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johnfosteruk

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johnfosteruk last won the day on July 30 2023

johnfosteruk had the most liked content!

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  • Gender
    Male
  • Interests
    Astronomy, obviously.
  • Location
    Plymouth, UK

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  1. A very appealing scene this evening. Oh, and a handful of stars in Cetus. One frame, shot at 150mm with the Tamron 150-600 on a Nikon D7100. 1s exposure, F5, ISO 1000. Just a little fettling in photoshop to adjust contrast.
  2. He didn't kick start anything for me, but It was his purchase, and subsequent review of the Lacerta Herschel wedge that led me to purchase the same and start taking the solar business more seriously. There must be so many SGL members with a similar debt of gratitude.
  3. Very sad news indeed. John was an influential and knowledgable member of SGL. As others have said I did wonder why he'd not posted for some time. RIP John.
  4. Funny you should say that, I was going to mention the 135mm M42 SMC Super Takumar F3.5. It can be adjusted to focus to infinity, fairly easily and is a good little performer for astro. A lot cheaper than a Nikon too.
  5. I was going to say it depends on whether you want something long or something wide. Which is why I'm now possibly going to second the 16-300 suggestion as it covers both ends. Never used it myself tho so can't speak for IQ, AF speed etc although DPReview say good things, although they say corner sharpness and AF reliability suffers at the long end (worth looking at other reviews though as that may not be the case on every unit). They also say there's CA and distortion in spades but Photoshop etc can sort that if you have it. If you're wanting it for Astro work though, all of that will cause you problems.
  6. That's nice. I downloaded the Stephan's Quintet data last night - nice big files aren't they. I'll be having a play with them tonight.
  7. Been waiting for this, cheers Dave.
  8. You can still register - just use N/A for those fields.
  9. Here's a lot more detail on the NIRCam filters: https://jwst-docs.stsci.edu/jwst-near-infrared-camera/nircam-instrumentation/nircam-filters
  10. As others have said, just in this release there's so much to enjoy. Looking forward to regular releases. And don't forget you can access the data yourself via MAST, as described here: https://archive.stsci.edu/contents/newsletters/july-2022/accessing-jwst-science-data-after-the-end-of-commissioning?filterPage=news&filterName=news-filter
  11. Yes, me too, it'll be great to see some of that stuff confirmed, and new things too.
  12. Very nice, here's a rough approximation of the strut/secondary layout someone 'knocked up' and resultant Fourier transform that I found 6 years ago just for interest. Not far off the final result.
  13. Let's not forget another area Webb will be contributing to - exoplanets.
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