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jamesj01

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Posts posted by jamesj01

  1. 12 hours ago, Louis D said:

    I have limited in focus with my Newtonian, and I can achieve DSLR prime focus by screwing the optics section of my GSO/Revelation coma corrector (with a 25mm spacer ring) directly into the T-ring via an M48 to T-thread adapter.  It works as a weak Barlow at 1.10x to extend focus and also flattens the field while correcting coma.  I used it to take this photo of the 2016 Mercury solar transit.

    5869c8d9594b9_MercuryTransit20161a.thumb.jpg.64196abd38a2a160c5a73ee01093f827.jpg

    nice photo aswell and cheers for the help :) 

  2. 14 hours ago, Alien 13 said:

    It depends, some barlow lenses come with a built in T thread so you can connect directly but any extension has the effect of increasing the barlow lens "magnification factor" so a X2 can become a X3 which is sometimes useful for certain targets. For DSO imaging you want to keep the distance between the lens and camera as short as possible.

    Alan

    ok many thanks for you support :) 

  3. 5 hours ago, Alien 13 said:

    The best option for DSO imaging is prime focus however some scopes especially reflectors do not have enough inward focus travel to achieve this with a DSLR, the fix is to shift the primary mirror further up the tube which can work if the distance is small or use a barlow lens to move the focus point further out.

    In my opinion a barlow lens works far better than an eyepiece for this but you do end up making the scope much slower, fine for Luna and Planetary imaging but not ideal for DSO but in some cases its the only option unless you just use the camera and a lens on its own.

    Alan

    Brilliant thanks - when using a barlow to DSLR i take the extension tube of the adapter right?

  4. On 31/05/2020 at 15:31, Mick H said:

    👍 As Philip says.

    I use a Celestron Omni Plossl 32mm for DSO's, infact I use that eyepiece the most.

    https://www.firstlightoptics.com/celestron-eyepieces/celestron-omni-plossl-eyepiece.html

    @Mick H question - i purchased the 32mm Omni Plossl eyepice. Do you use it in photography and if so, how do you attach it to the camera? It wouldnt fit in my adpater i currently have.

    • Like 1
  5. 8 minutes ago, Chefgage said:

    Yes that's correct. How I focus my camera is to centre a star in the live view screen. I then set the focus by focusing back on forth looking at where the 'sweet spot' is. I then leave the focus on this sweet spot. I then zoom in to X5 on the camera and then repeat the process. Then zoom in X10 and again repeat. You will find at x10 that you only need a very tiny movement of the focuser to change focus.

    This process helps dial in the focus so that stars appear sharp.

    thats brilliant - thank you will try this tonight :) 

    • Like 1
  6. @alacant thanks for the speedy reply - my telescope uses a newtonian reflector and i dont know if it is collimated or not sorry. 

    When i look through the eyepiece without a DSLR attached, it is clear as daylight and the detail is amazing for both stars and the moon. It is blurry however through my camera. I strongly go with what you said about my telescope moving when i take my picture so i have purchased a remote. I have heard they are essential. So possibly there is to much movement when i press the shutter button?

    Many thanks

  7. Hi everyone,

    I am new to astrophotography and of course started by taking a photo of the moon (as attached) using my Canon EOS500D camera - 1/250 exposure time, 800ISO. I used my celestron 127EQ telescope with a adapter for the camera of course. I used no eyepiece. 

    However, i find that it is slightly blurred, and upon taking pictures of nearby stars, i also found them to be blurred, even with a high exposure time. am i doing anything wrong at all or is this simply because of my setup? 

    Many thanks

    IMG_3243.CR2

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