fwm891
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Posts posted by fwm891
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18 minutes ago, DaveS said:
What camera / filters are you using (Sorry if I missed the post)? Only I'm seeing some huge blue / violet halos around bright stars.
Hi Dave - Camera is the ASI 294MC Pro, the filter is an IDAS NB-1 dual narrow band. I've had to mount the filter the wrong way round at present - I need an adapter to reverse it so it faces to sky with it's front face. Getting there. It also seems to be missing some H-alpha probably for the same reason.
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Second light night images
These are imaged and process in the same way as those above. Just enjoying getting images at the moment - work on the teckie sides latter when I get more familiar with the scope/camera/filter combos.
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2 hours ago, sloz1664 said:
That's some photo hoover Francis. Cracking images for such short exposures. How well does it hold focus during a session?
Steve
Holds focus well. Though temps have been quite stable over the short sessions I've had over the last few days- time will tell
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12 minutes ago, Mark at Beaufort said:
Francis really great astro photos. You certainly have a talent. Hopefully, I will see you next weekend.
Thanks Mark - You should see me at some stage next week end. Really want to meet some of the SGLer's and FLOer's in person
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7 minutes ago, Grant said:
Lovely first light images Francis - shows the potential of the RASA 8 and the what can be done with short subs / less data. Really nice fields of view too.
Look forwards to seeing more of these - I'm getting very tempted to have a play with one of these RASA 8's myself....
Thanks Grant, Still a few bits to sort out. The quoted 25mm spacing definitely requires a filter of some sort in place. I seem to have knocked the mount at some stage the stars at the edges/corners look like a PA adjustment is needed.
I think this scope could become addictive...
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First light session with a Celestron RASA 8, Baader NB-1 filter, ASI294MC Pro. Guided with PHD2 on an iOptron CEM60 standard mount.
Subs: 8 x 120s
Processing via APP (to integration) then PI for colour work
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Few more from first light session. Process change:
Initial process for these were APP to integration then PI for colour work.
Horse head (IC434) 5x 120s
M42 10x30s 10x60s 6x120s
Rosette ngc4422 5x120s
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Woke (too) early this morning to find it clear 🙂 as the RASA was still set-up from last evenings efforts I decided to try a few targets. IC405 is the only one processed at the moment. The image comprises 10x 120s subs, gain 122 offset 30 on the ASI294 MC Pro.
I can see that at some stage I've upset the PA but still like the image.
CEM60 Standard mount, processed in PI no calibration frames. Process after integration: ABE, Background neutralisation, colour calibration, saturation and histogram transformation - saved as 16 bit tiff and 8 bit jpg.
More to follow if I can stay awake...
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Well an improvement but I think I still have a spacing issue....
Shot through cloud (it was there when I set-up) just disappeared as soon as I started the sequence run. Captured the smiley face anyway 🙂
1 minute sub on ngc6995. RASA 8 ASI 2994 MC Pro. Processed in PI.
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Be my first SGL SP so looking forward to seeing some of the mug shots for real! (you may not feel the same)...
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Frightening when your new scope throws a wobbly on it's first outing.
Thankfully the causes have been found (hopefully). First was cables from the camera didn't have enough slack and when I pushed the dew shield on it tightened them further pulling the camera to one side. Next which only aided the former was that the Baader filter draw wasn't fully tightened against the RASA T thread so there was a little play. It felt tight enough when I set up, but only after having to shut down pronto because there was wet stuff falling I found it turned about an eighth of a turn further...
So you can see on the images that the focus is a vertical area approximately central with focus falling off each side due to camera tilt. I found that the threads between the filter drawer and the RASA T thread mounting plate were binding which is why I thought they were tight. A little touch of candle wax on the thread has stopped the binding and the two parts fit together easily.
The images: The white light was 5 x 120s subs - Gain 120 offset 30. The NB image (using an IDAS NB-1 filter) was 5 x 180s.
Sadly rain cut short this first light. Interestingly though these were processed in PI but I had no calibration subs so these are light frames only and the dreaded amp-glow isn't there. ABE cured the illumination across the frame. Must try this again with more subs...
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Probably NOT dithering you've strengthened the R/B pixels. Always good to dither as you break-up/even out the background noise.
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I purchased an 8 inch f2.0 RASA (Rowe-Ackermann Schmidt Astrograph) from FLO. It arrived via DPD this afternoon along with an IDAS NB-1 filter.
The OTA was double boxed in heavy weight cardboard with ridged foam inserts to provide support and cushioning. All OK removing the scope from the box.
I have a Celestron motor focuser from another scope so I spent some time fitting that and calibrating. No problems (yet), I decided to tinker around in doors rather than in the observatory as I have more room in the kitchen.
I connected everything up via a Pegasus Pocket power box to the lappy. Downloaded the latest drivers for the motor focuser from Celestron.
I run SG Pro as my pointing/tracking/capture software, it recognised the focus motor, the Pegasus power box, the asi120mm (on the 9 x50 guide scope) and the ASI 294MC Pro on the RASA. Great stuff.
Then I hit a snag. I needed to take the glass filter out of the RASA as I intend to use filters with this OTA and Celestron don't recommend using multiple glass filters due to focus shift and the sweet plane is quite critical with the 8 inch RASA. There are 2 little notches either side of the glass window but it was screwed in too tight to remove unaided - I ended up getting a short engineers rule, engaging that in the notches and un screwing it that way.
I'm using a Baader universal filter drawer with a 2" insert allowing me to swap filters as needed although at present it will be either a UV/IR cut filter for straight OSC recording or the IDAS NB-1 to capture Ha and OIII/Hb.
So I positioned it on a worktop and pointed it outside at a distant tree. All connected through SGPro and the focuser refused to work. Ran on the Celestron calibration software but refused to run through SGPro. After a great deal of faffing about I found the problem: Both the Pegasus Pocket Power box and the focuser were trying to communicate through the same comm port. Why is it I never go for the simple stuff first....
Anyway with that sorted it was easy to focus on the tree then align the finder/guider scope up with the RASA.
Once I get round to seeing some stars I'll do a first light review
TBC
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👍 Mine arrived today along with the clouds...
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I'm seriously thinking about getting one of these filters to go with my ASI294MC Pro. I'm trying to find an unbiased review of the filter. Retailers seem to put forward the blurb from the IDAS site. There are clearly sponsored videos on Y-T.
So I'm looking for some unbiased user feedback please.
It states it's designed to use with optics up to a 14° incidence angle so my future 8 inch RASA just scrapes inside that limit.
If anyone has used it with a fast optic your thought would be very helpful.
Cheers
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Great image Tony, This with the 294 and the Tri-band or Quad-band as they have different red pass band widths?
Might be worth imaging without the narrow band combination filters for star colour (+UV/IR Cut) then over lay the starless NB image - just a thought.
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Nice Alan - Certainly can be seen from the UK (just) - my effort on same earlier this year:
Mixed process APP + PI
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I think you need to alter your windows display theme under control panel to set backgrounds and text colours.
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20 minutes ago, FLO said:
No feedback yet.
https://www.nightskydan.com/optolong-l-enhance-filter-review/
or Trevor on Astrobackyard…
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Any feedback on the dual narrow-band with faster f2 systems?
Just found this: https://www.nightskydan.com/optolong-l-enhance-filter-review/
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Superb Olly - a favourite with me any day... 👍
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Nailed it - Brilliant Rodd 👍
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Rodd, Looking at the Iris and walking away and back again (my) thoughts tend to feel that the core is superb the background is great it's the dust to me that feels awkward. The core stands on it's won no problem, but the dust merges with the background and gets lost. Lift the dusty areas a little, and I mean 'a little' so the whole Iris is lifted away from the background...
Francis
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RASA 8 first light image
in Member Equipment Reviews
Posted
Hi Roland - If you'd read the earlier post you'd have seen that the 'teckie' stuff comes later. I've had the rasa a couple of days, there are issues and they will be looked at in due course.