there would be no internal interference and that it would be a relatively easy modification as per my earlier drawing / proposal and allow you to use a wide selection of 2 inch / M48 filters.

Best
JA

[h0ughy (David)]

Originally Posted by JA

Based on those images and the specified dimensions in the Celestron drawing, it seems like there would be no internal interference and that it would be a relatively easy modification as per my earlier drawing / proposal and allow you to use a wide selection of 2 inch / M48 filters.

Best
JA

I do agree but may have to see if it can be made

[bert (Brett)]

Originally Posted by h0ughy

i have a one shot as well but not the asi1600, however do you use a uvir?

Are you sure that the filter that comes with the scope isn't ir/uv blocked?

No, I don't. Thats more a refractor thing for me, to minimise CA. Because I'm one shot colour, the uv and ir would likely be blocking those wavelengths anyways. even if they are not, I don't really care.

[h0ughy (David)]

Originally Posted by bert

Are you sure that the filter that comes with the scope isn't ir/uv blocked?

No, I don't. Thats more a refractor thing for me, to minimise CA. Because I'm one shot colour, the uv and ir would likely be blocking those wavelengths anyways. even if they are not, I don't really care.

Not sure

[h0ughy (David)]

The filter info is here but haven't clue what is what

[Merlin66 (Ken)]

David,
That's a light pollution filter, but also has UV/IR cut-off.

Looking at the QE curve of the sensor, I'd think you'd probably need a UV/IR filter to reduce star bloating.

[h0ughy (David)]

Originally Posted by Merlin66

David,
That's a light pollution filter, but also has UV/IR cut-off.

Looking at the QE curve of the sensor, I'd think you'd probably need a UV/IR filter to reduce star bloating.

Fantastic to see someone can understand that. With a coloured crayon can you show me where it falls short? Thank you for pointing that out

[Merlin66 (Ken)]

No coloured crayon required....
The transmission curve drops to zero below 4000A and above 7000A. Therefore no (!??) transmission in these areas.

My comment re UV/IR filters was as an alternative to this light pollution filter (this filter, besides cutting out unwanted light also cuts out some useful light.)
Sorry if there was some confusion.

[h0ughy (David)]

So I can just use the RASA light pollution filter and should be OK?

[Merlin66 (Ken)]

Yes.
This would work fine as a starting point.
Ken

[h0ughy (David)]

awesome - the ASI071 arrived today - ended up getting this second hand saving a few hundred off a new one

[h0ughy (David)]

next piece of the puzzle arrived today - the astrozap dew shield especially for the RASA. now i am getting it together i am coming down with a cold, the other reason apart from cloud why i am not at Wiruna today for SPSP.

its a quality product - apart from me snot everything is equal

[h0ughy (David)]

between the cloud i managed to get focus of the RASA with the ASI071. this is without darks and bias and flats. its just 5 x 1min at 0 gain camera set at -5deg C. the RASA light pollution filter is fitted
processed in Pixinsight but i noticed the focus was out slightly

[LewisM]

Dave, your full name and address is in one photo of the box. Might want to censor that.

Nice initial shot!