Anyone find the Antilia ALP-T filter over exposing the red SII channel on brighter nebulas, whereas the l optolong l extreme does not? Using the zwo2600 mc pro on the asiair
Antilia ALP-T over exposing the red channel
I'm confused as to which version of the ALP-T you have? There's one that captures the Ha and OIII emissions similar to the Optolong L-Extreme and a comparision would be warranted. That being said, Antlia also has a variation of the ALP-T that captures the SII and Hb emissions, but I'm not aware of a variation of the L-extreme that does this, so I'm unsure how you would compare the two.
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My apologies, off the box the filter is a: ALP-T Dual band 5nm Narrowband 2" filter Ha & O3
I don't have any issue with the filter. Maybe you see the red channel overexposed because in more emission nebulas Ha is the strongest wavelength
Here is a good example. (Note, both look bad) but I applied a heavy crop. Both had the same imaging time and processing
But the 2nd one you can see the lop left is more blown out. The top one using the L Extreme is not as bad.
This happened with the Flaming Star Nebula and the rosette nebula, both also having strong O3 signals.
But the 2nd one you can see the lop left is more blown out. The top one using the L Extreme is not as bad.
This happened with the Flaming Star Nebula and the rosette nebula, both also having strong O3 signals.
So the filters are slightly different in regards to bandwidth. The l-extreme is a 7nm's in the Ha and OIII and the ALP-T is 5nm's bandwidth. I'm wondering if this would increase the contrast of the ALP-T image as the background would be slightly darker.
I've owned both filters and hands down I would keep the ALP-T over the L-extreme. The halo's around bright stars with the l-extreme could be challenging to minimize.
I've owned both filters and hands down I would keep the ALP-T over the L-extreme. The halo's around bright stars with the l-extreme could be challenging to minimize.
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You'll never be overexposed in the S2 channel not with this filter or any filter OSC or mono
You'll always be clipping on stars when using duo narrowband on OSC
You'll always be clipping on stars when using duo narrowband on OSC
I think the Antlia has a better contrast here and the other reason to think of too much red signal would be your own monitor? Is it a calibrated monitor or a Gaming Monitor with a gaming mode to pop colours?
I was looking at your photos and I can see you're using the Antlia ALP-T Highspeed filter with an f/7 refractor. You should better use the non highspeed version with that, as the highspeed variant is for f/2-f/3.6 optics.
I was looking at your photos and I can see you're using the Antlia ALP-T Highspeed filter with an f/7 refractor. You should better use the non highspeed version with that, as the highspeed variant is for f/2-f/3.6 optics.
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