Dobsonian Images

3 years 8 months ago #105555 by Burner
Dobsonian Images was created by Burner
I use a small point and shoot camera (and sometimes my phone!) to grab shots from the 25 mm eyepiece of a Dobsonian mounted 8 in reflector of the moon, sunspots, and sometimes Jupiter. I appreciate the limitations of this method but sometimes I get good snaps. However other times, even though I'm convinced the eyepiece is perfectly focussed, they are
way out of focus even though I often use a clamp to hold the camera in position. Is there a way of doing this better which has so far escaped me? (I tried to attach some pics but they seem to prevent the post being submitted)

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3 years 8 months ago #105556 by Burner
Replied by Burner on topic Dobsonian Images
Here's one I took recently that worked out reasonably ... a very small file, hope you can make it out!
Attachments:
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3 years 8 months ago #105561 by scfahy
Replied by scfahy on topic Dobsonian Images
Nice image thanks for sharing

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3 years 8 months ago #105563 by Kinch
Replied by Kinch on topic Dobsonian Images
I would be surprised if you could not find something out there that will work all the time for you - trouble is....once you start buying gear for this hobby....there is just no end!

Looking at the picture above (and noting that you also shoot Jupiter at times) I'd say you are off to a good start. Perhaps someone can tell if there is a club near you - to talk with other guys. Where are you located?

This search page may give you ideas!
www.google.es/search?q=camera+holder+for...IMg&biw=1596&bih=954

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3 years 8 months ago #105566 by Burner
Replied by Burner on topic Dobsonian Images
Thanks for the link! I have one of those mounts (first one on the page) for my Fuji Point & SHoot camera but focussing is hit and miss. Brilliant when it works but a few frames later it can be out of focus without me touching anything. Could it be caused by atmospherics? Or the foibles of automatic focussing? I tend to focus the eyepiece first, then mount the camera but the pics are not always sharp. I suppose the question I struggle with is: does an eye focussed eyepiece guarantee pin sharp photos or is automatic focussing somehow independent of that?

By the way these pictures are single exposure shots. The attached is a cropped photo which was taken at 100 ISO, 1/125 second, F 3.3 with, if my memory serves,a minus 2 EV compensation because of the glare. Focal length of the camera was 5.9 (35mm equivalent was 35 mm). Postproduction is usually a touch of sharpening and contrast correction. Because they are JPGs and not RAW I don't bother with Photoshop or Lightroom and just use Picasa.

I live in Balbriggan but am not yet aware of any local astronomical societies.
Gerry
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3 years 8 months ago #105567 by michael_murphy
Replied by michael_murphy on topic Dobsonian Images
Hi Gerry,

There used to be a Balbriggan club. They still have a facebook page.
Meath astronomy club meet in Rathbeggan lakes and the Irish Astromomical Society meet in Clontarf once a month not exactly local but nearby.

Michael.

IFAS Chairperson.

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3 years 8 months ago #105568 by michael_murphy
Replied by michael_murphy on topic Dobsonian Images
Hi Gerry,

There used to be a Balbriggan club. They still have a facebook page.
Meath astronomy club meet in Rathbeggan lakes and the Irish Astronomical Society meet in Clontarf once a month not exactly local but nearby.

Michael.

IFAS Chairperson.
The following user(s) said Thank You: KevinSmith

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3 years 8 months ago #105571 by KevinSmith
Replied by KevinSmith on topic Dobsonian Images
Hi Gerry.

We will be having a fair few Astrophotography nights out at Rathbeggan lakes with Meath Astronomy group. It may seem far but its actually only about 35 min from you as its motorway almost all the way there. At least one of the nights will be doing a 'bring what imaging equipment you have and we will see what we can get working for you' with a view to identify possible next steps for progression. I also sometime Google hangout or Teamviewer to help people with some of the basics/intermediate planetary imaging remotely via laptop.

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3 years 8 months ago #105572 by Burner
Replied by Burner on topic Dobsonian Images
Thanks, sounds like a plan. How will I know when? Will they be advertised here?

Gerry

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3 years 8 months ago #105573 by KevinSmith
Replied by KevinSmith on topic Dobsonian Images
Do you have Facebook? if so most events are posted on Meath Astronomy Club. There is one tonight but there will be a talk only due to weather.

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3 years 8 months ago #105574 by Burner
Replied by Burner on topic Dobsonian Images
I found that FB page and I will get in touch. Many thanks.
Gerry

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3 years 8 months ago #105577 by Burner
Replied by Burner on topic Dobsonian Images
This view of Jupiter was captured using a Dobsonian mount.
Gerry
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The following user(s) said Thank You: michael_murphy, Kinch

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3 years 8 months ago #105579 by flt158
Replied by flt158 on topic Dobsonian Images
The GRS is seriously orange. Thank you.

Aubrey.

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3 years 8 months ago #105580 by Burner
Replied by Burner on topic Dobsonian Images
Yes, it was a single shot exposure and perhaps post-production could have been a little more subtle. But the planet was relatively low in the sky and I was surprised to get any detail in the image. If you squint you can just about make out the Great Red Spot!
Gerry
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