jamesj01
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Posts posted by jamesj01
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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.
nice photo aswell and cheers for the help
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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
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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?
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@Louis D ok many thanks for you help
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@Louis D thanks for the really good picture this helps alot. Would you recommend a Barlow then instead of a 32mm eyepiece for DSO photography?
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28 minutes ago, Louis D said:
Yes, as long as you can reach focus with prime focus. Reaching focus won't be an issue for Barlow projection.
okay brilliant so to do this i juts focus the telescope as i would normally with the barlow lense attached?
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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.
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@Alien 13 sorry i am new to this all - is it better to use a barlow lens or prime focuser instead of an eyepiece when taking photos of DSOs?
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Hi everyone,
recently just purchased a 32mm Omni Plosl 1 1/4 inch eyepiece - https://www.harrisontelescopes.co.uk/acatalog/celestron-omni-plossl-32mm-eyepiece.html. However, it does not fit into my camera - to - telescope adaptor piece due to the body of the eyepiece being to wide. Are there any adaptors i can purchase for this eyepiece?
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@Chefgage how do you focus for the moon - do you follow the same process?
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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
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1 minute ago, Chefgage said:
Do you then re-focus using the X5 zoom and then again using the X10 zoom in the live view?
sorry juts to clarify, the X5 and X10 zoom are the buttons on the camera correct?
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Just now, Chefgage said:
When you look through the eyepiece the moon and stars look clear/sharp. This tells us the focus is ok. When you then connect your camera how are you focusing it? Are you using the live view and then zooming in the get better focus?
Yes, when i connect my camera it is in manual mode and i am using the focus knobs on the telescope to achieve the cameras focus
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@MarkAR i will look into that - are they used primarily if you wanted to photograph an object in the sky?
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@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
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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
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@Philip R thanks have purchased the book and a celestron 32mm eyepiece!
Will look into filters shortly and once i have gained enough knowledge as there are plenty of choices
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@Philip R brilliant thanks for this took my first moon shot - stunning if i say so but sadly one of the easier things to photograph in the sky
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@Mick H will most likely go for this eyepiece - seems promising thanks
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@Mick H no worries - that image looks amazing though!
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@Philip R think i am starting to understand - so high power lenses for objects such as the moon and lower power for deep sky correct?
Both look brilliant and will have a go with the resources tab. Many thanks
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@Mick H also thanks for this, stellarium proves to be extremely useful. will also have a look at your recommended clusters. are they good to capture in astrophotography?
DSLR camera adaptor for Omni Plosl 32mm eyepiece?
in Discussions - Eyepieces
Posted
many thanks