Gina

I can't dictate when my neighbours have their ultra-powerful floodlight on though I know I can complain if their light impinges on my property but I want to get on with them and not have friction of any sort. That is more important to me than a good view from my ASC. When I built my observatory the neighbours then were not very friendly and rather than brew up a storm I built the observatory to protect my imaging equipment - telescopes or lenses - from that light. I could arrange that my ASC also has some sort of protection from the light. There are two ways I could shade the ASC from the light - arrange a shade attached to the ASC or position it in a shadow area. The former method would be easier. It can be a permanent feature as there are trees behind their house and I don't need the view. When I had the dome on I was considering protecting it from other lights much further away but without the dome those are no problem. The two images below show the present night-time situation and the daytime view. The light is near the apex of the roof on the white building at about 4 o'clock in the daytime view.

Next door have switched on their flood light When I had a dome this caused such reflections in the dome that no stars could be seen. Without the dome there are still reflections in the lens but not as bad. Next time I see either of them I'll try to remember to mention that their light interferes with my astronomy and get them to switch it off when they don't need it. I might add a little screen to shade my ASC in that direction for when the light is on. It would be easier to keep the light off the lens than a great big dome.

Looking dark outside now but it isn't really Some lights coming on though - mainly house lights and the odd car. Second image shows more lights including some distant street lights, the red lights in the tree at 7 o'clock are on the Stockland Hill TV and radio transmitting mast. A few stars showing.

Readjusted the focus using the far horizon. Put back out on guttering and captured image. With the angle of the pole and hence ASC, the coverage is not horizontal showing the field in the foreground. The shed at about 8 o'clock is my observatory. The moon is just above it and rising. The second image is with the bottom end of the pole positioned away from the window a bit.

Onto the electronics then... Of the available INDI drivers, the Astroberry Focuser seems to be the only one that drives stepper motors so I shall probably use this for the cover motor to start with. It's not ideal but will do until I manage to write my own INDI drivers. Another possibility would be to use an Arduino Nano to drive the motor and control that with the Astroberry Board which has four ON/OFF controls. I will already be using this to switch the cooler and dew heater and the another line could operate the cover. OFF = Closed and ON = Open. It should be relatively easy to edit the code for the Astroberry Board to show the correct labels.

Brought the rig back indoors and can see why the focus was wrong - the lens support wasn't properly on the camera - it was up a bit on one side. Daft duffer! Clear sky forecast for tonight until around midnight but the moon doesn't set until nearly 2am tomorrow so no chance of seeing any stars tonight! The moon is 78% full, so very bright.

All this needs thinking about but the easiest option is to stick with the RPi and INDI and only use this ASC for lower light situations. I guess it might be possible to use the one ASC for all light levels but it would need different software unless or until INDI match their minimum exposure to that of the camera. It really does seem strange! I'll have another go at trying to register with the indiserver forum - tried before but it didn't work. I have an RPi camera with fish-eye lens attached, on order with deliver on a very slow boat from China, that might do me for daytime imaging. I also have a couple of acrylic domes on order to look at and consider, due to arrive next month.

This morning the sun is out but with a bit of cloud to the east. Again running SharpCap and this image was taken with gain set to 0 and Auto Exposure giving 0.4ms gamma 25. I believe this shows that this arrangement could by used for daytime imaging as well as night. Unfortunately, not with the RPi and INDI driver though as that only goes down to 1ms exposure.

Left the ASC running overnight capturing PNG images with SharpCap, continuing after the moon had set. These were 10s exposures at one per minute to keep the number down a bit with gain on Auto, gamma on 25. As before, this is just the camera and lens mounted on aluminium pipe and hung on the guttering. A couple of things are evident. The lens is not straight (focus is fine top right but out at bottom left of image) and the camera needs cooling to reduce noise. Surprisingly there was no sign of dew but maybe there was heat coming from the camera.

Clouds may be going...

This is better - flipped in GIMP.

Just realised what's wrong with these images - they're reversed - east is to the right!! Very strange!

The sky is now pretty much covered in clouds And waiting for the moon to set but it looks like I would have to wait until nearly 1am

Gamma reduced to 20.

Exposure increased to 10s.

Auto White Balance turned on.

Well, that's better This is with 5s exposure, gain on Auto and showing 240, gamma on 50 and brightness on 1. No camera cooling and no dew heater. Image capture with SharpCap and this is just a screenshot of the Preview.

I opened the window and did my best to focus on the moon. Then put the camera on the pipe and hung it on the guttering. The FOV seems alright though can't be sure until it's in it proper position on the observatory. Here's a screenshot from SharpCap. Out of focus unfortunately. I've cropped the image in the X axis only. Bright lights cause reflections in the lens, it seems. This is without a dome. Think I'll bring it in and try focussing on the moon again. The sky has almost cleared now.

I could do with a finer method of adjusting the focus than just by moving the lens in its support tube. The screw adapter wouldn't engage with the offset, hardly surprising. I'll do some more thinking

New print is fine though the lens is a little tight in the tube but the offset isn't enough. I reckon it needs twice as much so I'll change the design and print again. I've increased the offset by another 0.7mm giving 1.2mm altogether. If this is too much I can turn the support on the camera to reduce the Y offset and add a bit of X offset, which doesn't matter as there's plenty of room in the X direction. In fact there is already some X offset which I could reduce by turning the support tube in the right direction.

The print is a nice tight fit on the camera but too tight on the lens so increasing the lens tube by 0.2mm diameter which should be about right.

Now printing my third attempt at a lens support that fits First was a little too small, second a lot too loose so now on the third which is just 0.2mm bigger in both the camera and lens fittings than the first. Fingers crossed.

Photo of the camera and zoomed in to aperture showing sensor and alignment grid.

Added a marker to show north (or south, depending on which way the sensor is out).

Here is a design for the lens support with the inside offset by 0.5mm from the rest. This is the basic shape and I'll add holes I can tap for grub screws once I've checked this for sizes. You need a keen eye (or a ruler) to see the offset as it's pretty small. Side view, top view, bottom view and cross-section.