Jump to content

sgl_imaging_challenge_2021_annual.thumb.jpg.3fc34f695a81b16210333189a3162ac7.jpg

50.8mm, 50mm, 2" filters???


Recommended Posts

I'm thinking about stepping up the filter size, but I'm at loss regarding the many different sizes around the 2" mark...

The new Atik EFW3 comes with wheels in either 2" or 50.8mm according to FLO. To me that's pretty much the same dimension. Astrodon sell 50mm unmounted, so what version of this FW would I need?

/Jesper

Link to post
Share on other sites

You get slightly more clear aperture with the 'unmounted 2 inch' option. The threaded filter holders of the 'mounted' variety eat slightly into the aperture. We have both systems parallel here in the dual Tak106 rig at F5. To be honest the difference is not that great and not enough to worry about, but unmounted would be the better choice. At F7 on the TEC 140 there is almost no vignetting with the 2 inch mounted.

Of greater significance is the fact that Astrodon don't do 2 inch mounted, so if you want to go for their NB filters this is the carousel you'll need. 

I only know these setups as '2 inch mounted' and '2 inch unmounted' so I'm not sure which is which in mm but I suppose the unmounted are the slightly larger ones. Do check that!!!

Olly

Link to post
Share on other sites
12 minutes ago, ollypenrice said:

Do check that!!!

Yes indeed!

filters.thumb.JPG.a0b467cc286f63912bc09ff3a0cac3f5.JPG

I'm confused by the options here. Giving it another thought I realize that 2" is 50.08mm and not 50.8mm but that hasn't solved the mystery.

All I ever used was 1" or 2" mounted filters. Gives me something to hold on to as I handle them...

/Jesper

Link to post
Share on other sites
2 hours ago, Jessun said:

Yes, odd mistake to do. In any case the Astrodon filters are listed as 50mm.

/Jesper

That'll be 50mm of glass. The remaining 0.8 mm won't be enough to accommodate the threaded holder, presumably.

Olly

 

Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Recently Browsing   0 members

    No registered users viewing this page.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.