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Posts posted by Xsubmariner

  1. 17 minutes ago, Simon Pepper said:

    Thanks Nikolas. Perhaps I look at the 071 instead.

    Hi Simon the ZWO-071 is an APS-C size sensor with a pixel size of 4.78u, coupled with the Redcat 51 it will give you an image scale of 3.9 arc/sec per pixel. I have found an image scale of 1-2 arc/sec per pixel better suits U.K. skies. 


    1 hour ago, teoria_del_big_bang said:

    Wow is that the 1600 next to it in the first pic ?   It looks tiny next to the new camera and filter wheel.

    Yes it is, as the pictures show the QHY camera and FW are substantially larger than the ZWO equipment.

    • Like 1
  3. Hi Guys the much waited for QHY268M has arrived along with CFW3M (7x36mm) and OAGM. The camera looks great and comes with the largest set of adapters I ever received with any camera. 

    It felt strange bolting the camera direct to the FW, but was much appreciated given the limited back focus I have with several Flatteners and Reducers. Within the kit 2 layout cards are included that show how to use the adapters to achieve a back focus of 55mm, with either CFW3M or CFW3L and with or without the OAGM.  I am relieved to see QHY have provided “real world” adapters with their camera that will allow most new owners to start using it straight out of the box.

    Having the camera secured to the FW will not be a problem for me as I have rotators fitted to most of my imaging equipment, though I can see it not being ideal for everyone. Cleaning the camera widow if dust settles will not be quick, given the FW has to be opened and carousel removed to gain access.  Should one experience dew on the camera window, I noticed a channel in the camera body to allow air to be blown in and a rubber bung fills the hole, when not in use.  I hope this information is of some benefit, now for some clear sky please.






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  4. Hi Neil,

    I don’t believe you can go wrong with the Mesu MK2, it is definitely a mount that does what it says, unlike some other mounts I have tried.  Your camera choice is interesting, while I have a mix of Cmos and CCD camera’s (QHY, ZWO & SX) my last three additions are all IMX455/571 sensor based units. These sensors offer considerable improvement over the older Cmos sensors and are worthy of some investigation.

    • Like 1
  5.  I suspect the 268M will come with the same spacer kit as the 268C, which is also identical to the 600L. While hoping to get the 268M next week, it’s unlikely I will get any imaging done as the sky here looks dismal for a week or so.

    The 268C doesn’t come with a tilt plate, it has a dovetail coupling to enable the camera to be rotated. I don’t like it much as it’s possible to off-centre the camera. Once I have the camera centred I only loosen one screw to rotate or remove the camera. I am thinking of using locktight on the other 2 screws.

    • Like 1
  6. Hi Neil,

    Welcome to SGL. It is a good time to get into AP, weather aside. Today there is a lot of choice with; cameras, optical equipment, mounts, capture and processing software. In fact so much choice that the first major challenge is determining what components support your individual needs. 

    This forum will provide access to a lot of knowledgeable people who will be able to support you in your first steps and beyond. Enjoy the journey.

  7. Stuart1971 “The Pegasus one is very good, so I have heard, but it’s wwwaaaayyyyy overpriced, as all the Pegasus kit is...”

    A review of rotators that are available today shows the Pegasus falcon is reasonably priced. Any commercial rotator has to be a precision instrument to support the necessary accuracy and strength criteria associated with the Astro imaging demands. Ultimately any failings in these areas will degrade the final image.

    Currently in the process of fitting a falcon rotator in my imaging system, thinking about rip offs in this community what about threaded adapters. I had to pay £145.79 for 4 x treaded adapters to fit the rotator, that’s a rip off. 

  8. Hi Desmond,

    I also have the L-Extreme filter and from my experience believe it is excellent for imaging with a colour camera when there is moon present (light noise swamps signal). I would definitely increase your exposure time when using the filter, remember you are effectively conducting narrow band imaging with a colour camera. Here is an image taken with my QHY163C with L-E filter on a 75% moon night. It is the combination of only 13 x 10 min exposures taken when clouds allowed.  Remember that your mount/guiding limitations will have to be adhered to, no point having more signal if your stars are bloated or misshapen due to poor guiding. 


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  9. There is a Dedicated  ZWO camera heater available that sticks to the camera faceplate and comes with a power splitter cable.  Wether to fit one or not depends on your environment and camera setup. Unless you are experiencing freezing moisture on your camera window I wouldn’t bother. I doubt ZWO would sell the camera dew heater that’s available if there was the possibility of damage to the camera.  If you are using a portable power arrangement it may be better to reduce the cooled temperature to -10 than add another power drain. 

  10. Hi Glen

    A good video and great budget observatory, you must be pleased with the final outcome. May I ask if there was anything you would have done differently now that you have had time operating the system. Additionally have you fitted or considered environmental control to protect the equipment. I noticed you lined the inside with some form of insulation and how did you attach it?


  11. New camera purchase necessitate I sell some equipment to balance my account. For sale is a great colour camera with a good reputation for imaging. The specs  below show the quality of this camera, it is the model before the Trius, so doesn’t have the integrated USB hub. Otherwise its the same performance with regulated cooling, a search on this forum will show the capability of this camera. It’s size is also ideal for Hyperstar, RASA scopes.



    CCD type: Sony ICX453AQ SuperHAD CCD with ultra low dark current, Bayer RGB matrix and vertical anti-blooming.

    CCD Full resolution Pixel data: Pixel size: 7.8uM x 7.8uM, Image format: 3024 x 2016 pixels

    CCD Image area: 23.4mm (Horizontal) x 15.6mm (Vertical).

    CCD quality: Grade 1 or better - No bad columns, no dead pixels, no more than 50 'hot' pixels (saturated in <10 seconds).

    Spectral Response: QE max at 540nM (~60%), 50% roll-off at 400nM and 650nM. 

    Readout Noise: Less than 12 electrons RMS - typically ONLY 7 electrons! 

    Full-well capacity: Greater than 25,000 e- (unbinned)

    Anti-blooming: Overload margin greater than 800x.

    Dark current: Dark frame saturation time greater than 100 hours. Less than 0.02 electrons/second @ + 10C ambient.

    Data format: 16 bits.

    System gain:  0.4 electrons per ADU

    Computer Interface: Built-in USB 2.0 compatible interface. Also works with USB 1.1.

    Image download time: Typically 3.5 seconds full resolution using USB 2.0, approximately 8 seconds with USB 1.1.

    Power requirements: 115VAC / 240VAC @ 12VA, or 12VDC @ 750mA max.

    Cooling system: Regulated constant current cooling supply with single stage thermoelectric cooler to give a CCD temperature of approximately -30C below ambient.

    Size: 75 x 100mm black anodised aluminium barrel with 42mm 'T2' thread at the CCD window end & input/output plugs at rear. CCD alignment screws are provided for setting the chip parallel to the focal plane.

    Weight: approx. 400g.





  12. I would be careful about purchasing old copies of PS on eBay. Many are unlikely to be legitimate. Even if you are successful at acquiring a genuine copy you will struggle to get it registered with PS, if at all. Look on the PS forum to see the many cases where genuine original purchasers are struggling. 

  13.   One of the most frustrating aspects of taking up amateur Astrophotography is the ever growing size of my adapter collection which is necessary to construct and rebuild imaging systems within the backspace constraint of the hardware for a given target.

    Only yesterday I stopped an order for an M68x1 female to M54x0.75 male adapter at the point of purchase. While the €75 cost was a bitter pill, the €45 international postage for such a small item was beyond believe. With a total cost of €120 I backed out. You might expect the item to be coming from New Zealand but no, just Germany.

    At the same time I am seeking a couple of M54x0.75 male to M54x0.75 male adapters for my other system upgrade to include a rotator. So far I have purchased the last adapter on Aliexpress and have found a limited source in the USA, who won’t support international post.

    At times I question why I am bothering and wouldn’t it be easier to book online slots with a remote site. That said, for me it is as much the mental and engineering aspects of this hobby that I love. Online imaging is not for me and I am sure there are many others who defy logic and build expensive imaging systems in the UK where one can expect at most, a couple of dozen quality imaging nights a year.

    These recent experiences raise a few questions I believe are worth some discussion among fellow imagers.

    Should manufacturers of key imaging equipment be expected to provide more adapters with their core products; reducers/flattener, rotator, filter-wheel and cameras?

    Why am I unable to find a U.K. source for many of these relatively standard adapters?

    There is an option for custom made adapters From Precise Parts in the USA, but import taxes make this choice prohibitive for many. Why isn’t there a U.K. equivalent service, likely not cheap but affordable?

    I am sure there are many who have purchased their new pride and joy equipment, only to find there is a lengthy delay with using it while seeking elusive adapters, any thoughts?


  14. Great to hear you have your new Mesu, you will not regret it. I haven’t bothered with PA drift aligning, T-Point/SiTech  sky point-map and PEC is not necessary. I find my Mesu’s provide ease of imaging equipment swap outs that don’t need me to expend valuable clear sky (so few in U.K.) time to calibrate the system.

    I use SGP for sequence control and just complete a manual platesolve which sync’s the mount on startup. Following a sequence commanded slew to target, both mounts centre to within 2 pixels, usually within two plate-solve iterations. This level of goto performance is then repeated on other targets in the schedule for the rest of the night. While guiding performance is affected by the seeing, I generally get 0.2-0.3 arcsec guiding accuracy with good seeing.

    If you plan to operate your mount in the same fashion above, there is minimal interaction with the SiTech controller beyond the initial setup. Good luck with your first light. 

  15. Thanks, I have just tried mine for the first time and was using gain 26 offset 30 so fairly close. These new cameras have introduced another layer of complexity for dedicated imagers to experiment with, shame we don’t get the clear skies needed to experiment effectively without loosing image production. It would be handy if the guidance was better.

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