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About timwetherell

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    Star Forming

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  1. Trying to compensate for something

    Interesting thing to contemplate! 266x minimum useful magnification so one would need an 120mm EP. I guess if you have a naval gun breach as an eyepiece holder you can laugh at 2" EPs so the 46mm field stop's right out the window. I saw a Zeiss EP once that was a 100mm fl and about 5" diameter - so supposing FoV is about 60° one would be looking at about 1/3° of space. Not exactly a comet hunter I'll grant you but probably OK for some purposes. I did look through the Lick 36" with a 55mm plossl but it was Jupiter so the narrow field wasn't an issue.
  2. Trying to compensate for something

    Big scopes are very impressive but as others have said, it's the minimum magnification that kills you. Gotta get a light beam 1200mm wide into a hole in a monkey's eyeball 6mm wide. In the UK 200x is going to be over the seeing limit 90% of the time. But looking at a small dim object like the ring nebula under a pristine sky, a scope like that would give one an unforgettable view!
  3. Another man made "star".

    This is the problem of relatively inexpensive cube sats. The odd one doesn't matter so much but you can see how this will end. Every rich daddy will want a "happy birthday princess" light in the sky and it will be ablaze with light polluting junk. Not to mention the hazard all this orbiting shrapnel creates for legitimate space flight.
  4. Places to visit - Astronomy related

    Herschel's house, now a Museum in Bath is awesome! It's a bit hard to find but once you do, well worth it.
  5. Which eyepiece do you REALLY use most?

    With the recent weather here, I'd think myself lucky to be able to use any eyepiece at all! But with a fabulous clear night last Thursday it was once again the 31 Nagler. Though my stats on this are all based on my deep sky observations, planets are a very different story. But since the Aussies have kidnapped Jupiter and Saturn, deep sky is what's on the menu for a while
  6. Baader 2" 7nm narrowband H-alpha filter in "as new" condition in original box. Asking £140 including UK postage
  7. H alpha vs white light

    I do a bit of both. Interesting to compare the views of sunspots in different scopes - I guess one is looking at the photoshphere in one and chromosphere in the other with many km between. One thing I've noticed is that the "umbra" of sunspots appears smaller in Halpha than white light. I've tried to confirm this using a graticule eyepiece and though the error bars are quite big, does seem to be a real phenomena This is a sketch of a very nice sunspot group visible yesterday (and presumably today too)
  8. Is the UK getting more cloudy?

    Hi Mark, do you happen to have anymore data covering the first half of 2017? I've perceived it as terrible but would be interested to see objective data
  9. Show me your eyepiece cases

    Victorian aesthetic of course! But practical too. The fold down box sides provide space for temporary storage of eyepieces and filters as they're being swapped in and out of the telescope. The 1.25" tray is removable and underneath are a few more bits and pieces that get used far less often. I used to keep eyepieces in the telescope pier but once the pier was permanently outside in my observatory I found they were getting dusty so decided to make a traditional eyepiece case. Now they can all be kept inside but be taken out when needed either in the obys or with my portable scope
  10. Which eyepiece do you REALLY use most?

    Yes we in cloudy old England can only look with envy at the pristine skies across the pond Western UK seems particularly bad I guess because of the prevailing winds across the Atlantic?
  11. Which eyepiece do you REALLY use most?

    Mmmm, I know just how you feel! In the South West we've haven't really had one good moonless, cloudless night all summer And I fear this is becoming the new "normal" Looking back over my 1977 notebooks I was observing on 27/8/77 28/9/77 3/9/77 4/9/77 5/9/77 7/9/77 11/9/77 ... well you get the picture.
  12. Which eyepiece do you REALLY use most?

    I have a 7" refractor, 31 Nagler gives me about 40x magnification and 2° true field.
  13. Which eyepiece do you REALLY use most?

    Yup, that's exactly what I found myself doing all the time when I had the very similar focal lengths!
  14. Which eyepiece do you REALLY use most?

    Yes, I like the narrower view classic EPs on the moon and planets too. Tend to use orthoscopics with as much magnification as conditions will allow. To that end, having a full set with incremental changes in focal length seems more justifiable than it did with the wide angle green print ones which get used mostly for deep sky