OIII/HA filters

[mariner10 (Steve)]

Might seem like an odd question but does anybody know if it's possible to fit either an OIII or HA filter that suits a 1.25" EP into the photographic line between the OTA and the camera?
I'm using a flattener and an extension tube (10mm) between my 90mm apo and a Canon 550D DSLR.
I'm getting some good results but tried to photograph Sharpless 308 on the weekend and read it's better off with a filter.
Be interested to know.
Cheers.

Steve.

[rustigsmed (Russell)]

Hi Steve,

This is 10mm in width (the same as your spacer) but requires 36mm unmounted filters - not sure if that is a problem for you. http://www.teleskop-express.de/shop/...low-profi.html

Otherwise have you considered the dslr clip in filters? eg http://www.bintel.com.au/Astrophotog...oductview.aspx

Cheers

Russ

[mariner10 (Steve)]

G'day Russ,
Thanks for that, I've not heard of either product so now I have something to think about.
I think the Bintel DSLR clip in filter would be the better option for my set up but having read the description on the site I'm not sure if it's just designed for wide field or not. Any ideas?
Thanks again, appreciate it.

Steve.

Originally Posted by rustigsmed

Hi Steve,

This is 10mm in width (the same as your spacer) but requires 36mm unmounted filters - not sure if that is a problem for you. http://www.teleskop-express.de/shop/...low-profi.html

Otherwise have you considered the dslr clip in filters? eg http://www.bintel.com.au/Astrophotog...oductview.aspx

Cheers

Russ

[rustigsmed (Russell)]

Originally Posted by mariner10

G'day Russ,
Thanks for that, I've not heard of either product so now I have something to think about.
I think the Bintel DSLR clip in filter would be the better option for my set up but having read the description on the site I'm not sure if it's just designed for wide field or not. Any ideas?
Thanks again, appreciate it.

Steve.

G'day Steve,

Sharpless 308 will be a tough target with a dslr I think you'll definitely need a filter and dark skies to make a go of it. There have been some awesome ones posted in the deep sky section over the past year here (Marco, Mike&Trish and atleast one other fantastic version).

I've got a clip in as a wide UV/IR cut and I have just received my slide draw for narrowband (although the 2" version).

eg
https://www.flickr.com/photos/803366...ream/lightbox/


I'm fairly certain they are fine for widefield (which part of the webpage gave you that impression?), the main issue with the clip in is they don't work with EF-S mount lenses (if you were looking at using a camera lens) - although EF mounts work.

The other disadvantage is that the if you wanted narrower than 12nm you can't obtain them. They are also a bit fiddly getting them in and out. Or down the track you purchase a CCD or full frame camera you've invested a lot of money in filters that you need to sell on (that's the main reason why I went for a draw - and to get slightly narrower than 12nm).

Before deciding on the filter draw I recommend emailing the TS to confirm connections etc will work with your flattener.

If you were looking for the Ha clip on bintel its in the wrong section on the webpage http://www.bintel.com.au/Accessories...oductview.aspx

Cheers

Russ

[glend (Glen)]

Or you could mod your Canon for full spectrum which can cost nothing if you do it yourself following Gary Honis' excellent instructions. Or $150 to get it done for you. You can, if your really keen, debayer the sensor and make it a full spectrum mono camera for far less $ than an equivalent pixel CCD. Then cooling the sensor can also give you equivalent Cooled CCD performance - just read RChesire's thread on Cold Finger mods for DSLR in the DIY section here.

[mariner10 (Steve)]

Thanks Russ/Glen,
Dark skies weren't a problem when I tried imaging S308 (for a change) but got no image of it whatsoever so after reading the article in S&T that gave me the idea of trying to image it I noticed it was done using a filter.
I've seen the photos of it posted in the deep sky section so I know it's a gettable object and keen to get a shot. I'll have a look at the linsk you've provided.
I'm not sure why I got the impression the clips were more designed for wide field, probably because I can't quite imagine how they fit into the set up.
A CCD camera down the track is definitely on the cards as well so I take what you're saying about having filters that are no longer useable, good advice.

Glen, thanks for the input.
I'm close to purchasing a 700D/750D so I may very well end up doing what you've suggested with my 550D and go down that path.

Thanks for the suggestions and input guys. More things to think about. Does it ever end?

Steve.

Originally Posted by rustigsmed

G'day Steve,

Sharpless 308 will be a tough target with a dslr I think you'll definitely need a filter and dark skies to make a go of it. There have been some awesome ones posted in the deep sky section over the past year here (Marco, Mike&Trish and atleast one other fantastic version).

I've got a clip in as a wide UV/IR cut and I have just received my slide draw for narrowband (although the 2" version).

eg
https://www.flickr.com/photos/803366...ream/lightbox/


I'm fairly certain they are fine for widefield (which part of the webpage gave you that impression?), the main issue with the clip in is they don't work with EF-S mount lenses (if you were looking at using a camera lens) - although EF mounts work.

The other disadvantage is that the if you wanted narrower than 12nm you can't obtain them. They are also a bit fiddly getting them in and out. Or down the track you purchase a CCD or full frame camera you've invested a lot of money in filters that you need to sell on (that's the main reason why I went for a draw - and to get slightly narrower than 12nm).

Before deciding on the filter draw I recommend emailing the TS to confirm connections etc will work with your flattener.

If you were looking for the Ha clip on bintel its in the wrong section on the webpage http://www.bintel.com.au/Accessories...oductview.aspx

Cheers

Russ

[rustigsmed (Russell)]

Originally Posted by mariner10

Thanks Russ/Glen,
Dark skies weren't a problem when I tried imaging S308 (for a change) but got no image of it whatsoever so after reading the article in S&T that gave me the idea of trying to image it I noticed it was done using a filter.
I've seen the photos of it posted in the deep sky section so I know it's a gettable object and keen to get a shot. I'll have a look at the linsk you've provided.
I'm not sure why I got the impression the clips were more designed for wide field, probably because I can't quite imagine how they fit into the set up.
A CCD camera down the track is definitely on the cards as well so I take what you're saying about having filters that are no longer useable, good advice.

Glen, thanks for the input.
I'm close to purchasing a 700D/750D so I may very well end up doing what you've suggested with my 550D and go down that path.

Thanks for the suggestions and input guys. More things to think about. Does it ever end?

Steve.

Not sure it ever stops Steve actually I purchased my 2nd hand 550d recently, for that exact purpose I will be going mono and cooling with it.

Take a look at the classifieds, there appears to be a baader 36mm unmounted narrowband set in there as of today ...

[Andy01 (Andy)]

[QUOTE=rustigsmed;1169544]G'day Steve,

Sharpless 308 will be a tough target with a dslr I think you'll definitely need a filter and dark skies to make a go of it. There have been some awesome ones posted in the deep sky section over the past year here (Marco, Mike&Trish and atleast one other fantastic version

One of those might have been mine.... http://www.iceinspace.com.au/forum/s...d.php?t=131849

Took 4 nights exposure through a 5nm O3 filter on my mono camera. Just saying that's gonna be a VERY tough target for a DSLR, but nothing ventured

Cheers
Andy