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Posts posted by fireballxl5
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I have the StellaLyra RC6 and use a flattener, the TSRCFlat2, with my ASI533MC.
50 minutes ago, Clarkey said:You shouldn't need a reducer / flattener - the RCs have a pretty flat field.
This may be widely believed but is certainly not true with the RC6. I thought the same but had to crop my earlier APS-C shots without the flattener. FLO told me that the limit with the RC6 was a 4/3 sensor and so the ZWO1600 may be ok without flattening, but I've seen poor corner stars with the 1" 533 on AstroBin, hence why I leave it in place with mine.
Also, I no longer BIN2 but image at BIN1 nowadays, as this seems to give better final images.
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Thanks for the heads-up on this SN @Littleguy80
So, early this morning I still had motivation to image this brightening supernova and I'd estimate a brightness of mag 12 at the time of my imaging run (between 1:30-2:45).
15x300s (1.25h) OSC BIN1 subs with IDAS D2 LP filter on the RC6. Captured using ASIair-Pro, processed in PI.
CS, Andy
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With the presence of Moon increasing over the next couple of weeks I thought that I would try for one more galaxy last Friday evening (8th April) and so here is NGC3628, the Hamburger.
A little short of exposure time (only 4 hours) but it seems that I have caught a couple of QSOs in this image, possibly including SDSS J112018.38+132620.0 @ RA170.076612, DEC 13.438880; Type: QX; Rmag 19.31; Bmag 20.27; z=3.82 (approx 12B ly away!!!), but this may be an adjacent star? This determination is from the AnnotateImage script within PI using the Million Quasars (Milliquas) catalogue. The script does identify the object in my image precisely (to the pixel) though I am not wholly convinced as there is a dim star also in the vicinity in the corresponding Simbad image. Does anyone know this QSO neighbourhood or if the AnnotateImage script within PI is accurate and can be relied upon?
CS, Andy
Scope: StellaLyra 6" f/9 RC
Camera: ASI533MCPro
Filter: IDAS D2
Mount: RST135E
Guidecam: ASI462MC
Subs: 48x300s (4 hours)
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13 hours ago, Elp said:
I've got a lower power lithium LT which powers pretty much exactly the same as yours fine via the 12v out only, everything else runs from the asiair (pro).
Steve, same here but using a 12V 16Ah LiFePO4 Tracer battery. ASI071MCP, ASI462MC and GTi all powered through the Airpro, powered by the battery. Works a treat for my needs.
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4 hours ago, Vulisha said:
I do have OVL FF for APO, would that be theoretically usable?
I don't know though I see that TS offer dedicated flatteners for both refractors and RC's, implying that they are different designs. I have only used the TSRCFlat2, https://www.teleskop-express.de/shop/product_info.php/language/en/info/p4006_TS-Optics-RC-1-0x-Flattener-Bildfeldkorrektor-fuer-Ritchey-Chretien---2--Anschluss.html
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11 hours ago, Vulisha said:
so I see, too big of a second mirror and it would be like f10 and there would be vignetting on full frame ir even aps c.
Your comment here seems to be regarding the suitability of using a hypothetical 5" RC with a larger sensor. From my experience with the 6" RC, this needs a flattener even for an APS-C sensor. I also considered a full-frame flattener but this was impractical for some reason now forgotten.
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Same need here, 533MC + two filters, LP and NBZ so will follow. Good luck!
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I've only been using my RC6 for a couple of months but I did start imaging with an OAG. This was with an APS-C camera and so the guider star shapes were very poor even with 'sacrificing' some of the sensor area to allow the diagonal to be positioned closer to the optical axis of the scope. Use of a flattener wasn't much help as although it allowed fuller use of the sensor, star quality still wasn't great further out of the image circle.
I've now moved on to use of a 70mm guide scope, actually an f/4 finder. Much easier and reliable guiding based on the single opportunity last weekend.
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I've been imaging with the StellaLyra f/9 RC6 this year and I do like it, mainly as it allows hi-res imaging in a easily transportable package. Natively it does *not* cover an ASP-C sensor though. I've recently got hold of the TS flattener but not had much opportunity to try it out properly, however it does seem to work well. In any case I've also got hold of a smaller sensor, ASI533, that better matches my target imaging resolution and covers many of my preferred targets. I have the benefit of a fixed rig for wider fields. I'll likely be trying the 533 without the flattener as well.
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1 hour ago, tomato said:
Great detail and colour, I have never thought to use the OSC and NBZ on this target, but M1 would be quite small in my FOV.
Thanks🙂 Yes, my fixed rig has an image scale of 1.7"/pixel, this mobile setup is too much at only 0.7 but great for PNs and galaxies🙂
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My image of M1 captured over the recent period of clear weather around the time of the bright Moon (16th-20th Jan) using my RC6 scope, OSC camera and a dual-band filter. Approx 5 hours of data.
Scope: StellaLyra 6" f/9 RC
Camera: ASI071MCPro
Filter: IDAS NBZ
Mount: RST135E
Guidecam: ASI462MC
Subs: 59x300s
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Yes, I like the colours in this very much and good detail. I shot the same target with my RC6 though using OSC with dual-band filter so a different colour combination.
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Second image from my StellaLyra 6" f/9 Ritchey-Chrétien Telescope, capturing NGC2359 Thor's Helmet or the Duck Nebula down in Canis Major. More info on Wiki...NGC 2359 - Wikipedia
52 useable subs captured over 3 nights last week though this time I used a dual-band filter (IDAS NBZ) with the OSC camera to capture the Hydrogen Alpha and Oxygen emission lines as the bright Moon was about. NGC2359 transits at only 23 degrees above the horizon here and so I have around 2 hours to catch it between the local roof & tree lines. I'd like more time to improve signal levels but this seems reasonable for just 4.5 hours.
Scope: StellaLyra 6" f/9 RC
Camera: ASI071MCPro
Filter: IDAS NBZ
Mount: RST135E
Guidecam: ASI462MC
Subs: 52x300s
CS, Andy
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3 hours ago, Len1257 said:
I would be over the moon (!) if that was my first image from a new scope.
Thanks @Len1257🙂
3 hours ago, Len1257 said:I did notice the extra diffraction spikes around the bright stars? Are they caused by the scope design like the edges of the primary mirror in a Newtonian?
I'm not expert but I think they show that the edges of the field are out of focus when compared with the centre of the field (where focus was set). This is the main reason for the need of a flattener when using an APS-C sized sensor. In fact FLO have confirmed that a fours thirds sensor is best suited for use with the RC6.
Here's a crop of the target that I feel makes the most out of the image.
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2 hours ago, iantaylor2uk said:
There's some discussion of flatteners that work for these telescopes at: https://www.cloudynights.com/topic/560592-rc-field-flattener/
Thanks @iantaylor2uk, useful read.
After reading one user note that their '6" RC + APS sensor looked absolutely awful without some kind of corrective optics' it makes me appreciate how satisfied I am with this first light image! 🙃
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1 hour ago, iantaylor2uk said:
You can adjust the tilt on the 071 MC Pro camera if you need to.
Yes that's true but I use the camera with other scopes and lenses so would prefer not to 🙃
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11 hours ago, geeklee said:
Great first light Andy. Very nice star field and plenty of detail in the Bubble. I haven't dusted off my RC6 yet for this year.
Thanks🙂
I've mentioned the suspected tilt but I'm also unhappy with the star shapes. Guiding wasn't consistent owing to intermittent cloud and very elongated stars in the OAG, with the guide star being lost many times.
I'm now wondering which upgrades are standard or needed with your typical RC6 when imaging with an ASP-C sensor🤔
Focuser, tilt plate, flattener?
Any advice appreciated,.
CS, Andy
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9 minutes ago, UKDiver said:
Won't that find 11C 101C etc?
no, but DIR *1*C*.* would
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DIR *1C*.*
At the command prompt should do it.
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Here's the first light image from my Christmas present, a StellaLyra 6" f/9 Ritchey-Chrétien Telescope, capturing NGC7635 the Bubble nebula in Cassiopeia. More info on Wiki...https://en.wikipedia.org/wiki/NGC_7635
Subs captured over New Year's Day (4 off) and 5th Jan (remaining 58). Setup needs tweaking as there seems to be some tilt causing elongation of stars in the far left of the field (largely cropped out here) and stars are OOF away from the centre. Hopefully I don't need a flattener but this also needs investigating. I think that this also impacted guiding as stars in the field of the OAG were particularly poor. Seeing didn't seem to be so great on either night and this will also be a factor. Maybe I should just stick to using refractors lol, but this combo provides an image scale of 0.71"/pix in a light-weight package that I can pick-up and move in and out of the house with ease. It should be usable for smaller galaxy and PN imaging, so worth persevering with.
Scope: StellaLyra 6" f/9 RC
Camera: ASI071MCPro
Filter: IDAS D2
Mount: RST135E
Guidecam: ASI462MC
Subs: 62x180s
CS, Andy
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9 hours ago, Padraic M said:
I've just cloned the original Win 10 installation from the 128GB eMMC drive to the new NVMe drive
could I ask which cloning sw you used to do this? I have a NVMe M.2 that I would like to make my primary Win drive...
CS, Andy
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also I wouldn't do a star test using one at low elevation tbh
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15 hours ago, Chris Willocks said:
Do you think Baader Optical Wonder Fluid would be okay to use on the FSQ-85? I've read good things about it.
This is what I've used on my FSQ85 and also TOA, just once or twice in 8 years now. It seems to work very well.
Flatteners / Reducers for RC6
in Discussions - Scopes / Whole setups
Posted
Yes, FLO also confirmed this but I already had the RC6. Love the scope btw