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Cannot understand how to adapt the BaaderU to my camera

14 replies to this topic

#1 bsas

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Posted 27 August 2019 - 18:43

So, before I buy this expensive filter I really need to understand it. If I read it properly, the 2" model has a weird 50.8mm filter thread. So, I guess I need an adapter for that size to standard sizes (like 49mm, 52mm or 58mm) right? Which adapter I should get?

Also, the the BaaderU the highest transmission UV filter out there (even compared to stacks)? I really need very high transmission to do videos but whatever I can save I want since I am short on budget after paying for my full-spectrum conversion :(

Thanks all, sorry for the dumb question but it is confusing for me :(

#2 Herman1705

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Posted 27 August 2019 - 18:52

View Postbsas, on 27 August 2019 - 18:43, said:

.... If I read it properly, the 2" model has a weird 50.8mm filter thread. So, I guess I need an adapter for that size to standard sizes (like 49mm, 52mm or 58mm) right? Which adapter I should get?

An adapter with a 48mm thread should fit.


Herman

#3 bsas

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Posted 27 August 2019 - 19:37

View PostHerman1705, on 27 August 2019 - 18:52, said:

An adapter with a 48mm thread should fit.

Herman

That makes me even more confused :(
2" is 50.8mm... so, how an 48mm fits? Are the threads smaller then the glass on those filters?

#4 Herman1705

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Posted 27 August 2019 - 20:12

The filter itself is only 45.5 mm diameter.

Attached Image: DSC07042.JPG

#5 bsas

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Posted 27 August 2019 - 20:31

Cool, thanks, good to know.
But then, why it is called 2"? Is it a marketing lingo?

#6 SteveE

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Posted 27 August 2019 - 21:29

It is an astronomy filter. Its intended purpose is to fit into 2 inch telescope eyepieces via the standardized filter thread for 2 inch eyepieces.

Edited by SteveE, 27 August 2019 - 21:31.

- Steve

#7 bsas

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Posted 27 August 2019 - 21:30

View PostSteveE, on 27 August 2019 - 21:29, said:

It is an astronomy filter. Its intended purpose is to fit into 2 inch telescope eyepieces.

Awesome! Now I understand (that makes sense). Thanks! :D

#8 dabateman

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Posted 27 August 2019 - 21:30

No its Astrophotography or Astronomy lingo. There are 24mm (1 inch), 31.5mm (1.25 inch), and 48mm (2 inch) filters.
You can even stumble on a lens with these odd sizes. My Peleng 8mm fisheye has a back 1.25 inch thread. But there is also an inner thread that I adapted to 25mm.
To add confusion in Astrophotography the frameless filters have odd sizes like 36mm.

The Baader venus filter is first an Astrophotography filter, second an amazing expensive UV photography filter.

But you may consider a 330WB80 improved filter. Its cheaper and very good. Message the seller and see if he can still mount it for you. Last I heard he could mount it in a 28mm ring.

Edited by dabateman, 27 August 2019 - 21:37.


#9 Andy Perrin

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Posted 27 August 2019 - 22:30

I like the 330WB80 also. Very cheap by comparison, and not all that different in the end results.

#10 Cadmium

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Posted 28 August 2019 - 05:39

Well here is how I did it. I removed the Baader U glass from its frame/ring.
I got a 52mm to 48mm step down ring, I put a retaining ring in both sides, and sandwiched the Baader U glass in the middle.
That solution is for my 52mm threaded lenses. However, turns out my best UV lens has 46mm threads, so I use a 46mm to 52mm step up ring for my Baader U now.

Attached Image: DSC_2093_baader.jpg

#11 UlfW

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Posted 28 August 2019 - 06:45

The drawback with Cadmium's solution above is that there is no inner threads at the front.
Dichroic filters more often require lens shades mounted in such threads.

I stacked step-up and step-down rings, 52mm-48mm + 48-52mm to get the front thread and used one retaining ring instead.
The thread in the step-down ring goes all the way from front to back. I think I borrowed the original retaining ring from the Baader filter cell.
All stap-rings are hidden under label tape and difficult to show.
Ulf Wilhelmson
Curious and trying to see the invisible.

#12 JMC

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Posted 28 August 2019 - 07:41

I Just mounted mine in a 49mm filter ring. Fairly standard size, easy to get a 52mm to 49mm step down ring if needed, and threaded on the forward side for adding a hood.

#13 Cadmium

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Posted 29 August 2019 - 01:09

View PostUlfW, on 28 August 2019 - 06:45, said:

The drawback with Cadmium's solution above is that there is no inner threads at the front.
Dichroic filters more often require lens shades mounted in such threads.

I stacked step-up and step-down rings, 52mm-48mm + 48-52mm to get the front thread and used one retaining ring instead.
The thread in the step-down ring goes all the way from front to back. I think I borrowed the original retaining ring from the Baader filter cell.
All stap-rings are hidden under label tape and difficult to show.

No, that is an old photo, I have way since then adjusted the two retaining rings to move the Baader U glass further to the read, so it has plenty of front thread to park your hood, filters...

#14 enricosavazzi

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Posted 30 August 2019 - 17:03

Yet another way to remount the glass of the Baader U is by using the filter ring of a 52 mm B+W filter, which usually has 52 mm front and rear threads, a broad shoulder, and a smaller female thread and retaining ring accessible from the rear. It usually accepts filter glass from 46 to 49 mm diameter (but I have seen also different B+W Pro filter rings).
-- Enrico Savazzi

#15 enricosavazzi

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Posted 30 August 2019 - 17:03

Yet another way to remount the glass of the Baader U is by using the filter ring of a 52 mm B+W filter, which usually has 52 mm front and rear threads, a broad shoulder, and a smaller female thread and retaining ring accessible from the rear. It usually accepts filter glass from 46 to 49 mm diameter (but I have seen also different B+W Pro filter rings).
-- Enrico Savazzi