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About RodAstro

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    Derbyshire UK

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  1. Hi I don't use a filter with the standard scope, no need the objective is to small. I just use a UV/IR when using the removed quark unit on my 6" scope to take the unnecessary load of the first little quark filter so the UV/IR goes before the quark. As the UV/IR filter is a reflection filter and not an absorption filter it will not come to any harm, clear glass absorbs very little heat. For photography no other filter is needed as they just reduce light throughput so increasing exposure time so the wrong way to go. Because everything is moving on the sun you need to keep t
  2. Hi Are you thinking about the standard scope or are you thinking if it is good enough for a larger scope mod?
  3. Hi Roy Does your F16 have a Carton lens I think that's what Skylight use? I have a 76mm F16 with a Carton lens it is superb, just in the middle of restoring the tube then fitting on a Unitron 145 head. I have a set of T circle ortho eyepieces for it but I don't think they will get much use with the CZJ orthos about. People don't realise how good and bright a well made Huygens is, all comes down to the least amount of glass interrupting the beam. Very rare items since Tasco gave them such a bad name. Rod
  4. Yep that is nice will show a lot of colour fringing though but stopped down to 10" f15 or even 8" F18 on planets it would be very nice. The Bayers mount is very nice.
  5. About the Atmospheric dispersion, it is an old trick many planetary observers used and worth trying with Jupiter and Saturn being so low at the moment I have found that many of the cheaper 70 degree eyepieces are ideal for this. All you do is find the centre line of the dispersion then maneuver the planet along this line from the centre of the eyepiece field, one way the dispersion will get worse the other side of centre the dispersion will decrease until it has gone and the planet appears much sharper. You only need a AD unit for photography, although you could probably use the eyepiece
  6. Hi Mark Full set of the original brass Abbe Carl Zeiss Jena Orthos, they are so sharp and flat to the edge you can use the field stop as an occulting bar. Picture of my set here with the bino head and rotating turret and all the fittings for afocal projection and the schott rotating filters. Interestingly for scopes that were to be used in very northerly latitudes Zeiss also supplied a set of paired Huygens eyepieces to be used in the bino head for planetary work as you can use their field curvature as an atmospheric dispersion corrector by placing the planet in the correct part of
  7. Hi Peter that Eling Beck is a lovely mount. A 16" Meade replaced my Zeiss at St Andrews Uni they said the optics are good but the mount has never worked properly so never gets used, it has had numerous boards and has even been back to Meade, Just not in the same league as these professional scopes. We also use some Clave true Plossls that my friend has we can never make a decision between them and the Zeiss orthos both are excellent. I will have to come and visit you sometime I have been meaning to for years.
  8. Yep just like the good old days but a lot easier to do a meridian flip noerdays
  9. Hi Dave Very interesting, no mention of naglers. Yep I love the Zeiss Orthos I have the full set and two of each for the bino head and a 40mm and a 63mm Zeiss huygens that is fantastic. These all came with the telescope and are always my preferred lenses to use, everything is so flat and sharp, I see no reason to have a wider field of view if it is full of distortions. The Zeiss bino head has a 1.5 times correcting barlow that is removable so eye relief is not a major problem with the orthos until you are using the 6mm and 4mm, 843X for the 4mm so not used often. The dilemma I h
  10. Hi all Yep as you say Rusted f15 is a big operation I have a crane stored away for working on mine. Yes it is folded and has the bonus of fixed eyepieces. Orientation is not a big problem, you just let the object drift then you know where you are. As you say Rusted mounts are the biggest problem for large refractors another plus for the folded design is you end up with a correct size mount, not very portable though. The RA axis of my mount is the basis for the 36" Zeiss cassegrain so I have no problem piggy baking other scopes. Out of interest I would like to hear views of
  11. Yep F15 rules Here is a picture of what I own and use day and night over the past 15 years. Mine is one of three that is in private hands, only two are working. The 6" lens is in the class of apochromatics visually and is of steinheil design, flint first. One of the great things of F15 refractors is they have wonderful flat fields and are very tolerant of eye position at the eyepiece, unlike modern short apos, even F8s. This is the public observatory at Brisbane as it shows the size of the scope. The scope was designed to fit a six foot observatory, mine is in a seven foot o
  12. Hi With christmas coming up If anyone feels compelled to get a star named for someone don't go with the scammers (apparently WH Smiths are among these scammers) Go here instead at least your money is going into astronomical research and not some individuals pocket. https://adoptastar.org/?gclid=EAIaIQobChMI6Jb0qKjx7AIVOYBQBh1w8ggzEAAYBCAAEgI4uPD_BwE Apparently you can also choose your star from what is left so you may have a chance to even see it. Cheers all
  13. Hi Not a chance yet it takes so long to set everything up and get aligned the clouds roll in. It's just so much easier to open the observatory and switch on and away we go. It does make me realise why I built the observatory though, so that's a positive. Cheers Rod
  14. Hi Steve The four port externally powered USB3 hub arrived today. So far just plugging in the ZWO ASI174mm USB3 camera works fine and does not seem to drop out. I have the ZWO connected to the hub via its original 3m cable then the hub connected to a 6m repeater cable to the laptop. The hub has four power switches one for each port and the camera only becomes active when the power is on so the laptop power is disconnected from the ZWO. The hub has a 2amp power supply so plenty for the ZWO on its own 3m lead. The data transfer is uninterrupted so the repeater cable takes care of that.
  15. Hi Steve Yep the stacking software cannot run in the daytime as it needs several good star images to align. This can also be a problem at night if you don't capture enough stars. I have tried it on my 10" f6.3 and only get success on globulars because the field is to small to capture enough stars. I use it with a Skywatcher ST102 and it works fine. I am using a Celestron Advanced GT for the mount. I am still waiting for the hub to arrive. Cheers Rod
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