1.25" filters with ED80 flattener.

[Astrocookie]

Hi

 

I'm thinking of getting a SW corrector/flattener to match my ED80 Pro.

 

Problem is.. Is there a way I can use my 1.25" filters, just short term until I can go for 2" ones.

 

I know it defeats the object, narrowing the light path, but one purchase at a time 

 

Help please. 

[philjay]

Hi Paul

I presume you would be using them with the Canon 300d, if so then you will get vignetting no matter how close you put them to the camera. I know coause I went through exactly the same thing when I started imaging. With DSLRs as you know get the biggest adapter and filters to cut down on vignetting. If your using a smaller chipped CCD then no problem, that's what I use at the mo with my Atik 314l

[Guest Kheldar]

As Phil says it's going to vignette a DSLR - it's really, really, really a bad idea

Edited May 14, 2014 by Kheldar

[Astrocookie]

Thanks for the feedback.

 

I'm currently using the ED80 with the 1.25" T-piece adapter.

 

Yes I get vignetting but it's acceptable for now.

 

I was just wondering, as an interim, if there's a way of using the flattener with my 1.25" filters (IR/UV cut)

 

I will, overtime upgrade to 2".... Already got a 2" LP filter. 

[Guest Kheldar]

Flattener - FLO Flattener 2" Nosepiece - 2" to 1.25" Drop down adaptor - 1.25" Filter

 

http://www.firstlightoptics.com/adaptors/flo-adapter-for-skywatcher-focal-reducers.html

 

http://www.astro-shop.com/Adapter-M48-auf-M28-5.html

 

Points to note:

 

I believe the money would be better invested in buying a replacement internal IR cut filter for the DSLR (Baader do one I think?)

 

Ultimately 2" is not the best option for DSLR due to many reasons, clip filters would make more sense

 

Caveat:

 

I still think this is daft

Edited May 14, 2014 by Kheldar

[Astrocookie]

Which part do you think is daft? (Sob) :,-|

Edited May 14, 2014 by Astrocookie

[Guest Kheldar]

Which part do you think is daft? (Sob) :,-|

 

All of it I'm afraid, putting a 1.25 filter in the chain with an ED80, flattener and DSLR is just a crime

 

My suggestion would be to sell the filter, put the money towards this (£55)

 

http://www.modernastronomy.com/filtersBaader.htm#eosConversionFilter

 

and this (£15)

 

http://www.firstlightoptics.com/adaptors/skywatcher-dslr-m48-ring-adapter.html

 

Then it all screws together and leaves maximum possible aperture open

Edited May 14, 2014 by Kheldar

[Astrocookie]

Nice one Stephen

I shall be a good boy then.

Thanks for the advise. May as well do it right :-)

Cheers

Paul