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| Hey all. Is it me or is the offerings for many filters, especially narrow bands of all variants far fewer in the 1.25 size? For example of the few SII / OIII dual narrowband filters I don’t see any at 1.25. All of the ASKAR Color magic choices seem to be 2” as well in addition to the Antlia Quad band. Is it me and I just am not looking correctly or enough or am I pretty much right in this? |
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well there is a few here https://agenaastro.com/optical-accessories/filters/narrowband-imaging-filter/shopby/1_25_inch-idas_filters-zwo_astronomy_cameras-optolong.html?stock=1 I'll look in FLO and HPS too |
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| HPS has a few more, but they're crappy beginner's light pollution filters |
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so I think you're right; there are more dual/multiband imaging filters for 2 inch mounted format, than for 1.25. but the 1.25 L-extreme is a good filter |
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so I think you're right; there are more dual/multiband imaging filters for 2 inch mounted format, than for 1.25. thanks for looking. Optolong does seem to be probably the best in terms of making them in both size formats. What remains completely elusive is an SII / OIII dual NB in the 1.25 format. I wanted to purchase a ZWO filter wheel. I much prefer the smaller format of the mini as I’m fine with just the 5 spaces at the moment. But if my choices will be much more limited in the 1.25 size I feel I am sort of being nudged into the 2” format for the filter wheel. |
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you can still use a single band SII 1.25 inch filter with a color camera or you can instead use the 2 inch format dual band filters but if you are not gonna fill in all slots of the filter wheel, I suggest you read all about this first or I'm gonna feel guilty for not warning you https://www.astrobin.com/forum/c/equipment-forums/zwo-efw-7-x-2/zwo-filter-wheel-not-holding-center-position-during-imaging/ that's for the 7x2; maybe you wont get this problem with a 5x2. If you do get imbalance issues, you can try filling the empty slots with dark frame imaging filters. |
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you can still use a single band SII 1.25 inch filter with a color camera That’s a good heads up thank you! You make a good point. I gravitated to the dual SII / OIII since SII is so weak I would be burning a lot of imaging time for a weak signal - still useful to have though which is why I said if I have the dual at least I’m getting even more OIII. If that makes sense. |
