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chiltonstar

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About chiltonstar

  • Rank
    Sub Dwarf
  • Birthday 19/12/45

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  • Gender
    Male
  • Interests
    Wildlife photography + astronomy of course
  • Location
    Wessex/N. Berkshire Downs
  1. Some interesting comments! I've just measured the distance from the back of my Mak to the chip using the flip mirror (16cm) cpd with using a normal diagonal (17cm to the focal point), so for me, there's little in it. Chris
  2. Something worth adding perhaps. My flip mirror takes the camera directly on the rear port, and the centre of the chip then exactly aligns with the crosshairs on the EP, but if I want to add a barlow (just the lens element) or IR filter on the front of the camera, I've had to use the 1 1/4 nosepiece fitting for the camera (which has a screw thread in the front). This slightly off-centres the camera though which is why I've added a shim cut from teflon sheet around the nosepiece so that everything is centred. Chris
  3. Using a 180 Mak with a 2x barlow, I use the SW flip-mirror with illuminated EP. After a bit of fiddling around on the Moon (because the flip mirror and barlow are not exactly centred with the ASI224), I now have the centre crosswires exactly aligned with the planetary image on the laptop screen, or if it's not visible, it is very close to the edge and can be moved into view. Chris
  4. Saturn really showed its true colours tonight (16 degrees elevation) with an almost Hubble like view, razor sharp Cassini and inner ring detail. Best mag was x270 and still sharpish at x400 (180 Mak). The seeing was so good for a brief patch I swung the scope across to Zeta Herculis through a hole in the cloud, - cleanly resolved with a blue pinpoint secondary - probably the best I've seen it yet! Chris
  5. An option Geoff, although I'm not sure I'd get my 180 Mak and SkyTee2 onto a plane.....might work with my little grab 'n go Mak and Porta2 mount I suppose. I like the observing configuration - ready-cooled scope to one hand and warmed rouge to the other......Ah, bliss! Chris
  6. There are fleeting good moments, but personally I think the answer is to pack the car with scope and mount and head off to S. Italy or Spain for a break to gain 15 degrees altitude! Chris
  7. Thanks for this Shane. Is there a big difference in quality between the various BV setups sold? Chris
  8. A general point re BVs but particularly applicable to doubles, do you need correction lenses on each EP to correct for any human eye differences (I don't wear glasses, but I can notice very slight astigmatism between one eye and the other). If you do, does this change the FL of the two EPs slightly and make it difficult to get coincident images for doubles? Chris
  9. I like the "Blu Tak" description, very apt! I am no good at drawing (artistic skills of a carrot, as my art teacher put it) so I've tried to image it on a number of occasions - the best I've done was with my 127 Mak and a Philips webcam (below). This was about two years ago, so the pair would have been slightly closer - with a period around 30 years, you can really see the changes, particularly in PA! Chris
  10. Sometimes, if you dim the view (more mag, ND filter or maybe splitting the beam with a BV) the split looks more obvious as the minimum between the two disks is less obvious. Chris
  11. ...quite a catch with 120 mm aperture, although it's just about split with my 127 Mak as well, which is about 120mm ca.! These are simulations (Aberrator) using the latest WDS data for the pair. Chris
  12. Nice sketches! The split with my 127 Mak looks like John's sketch pretty much: with the 180 Mak, the disks are smaller but the diff ring structure more obvious. Chris
  13. How does Zeta Her look through the 120ED? Always a tricky little devil..... Chris
  14. Hmm - I was enjoying some Bootes doubles as well, although I avoided the shorts as the night before I lost a few litres of blood to the mozzies which seem to have appeared in the last few days...... Chris
  15. They are lovely scopes - I've had my 127 for 6 years and it is a star wrt doubles and planetary views. Nb: I've never needed to collimate mine, despite some rough handling and schoolchildren using it - one of the joys of Maks, flat fields, no collimation and sealed tube. Chris