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NenoVento

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About NenoVento

  • Rank
    Nebula

Profile Information

  • Interests
    Many and an amateur in all of them.
  • Location
    Tenerife
  1. It definitely moves but at 243 days one rotation maybe it is just the clouds what do. Excellent picture, I'm rather envious . NV
  2. That is a nice shot @Ibbo!! I've got a wratten #47 (violet) ready for my next session. I haven't found an IR-Cut filter yet, but I will try to use an UV/IR Cut one that I have around. Wish me luck!. NV
  3. Thanks @willcastle and @Pete Presland. Hopefully I'll get a few more chances before March.
  4. What an arsenal you have got!. I'd suggest to increase the gain as much as possible before giving up with the barlow... Good luck, I'll be looking forwards to see your results. NV
  5. Hi @Ibbo!. It must have been really frustrating I rekon. To help with the focus issue, I've thought about getting one of those feather touch focusers, but in the end I decided for a motorised one which, according to the tracking system, is in its way already .
  6. Hi all, Since I don't seem to find the time for going at a higher altitude for capturing Venus, yesterday I tried again from home (located at sea level), this time with the idea of testing a couple of things, such as to use the blue filter (which is the closer thing I've got to an UV-pass). I started setting up my gear a bit too late, with the planet already past its transit (which was at 15:48), the seeing was of about 1" and there was a bit of wind (15 knots) and some Saharan haze in the atmosphere (locally known as calima): I apologize for not having the tags in the above picture in English. I made the composition in the gimp when I finished processing the videos, in order to send it to family and friends (you know ho it is like), but forgot to save the file for making an English version as well. Anyhow, I believe it is quite easy to understand: "filtro" is the Spanish word for filter, and the other non English (or made up) words are "Azul" (blue) and "PolVar" for the variable polarizing filter. The gear: Celestron CPC 800 GPS XLT ZWO manual filter wheel ZWO blue filter ZWO IR 850nm Pass filter Solomark variable polarizing filter GSO 1.25" 2.5x Apochromatic Barlow Lens Risingcam GPCMOSS02000KMA (mono camera) Risingcam GPCMOS-1200KPC (colour camera) The software: ToupSky I made two minute movies with the following setups: Venus blue filter: 19.19 & 0.3ms Venus IR-pass filter: 33.87 & 0.8ms Venus no filter: 4.31 & 0.3ms Venus variable polarizing filter as closed as possible: 20.64 & 2.0 ms Uranus no filter: 31.39 & 99.292 ms Autostakkert RegiStax Fitswork The Gimp As you can see, I didn't get the elusive clouds (although there may be a hint of them in the no-filter picture). Honestly It is very tricky to get a proper focus without the aid of a bahtinov mask. Also, I need to remind myself to check the collimation of my telescope... Later that night I made my first session using Celestron's CPWI and my gotos got so accurate that I made my first ever picture of Uranus, which you can see at the bottom left of the above image, this time using the colour camara (which I also used for aligning the scope!). Best regards, NV
  7. Thanks for your comments @vlaiv . The #38A dark blue filter does look interesting and quite afordable, but if you add its cost together with the ZWB1 and the adapters, the high risk of failure for this experiment makes it too expensive, at least for me. Best regards, NV PS: If I am not mistaken, the cost of these photometric filters are slightly cheaper than the IDAS UV-Pass filter.
  8. Hi @Thalestris24 (Louise). I agree with your assesment on this issue and won't pursue it any further. Thanks a million! . NV
  9. Thanks @Thalestris24 (Louise) for your comments, yes, 380nm is very close to the visible spectrum (400-700 nm) and also the filter seems to have an IR window (that reach to about 30%) overlapping the 700 nm zone... I guess that it won't probably work with Venus, or at least not in the way that the baader and the rest do. However, since you have one of them, maybe you could give it a go . Although the ZWB filters are indeed cheap, in my case, since I have to get two adapters (at least for the M49 one, I haven't found an M42 one), their added costs makes this a rather pricey experiment for me to pursue right now, really... Best regards, NV
  10. Hi all, As you know, baader, astrodon and idas UV-pass filters, which are the ones used for imaginh Venus' clouds, are quite expensive. However, by searching on the Inertnet for similar (at least by name) kind of filters, I came across with a possible alternative: https://es.aliexpress.com/item/32969203564.html According to the provided transmitance graph, the filter seems to reduce visible light considerably, while leaving UV and some IR to pass: Honestly, being so cheap, I'm really tempted to try one. Unfortunately, they don't have an M28.5 version that I can directly thread to my cameras or to my 1,25" filter wheel so, in order to find a way to use it, and assuming that being advertised as a 48mm filter it will be able to slide inside a 2" barrel, purchasing the adapters that my scope requires (which, if I am not mistaken, are a SCT female to 2" and a M49 female to M48 male so as to thread the filter into my 2" barlow) will increase the overall costs considerably, reaching to about 26 GBP for the whole set. What do you think?. Regards, NV
  11. Mmmm... I tweak the exposure and gain for each channel until I get a more or less similar histogram for them all, otherwise I get almost no signal in the blue one. NV
  12. I've come across with info recomending the 642 nm for SCT of 8" and smaller, and the 807 nm for 10" and bigger, I suppose due to the heavy light filtering that they do. However, you are using an 80ED so maybe the 642 nm is a better option, which you will probably get to notice if you use a barlow, for instance. NV
  13. Beautiful pictures, indeed. Here in the Canary Islands we get this everytime there is a calima (a kind of dust haze that comes from the Sahara desert), but usually you notice it more around The Sun. Maybe you are getting some of this dust up there as well. NV
  14. Hi all, Me again, with my lastest attempt on Venus taken from my terrace. I believe that, in my quest for getting something new out of the data, I might have overprocessed it. Please, let me know what you think: The gear: Celestron CPC 800 GPS XLT ZWO IR 850nm Pass filter GSO 1.25" 2.5x Apochromatic Barlow Lens Risingcam GPCMOSS02000KMA The software: ToupSky Autostakkert Fitswork The Gimp I took 20 videos of 2 minutes each and stacked them one by one, then I corrected the colour levels for all the resulting images with Fitswork and re-stacked them once again to get a final image. Then I used Fitswork again for heavily filtering the existing wavelet noise (here is when the "clouds" came up) and, finally, The Gimp for correcting the colour levels and export the results to jpg. Quite a lot of work, to be honest... My next try (if I get a new one before March, that is) I'll go up the mountain to try to capture the videos with less Earth atmosphere in between. Regards, NV
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