Jump to content

SkySurveyBanner.jpg.21855908fce40597655603b6c9af720d.jpg

alacant

Members
  • Posts

    6,137
  • Joined

  • Last visited

  • Days Won

    4

alacant last won the day on April 27 2022

alacant had the most liked content!

Reputation

6,311 Excellent

Profile Information

  • Location
    Alicante

Recent Profile Visitors

9,062 profile views
  1. No, no. You must not do that. Chalk makes dust which could get onto your lens. Otherwise, good advice😉
  2. Hi In Spain, maybe call Luis at str-astrum who may be more knowledgeable as to your climatic conditions. FWIW, for cooled CMOS here in Alicante, we've standardised on -5º all year round. In summer it's not easy maintaining much below -10º anyway and the benefit it brings is negligible. HTH
  3. Hi I don't think a change of glass will make much difference, but a triplet may. Ideas. Use a: focus mask to get you close to focus, then remove it. Use live view to move away from that focus point until the blue halo is reduced. reflector #8 and correct the colour cast afterwards Or just mask and reduce it:
  4. Hi Siril flips the images. Is there any reason for not using Siril to process your cr2s from start to finish? Siril's banding algorithm is best applied after pre processing the fit sequence. You need only a flat frame stack which has had the offset subtracted. Details here. You are free of course to flip back or choose any orientation you like. Probably easier though to do it after processing. HTH
  5. Hi everyone First night for ages I had a telescope to myself. In fact two. Cheepo specials; a gso203 and a Bresser 203. m106, ngc2903, m63 and m66, changing to the gso after 106. Forgot to take flat frames, so had to guess the camera angle for the Bresser. Hopeless. The only way out was graX's AI, which I really don't like. Ironically, I think it has the best background. Thanks for looking.
  6. Hi Some stuff is difficult or impossible to describe in words on a forum. The in person person is at your local astro club. Any of the members would be only too willing to get you polar aligned and imaging. Probably in less than 5 minutes! Cheers
  7. To reseat the front element, simply loosen its retaining ring until upon shaking the lens, you can hear it rattle. Now tighten the ring until the rattle just disappears. That should help with the astigmatism/gulls/birds. ISO800 is the optimum setting for low noise on the 18mp sensor.
  8. As per our 700d -same sensor- and an old Takumar 135... Did you try the ISO800 5s f8 no drizzle idea? You might also try loosening and reseating the front lens element. Cheers
  9. People seem obsessed with it. I image. To me, it's useless. Where I live, I can see the milky way. But if there's a moon, haze or I've been looking at my 'phone, I can't. I don't need a number to associate with these observations. But... Is it a 'good' night if I can see the milky way? No idea until I've assessed the seeing. If it's poor, no amount of Bortle is going to change it. Cheers and clear skies.
  10. It gives you a circular aperture, helping control aberrations around stars, particularly those caused by the non circular edge of the lens diaphragm.
  11. Hi No need to cut the spring. Simply remove it. That should give you the distance you need. To help you with the secondary, replace the hexagonal grub screw adjusters with M4 hex head bolts; much easier to take up the slack that way. HTH
  12. Hi Still a little overdone perhaps. eos600d? So as a starting point maybe try: RAW, ISO800, 5s, f8, no drizzle; leave the aperture wide open and place a M6 washer over the front of the lens. Cheers and HTH
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue. By using this site, you agree to our Terms of Use.