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CraigT82 last won the day on March 5

CraigT82 had the most liked content!

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About CraigT82

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  1. CraigT82

    DIY newt with raspberry pi and camera

    Quite sure! For a given aperture and a given eyepiece (or camera chip in your case) a scope with a shorter focal length (smaller F number) will have a wider field of view. Here is a useful link for determining your field of view with any scope and any camera. you just need to input the specs of each (scope aperture and FL, camera resolution and pixel size). https://astronomy.tools/calculators/field_of_view/ In this image I've loaded two different field of views on Jupiter for a 200mm aperture scope and a Raspberry Pi V2 camera module: Red- 800mm FL (F4) Yellow - 1200mm FL (F6)
  2. CraigT82

    Which Takahashi refractor?

    I think the price differential is due to birding scopes being weatherproof. As they are nitrogen purged they need to be air tight to keep the nitrogen in, which leads inherently to waterproofness. The nitrogen purging is to prevent dewing inside the scope and to inhibit fungus growth. The dry nitrogen replaces the damp air. Nothing to do with the optical characteristics as far as I'm aware
  3. CraigT82

    DIY newt with raspberry pi and camera

    You've got this wrong... for a given aperture - the smaller the F number, the wider the view and vice versa. And generally the F number will have nothing to do with the clarity or sharpness of the image, that's mainly due to the atmospheric conditions but also down to the quality of the figure on the mirror. The brightness of the image is a function of exit pupil and magnification. Mounting a raspberry pi at the focus is an interesting idea, not something I've heard of before. People do talk about mounting a camera at the focus but usually give up on it as it difficult and doesn't really offer any benefits over using a diagonal mirror and mounting a camera conventionally outside the tube.
  4. CraigT82

    Collinder 399

    Beautiful!! The coat hanger is my favourite asterisk and you're really showing it at it's best there... top image
  5. CraigT82

    More Excellent Lunar Viewing

    Good luck with explaining that the north star isn't the brightest star in the sky... again and again and again!
  6. Just need a few tools and A bit of ingenuity... fitted a 2" Crayford to my H130
  7. There is a 14" F4.5 Sumerian with John Nichol mirrors for sale on UKABS now, it's in Reading and on at £2700. (and nowt to do with me - just a heads up!)
  8. CraigT82

    Smartphone Valles Alpes Rille

    Thanks Stu, yes the samsung cameras are great! You can get much better manual control apps with Android too. Thanks John, I've never bothered with a holder, I find just holding it up to the lens is good enough, though can be tricky with tiny exit pupils
  9. GSO mirrors are no slouches, as with Synta they may be mass produced in China or Taiwan but they are not bad at all. Problems you hear about with Chinese mirrors is more to do with QC that manufacturing quality... they tend to let more of the duds through than the specialist high quality Japan/UK/USA manufacturers. Who makes the TS quartz mirrors out of interest?
  10. We've been blessed with some great twighlight seeing the past few days, last eve I was out at about 9pm and observing the Valles Alpes area which was right on the terminator and in a good position to try to pick out the long narrow rille in the valley floor. I could make it out as a faint white line visually, not for the whole length of the valley though, just the northern portion. This line quite 'transient and came and went with short spells of excellent clarity. Attached are a couple of images I shot using a galaxy s8 afaocal (through a barlowed 10mm BCO giving x325). In the enlargement you can just make out the faint white line on the northern valley floor, but only if you squint, stand 6ft away and use your imagination! (Visually it was a bit clearer than this). Also added a picture of craters Aristoteles and Eudoxus, I spent a good while having at the lovely terraced walls and boulder Strewn floors of these two as well.
  11. CraigT82

    More Excellent Lunar Viewing

    Nice and clear here too with steady seeing, managed to view the rille in the floor of the alpine valley as a faint white line, that's a first for me with this scope. Previously I've glimpsed that rille as a dark line in my old 200p f6 (different illumination I guess). Snapped a few pics which I'll post over in the imaging section. No Jupiter for me... in bed now as early start tomorrow!
  12. CraigT82

    More Excellent Lunar Viewing

    Can I ask which Lunar Atlas it is you have there? I'm in the market for one... fed up with the rubbish selection of lunar maps available for android phones!
  13. Not sure you'd need at Paracorr at F6 would you??
  14. CraigT82

    More Excellent Lunar Viewing

    I had a really good look at Posidonius last night too. I even attempted to sketch it but my attempt was dire and I reverted to snapping pics with my phone at the EP. What really stood out for me was the 4 small peaks in a roughly semi-circular arrangement close to Posidonius A (on it's right in the attached pic in the OP). I was observing from about 7.30pm in daylight and the seeing was decent, when I went back out at about 9pm it had gone all mushy.
  15. Has been fairly good seeing this evening so snapped a few shots using my Samsung galaxy s8 through Fullerscopes 8.75" f7.5 newt. EP is a 7.7mm abbe ortho giving x210, then a barlowed 10mm ortho giving x320 (The first one has been cropped a bit harder)

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