Telescope and Camera image size test

I was doing some visual observing with my Meade LX70 refractor. I then tried connecting my Canon T3i and was disappointed with the results. I was looking at Jupiter and could make out some of the bands and the moon with the different eyepieces but the image was way too small on the image with the Canon. So, I did a test some tests. I tested all three of my telescopes (Meade ETX90EC, Meade LX70 refractor, Meade Lightbridge 10”) with my two cameras (Canon T3i and ZWO AS103MC).

The results are in this wiki article called “Image Size Test”.

The first thing that is interesting is of course the difference between the image with the 55 MM camera lens and any of the telescope images. But, the more critical comparison is between the telescopes themselves using the different cameras.

The ZWO camera results is significantly closer image than the Canon regardless of which telescope is used.

When comparing the ZWO images, I was surprised the ETX had a larger image even though it is a small diameter. I will need to do more research. The Lightbridge image is very puzzling. It is a significantly larger diameter and the image isn’t a similar order of magnitude bigger. In fact, the Lightbridge doesn’t look much bigger than the ETX.

Related to the Barlow, the image size is noticeably larger.

Though not related to this test, the blurry images are a problem but again the test was during the day going through a window.

To summarize, interesting results and will need another test using a night time object like the moon.

daylight test 55mmimage size test Capture_00005

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LX70 Refractor and Canon DSLR

I decided to do some research on the options to connect my Canon DSLR to the Meade LX70 Refractor.  I had a special adapter for the ETX 90EC that allows the Canon to connect along with a T-mount adapter.  So, I first searched for adapters for the LX70 but didn’t find any.  I did find that Meade sold a camera adapter that connected to a DSLR and then went in the 1.25” eyepiece holder.  This sounded like a great idea because I could then use it will all my telescopes.

I did some more research and found a great article about taking lunar photos through a telescope.  The article mentioned three ways.  One way was afocal photography which I was aware of.  The camera adapter would enable eyepiece-projection photography.  This was interesting because it actual uses an eyepiece so would allow for different magnifications.  But the drawback in the images are dimmer.

The third option was prime-focus photography.  I guess this is what I am doing with the Canon and ETX.  The article mentioned you could buy adapters for many telescopes so started doing that research.  I found a number of options including adapters that already had the T-mount.  But, then I had a thought.  There was a part in the box for the LX70 Refractor that I didn’t know what it was.  I took the T-mount adapter and tried to screw it on to the mysterious adapter.  It worked.  I then put in on the diagonal and it all works.  I added the Canon and tried to focus on a distant power pole.  I couldn’t get focus similar to what happened on my Lunt.  I guess it was time to research extension tubes.

But, then I had a thought.  The diagonal was removable so I took it off and added the DSLR and adapter to the back of the refractor and it all worked.  I was able to get a focused.  So, guess I already have everything I need to use the DSLR with the LX70 Refractor.

ClearSkyTonight_LX70_Refractor_DSLR_4ClearSkyTonight_LX70_Refractor_DSLR_1ClearSkyTonight_LX70_Refractor_DSLR_2ClearSkyTonight_LX70_Refractor_DSLR_3

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Finder Scope for Meade LX70 Refractor

The Meade LX70 Refractor came with finder scope but realized it would be difficult to use with the telescope was pointed straight up.  I remember purchasing an Orion Right-Angle Finder Scope earlier and it didn’t work out.  So, I found it and it easily fit on the LX70 Refractor.

ClearSkyTonight_finder_scope_1ClearSkyTonight_finder_scope_2

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Purchased Meade LX70 Refractor

ClearSkyTonight_Meade_LX70_Refractor
I purchased a Meade LX70 mount to use with my Lunt solar telescope for the solar eclipse.  I was thinking about my next plans on the telescope models since I now have a reflector in the from of the Light Bridge 10” and a small compound in the ETX 90EC.  I had read before that small refractor is the best for astrophotography but feel that is a long way off.   But, I did some other reading that refractors are better for planetary viewing because they give sharper images then reflectors.  So, I thought it might be a good idea to get a small, cheap refractor to experiment with that type of telescope model.

I had planned to wait until Christmas for a sale but I looked at Meade’s website for the LX70 telescope and noticed the 5” LX Refractor was being discontinued.  So, I checked around on the telescope store website and found one still in stock and purchased it.

It arrived and of course mounted easily on the LX70 mount.  Definitely needed the counterweight unlike the Lunt.

 

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Meade LX70 Dual Axis Motor Kit

When I purchased the Meade LX70 mount, it was during a sale and all the accessories were on sale to.  So, I thought it might be nice to have the motor kit as well.

The motor kit consisted of two motors and gears about with a controller and battery pack.  The assemble was straightforward from the manual.

LX70_motor_1 LX70_motor_2 LX70_motor_3

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Lunt dovetail

In my research for a way to mount the Lunt LS50THA to the Meade LX70, I found out Lunt sells dovetail plates so I order one. 

It came with screws which was nice.  I moved them to the inner position and they aligned correctly with the Lunt.  I did need an Allen wrench so decided to get a new one to go with my astronomy tools.

The dovetail fit fine in the LX70 and secured with the main screw.  The only drawback was the second screw didn’t work in the locking position as it would have with the included dovetail.

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