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Geoff Barnes

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    235
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About Geoff Barnes

  • Rank
    Star Forming

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  • Location
    From Southampton, now Melbourne Australia
  1. Geoff Barnes

    Optolong Filter

    I quite agree! 32 mm plossl due to arrive any day!
  2. Geoff Barnes

    Optolong Filter

    To be honest when I'm using the zoom I'm not concentrating on the FL much at all, I'm really just adjusting to whatever view I find best on any particular target. Quite often I find that I prefer the 24mm setting, especially for nebulas, which allows me to fit all of the target in the FOV rather than just a portion of it.
  3. Geoff Barnes

    Quick Session with the moon.. xD

    Jeepers, the first and last ones are incredibly sharp! Nice work!
  4. Geoff Barnes

    Moon Filters for Visual Observation ?

    Yes Stu, I have the same disparity with my eyes too, things are brighter through my right eye than my left. When I was out looking at the Alpine Valley the other night I was using quite high power and it didn't seem too bright with my left viewing eye. However, as soon as I looked away from the eyepiece I found I couldn't see anything through my left eye for quite a few minutes . I don't have a moon filter but I may well get one now.
  5. Geoff Barnes

    Optolong Filter

    I can just about survive the heat, horrid though it is. Just got to hope no bushfires break out, everything is tinder dry now and ready to burn!
  6. Geoff Barnes

    Optolong Filter

    I agonised over wether to go for a UHC or O-III after reading so many opinions, maybe I made the wrong choice? I am very keen to see the Veil, but I'm pretty sure it only just gets above our horizon for a brief period in winter. It is up now, but alas it is the middle of the day here!
  7. Geoff Barnes

    Optolong Filter

    Thanks Gerry and Paul I have mostly used the UHC with my Baader Mk1V zoom, and found through trial and error that it worked best at 24mm FL on nebulas, but still I preferred the unfiltered view. I have a Skywatcher 32mm plossl on order which should arrive any day, I will most certainly give that a good testing with both the UHC and the H-Beta in due course!
  8. Geoff Barnes

    Optolong Filter

    It's interesting isn't it? I bought an Astronomic UHC a while ago expecting great results and I have to say I am completely underwhelmed by its performance. I've been using it a lot on nebulas such as Orion, Carina, the Magellanic Clouds to name a few during nights of really good seeing and I have to say in all cases I preferred the unfiltered views. Now it may well be just my particular eyesight is a bit strange, I don't know, but in my 12 inch Dob I just love the bright sharp unfiltered views it gives me, the UHC just seems to dim and mute everything. Due to very limited funds I'm always looking to save as much as possible when buying astro equipment so I was somewhat annoyed after paying Astronomik prices to be disappointed with it. I will be very interested to see how the Optolong filter performs when it arrives and will of course post my opinions in due course.
  9. Geoff Barnes

    Optolong Filter

    I have recently ordered one of these H-Beta filters in my pursuit of the elusive Horsehead. Does anyone have experience with these filters or this company's products? They are certainly a lot cheaper than many competitors and seem to use high quality materials. "Optolong H-Beta 25nm Filter - 1.25” This Optolong H-Beta filter has a FWHM of 25nm, making it more suitable for visual observations of the Horsehead, California, and Cocoon nebulae. The filter transmits a 25nm bandwidth of light that is centered at 486nm and precision blocks other transmissions, including wavelengths of light that are responsible for light pollution (both artificial and natural). When you use the 25nm H-Beta filter, you’ll notice that the contrast between the background sky and objects that emit H-Beta light increases. This allows you to see these elusive objects more easily, but you will still need a telescope with an aperture of at least 8” and a night of good seeing. The Optolong 1.25” H-Beta 25nm Filter is made with Schott glass that has been multi-coated with an ion-assisted deposition technology to ensure scratch resistance and stability on the central wavelength, or CWL. The filter cell is made of lightweight, strong metal and is CNC machined, sand-blasted, black anodized, and then laser engraved. The result is a super thin filter cell that will produce a clear aperture of 26mm. Quality Filter Materials: Schott B260 substrate material from Germany, 2.0mm thick CNC machined and black anodized aero-metal filter cell that is ultra-thin to provide largest clear aperture; Laser-engraved to prevent fading Multiple layers of anti-reflection non-cementing coatings applied via electron-beam gun evaporation with Ion-assisted deposition Optolong Filter Manufacturing Processes and Parameters Filter substrate is fine-optically polished to 1/4 wave and <30 parallelism over both surfaces Surface quality, according to MIL-O-13830, is 60/40 90% transmission at H-Beta 486nm 0.1% transmission Hg at 435nm and 578nm 0.1% transmission Na at 589nm High value transmission of pass-band and optical density of off-band is assured through Optolong’s planetary rotation system, a homogenous and precise coating procedure Thin metal cells have a clear aperture of 26mm for 1.25” filters Each filter comes with a plastic case with high pressure EVA case lining About Optolong Optolong is the Astronomy Filters division of Yulong Optics, an optical filter design and processing company out of Kunming, China that has provided filters for over 700 optical companies since 1999. All Optolong filters pass European Union RoHS requirements and have been certified by TUV Rheinland and Bureau Veritas."
  10. Geoff Barnes

    I need a collimating tool!

    I use a basic Cheshire only very occasionally to check the secondary mirror alignment, but I've never used anything for the primary alignment since I discovered Gary Seronik's Tool Free method, which is basically just a star alignment. https://garyseronik.com/no-tools-telescope-collimation/ It takes a matter of a couple of minutes to adjust the out of focus star image to the centre of view and away I go, nice sharp images and so easy!
  11. Geoff Barnes

    The Alpine Valley

    Yes Mike I saw that feature in the centre of the valley, it was faint but definitely there. I'll try again when the atmosphere is a bit less turbulent.
  12. Had a brief go with the Bresser Adapter and my basic Samsung phone last night. Just on low power 48x with the 12 inch Dob. Not too bad for a first attempt I think.
  13. Geoff Barnes

    The Alpine Valley

    Hi John, because we're nearer the equator than you Sirius gets up quite high at this time of year, I would guess about 60 degrees or so recently, so a good height for observing. I should have added that the seeing was quite unsteady last night after a hot 36 degree day, so lots of thermals moving around up there!
  14. Geoff Barnes

    The Alpine Valley

    I've been pushing my 12 inch Dobsonian to its limits lately to see just what it is capable of. E and F in the Trapezium have been relatively easy targets this last few sessions, and Sirius B whilst not easy because of Sirius' brightness, was also clearly there. Tonight I decided to study the Moon, and in particular Vallis Alpes, the Alpine Valley. The Valley itself is of course an easy target, but I was more interested in seeing the Rille that runs through the centre of the valley, which I understand is quite a challenge. I started with the Baader zoom, tried all magnifications available but alas saw no sign of the Rille. Time to bring out the big guns, the Morpheus 6.5mm first, quite a bit bigger in the EP now but still no sign of the Rille. Okay out with the Explore Scientific 4.7mm 82 degrees, surely this is the one. Nope, nothing! Only one thing left, the 2x Celestron Ultima Barlow, tried it with all 3 EP's right up to 535x (which was hopeless), still nothing. A complete failure, although good fun trying! So, I'm left with the probable explanation that the elusive Rille is probably only fleetingly visible when it is right near the terminator and a shadow is cast in it. Probably if I had tried last night or the night before I may have seen it? Can others who have had success confirm this please?
  15. Geoff Barnes

    Evening 14/01/2019

    Nice report Astro Imp, glad you had a good session. I was hoping to myself but was defeated by the mosquitos, who were eating me alive!
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