21st May 2023 Altair G-band filter test

[Peterm]

Amazing images Alexandra!

[Montana]

Thanks guys

Bojan, I didn't look visually because my Herschel wedge is currently set up for imaging (low ND filters). I would have had to add a few more ND filters for visual use.

Alexandra

[christian viladrich]

I couldn't gather from the post, did you use it visually? Could you discern a difference between it and the baader visually ?

Hi Bojan,

I have three different G-band filters : Edmund Optics 10 nm, Andover 1.9 nm and Altair 2 nm.

The Andover 1.9 nm is the best overall filter I have for visual observation with my Taka TOA 150. It vastly outperforms the 540 nm continuum in terms of contrast, visibility of granulation and facular plages. I find the violet color most pleasant, but this is just a personnal taste.

I don't expect the Altair 2 nm to be much dfferent than the Andover 1.9 nm. I have not tried it yet visually.

Christian

[DeepSolar64]

Christian,
I also have the Edmund Optical 10nm Gband filter. What is your assessment of it?

James

[Rob63]

Ordered, you really should be on commission Alexandra

[SteveZ]

Alexandra,

Thanks for the test report. The G-Band captures look great. I need to get one on order.

Steve

[vineyard]

Thanks for sharing Alexandra - looks very interesting. I'm looking forward to seeing some comparison shots between the G-band and CaK or CaH to see whether there is a huge difference between them or not. Cheers!

[christian viladrich]

Thanks for sharing Alexandra - looks very interesting. I'm looking forward to seeing some comparison shots between the G-band and CaK or CaH to see whether there is a huge difference between them or not. Cheers!

So, keep tuned :tomorrow, I'll post a comparison between Antlia 393-3 nm, Altair G-band, Alluxa Ca K 0.37 nm, 0.14 nm, and 0.37 + 0.14 nm ;-)

[DeepSolar64]

Thanks for sharing Alexandra - looks very interesting. I'm looking forward to seeing some comparison shots between the G-band and CaK or CaH to see whether there is a huge difference between them or not. Cheers!

So, keep tuned :tomorrow, I'll post a comparison between Antlia 393-3 nm, Altair G-band, Alluxa Ca K 0.37 nm, 0.14 nm, and 0.37 + 0.14 nm ;-)

430nm Gband 10nm?

[christian viladrich]

Thanks everyone for all the kind words, I enjoyed testing and comparing these filters. I did notice that my TiO filter was clouded over and degraded and I couldn't get focus another solar filter bites the dust! one in, one out.

Alexandra

BTW, what is the bandpass of the TiO filter ? Where did you buy it from ?

[p1taylor]

Excellent, Alexandra. All of the images look great, Very nice.

petr

[Montana]

Thanks

Christian, I bought it from Omega optical about 10-12 years ago, it was one of the first filters I bought. To know the details of it would require me to be a lot more organised than I am. It may take a big search to find the order sheet with the spectra on it

Alexandra

[robert]

Hmmm
Thanks for an interesting post!

[christian viladrich]

Thanks

Christian, I bought it from Omega optical about 10-12 years ago, it was one of the first filters I bought. To know the details of it would require me to be a lot more organised than I am. It may take a big search to find the order sheet with the spectra on it

Alexandra

Don't bother with it Alexandre. It was just out of curiosity ;-)

[vince22]

Thanks guys
That's great Vince, they should give me a commission

Alexandra

:-). Yes they should !!!

The filter arrive superfast … 3 days ago … and extra cost are really expensive ( duty cost , more than 30% )
But for me the filter worth the buy ..

I test yesterday and today … with my fs 128 …
I will post the pic when i find the time to work on the avi ..

But, i am happy with the filter ..
thanks Alexandra

[DeepSolar64]

I test yesterday and today … with my fs 128 …_vince22

Vince, you have a Tak!!?

[MapleRidge]

Hi Alexandra...

Thanks for the post on this filter

It convinced me to buy one...I should have it by the end of the coming week.

Brian

[PEterW]

Be interested in a visual comparison on a medium sized scope between continuum, “improved” continuum and this new g-band filter. Time to dust off the old kit and see what new things have come along!

Peter

[eroel]

Alexandra:
A super comparo session.
Thanks.
Eric.