JEM_svca

Hi Steve, Sorry for the delayed response. Things have been pretty hectic here with all the government restriction causes by the corona virus. Is there a way to PM you through SGL? I am relatively new to this website.

Hi Steve, Thanks for the other links. I would like to have a further discussion on the rationale behind stacking but since this thread is about Eagle Core its probably not the right place to do it.

Hi Steve, Thanks for this link to Dr. Glover's lecture. It was very interesting. Do you know if the author has a publication that covers the same material?

Hi Steve, Glad to hear you are feeling better and got a chance to test out the Eagle Core Guiding. Its nice to see it is working out for you. With your guide camera the Eagle Core is probably able to utilize the full camera sensor. I am surprised that you didn't have any calibration problems if there is significant DEC backlash in your mount. I get error messages when trying to calibrate with my AVX mount and using PHD2. That is why I turn off DEC guiding. As long as I have good polar alignment I can still get good images with 12 minute exposures. Haven't tried anything longer.

Hi Steve, I agree with you that there seems to be very little user feedback about the Eagle Core online. It makes you wonder how many people are really using it. In theory it is a well made, compact, simple to use device that doesn't use much power, and could really do everything I need when out at dark sky sites. I hope to hear about your experiences. While the Eagle core is useful to me as it is, I would be much more pleased with it if they could simply add the LENR tweak, despite its guiding limitations. If they could add more features to the guiding software, such as the ability to ignore bad pixels, utilize the full camera resolution, and the ability to specify declination angle for each target to avoid recalibration, it would be almost perfect. I doubt they can do anything to allow for full camera resolution because of processor limitations. I might be able to get by with 2x2 pixel binning, but I don't want to lose field of view. PLL wouldn't tell me if their process uses binning or a subset the sensor image area.

Hi Steve, Sorry I misunderstood. As already discussed, it would be nice to be able to create a bad pixel map for the guide camera. Regarding the DSLR, it seems like it would only take a small tweak to the Eagle Core firmware to delay uploading the image until after the in=camera long exposure noise reduction is finished. The camera itself is able to do this when not connected to the Eagle Core.

Hi Noah4x4, Just to be clear all my comments are with regard to the Eagle Core and do not suggest any limitations for the Eagle 3. You can't load any image processing software or any other software into the Eagle Core like you can with the Eagle 3. With the Eagle Core you are limited to the functionality built into the unit. Hi Steve, Regarding dark frame subtraction, this is done in my camera when you turn on the log exposure noise reduction feature. I wasn't expecting the Eagle Core to do this for me. I was hoping instead that it would simply be intelligent enough to display the end result. Unfortunately it doesn't display any image when the LENR feature is used. The camera however, still records the image. I just don't have any way to see it unless I disconnect the camera from the Eagle Core and look at the image on the camera display. This is a real nuisance.

Hi Noah4x4, The Eagle Core is designed to take photos through a DSLR or comparable mirrorless camera that store all photos internally. It is also designed to allow guiding with typical guide cameras. However, I found that when I tried to use Eagle Core to guide with my ZWO asi178 (3096 x 2080 px) it reported that the camera resolution was only about half the actual pixel count in each direction. I don't know if they were using a smaller portion of the sensor or binning the pixels. When I asked PLL about this they said it was necessary to prevent overloading the processor. Unfortunately this was not mentioned in any of there spec sheets or the manual. This was one of the reasons I don't use the Eagle Core software for guiding. I use the Eagle Core camera control software with my DSLR (24 mpix) to control exposure time and the number of photos taken at each exposure. When an exposure is completed the camera downloads a copy of image to the Eagle Core through a USB connection and then displays it wirelessly on my ipad. The Eagle Core only stores the image temporarily until it is overwritten by the next image or the unit is shutdown. It takes a few seconds before I can see the image after the exposure is completed. I suspect that the delay is mostly due to the wireless data transfer. This is not a problem since my exposures are generally long and I have plenty of time to view images between shots. I can also zoom in to see if I have round stars.

Hi Steve, So far I am the only one in our group using the Eagle Core. Most of the members are doing visual observation with dobs. Other members of the group who do Astro photography are using wired systems. Since I am close to the scope when doing my photography I haven't had any wireless connection problems with the Eagle Core, but I am only using it for goto and camera control, not guiding.

Hi Steve, Thanks for sharing those images. Amazing how much you were able to capture by using mosaics. I hear UK is overcast a lot so I can appreciate your problems with the weather. I am surprised that quite a few people there have telescopes and do Astro photography. While it doesn't rain a lot in California, it rains pretty hard when it does. The biggest problems are cloudy or overcast skies, light pollution, wind, and atmospheric turbulence. I think we all have problems waiting for days where all visibility factors are good simultaneously. There are two dark sites I go to. One, Chuchupate, is about 75 miles from home at an elevation of about 5500 feet. The other, Camp Ferguson at White Mountain, is about 265 miles away at an elevation of 7200 feet. Our astronomy club rents Camp Ferguson (a primitive camping site) once or twice a year and we usually spend about five nights there. We have to make reservations six or more months in advance so we are stuck with whatever weather we get. I have only tried mosaicing once. I used a 17 mm lens, and several 30 sec exposures without tracking, to get the Camp Ferguson location shot shown below. The Andromeda shot in the previous post was taken from Chuchupate, which has a nice parking lot (without lights) to set up in. The Eagle Core works very well for me in a portable wireless setup for finding targets and taking pictures. I used to push the camera exposure button by hand timing the exposures with my watch, and often lost track of the time. I was looking for an intervalometer but a good one was expensive. I found that the Eagle Core provided more capabilities and a wireless connection for around the same price, so I decided to give it a try.

Hi Steve, I live in California and do my Astro photography at dark sky sights were I don't have access to mains power. I use the Celestron Lithium power tank to power the mount directly. I have been very happy with it. It is lightweight and never seems to run out of juice. It also holds its charge over long periods of inactivity. I power the Eagle Core and my laptop with a Yeti Goal Zero 400 watt hr lithium ion battery/inverter combination which I recharge with solar panels after each nights use, and I use it to recharge the power tank when necessary. So far I haven't had to deal with dew heaters. If I had to use dew heaters I think I would need to get a bigger mount and I would mount the Eagle Core with the scope because of the extra wiring. Attached is a photo I took of Andromeda, 4 light frames, no darks or flats.

Hi Steve, I verified that I could make slews or goto's with the AVX keypad without affecting subsequent wireless goto's made with SkySafari from the ipad through the Eagle Core and vice versa. Attached is a picture of my setup using the Eagle Core.

Hi Steve, That is a good disposition. I hope it works out for you. It would be nice to control everything wirelessly and only need one tablet or laptop.

Hi Steve, When you use the gain adjustment process are you still able to find a properly unsaturated (i.e. not over saturated) star for guiding. I don't think the Eagle Core app gives you any information on star saturation. The guide star image intensity profile should be a smooth curve otherwise it is more difficult to determine the center of the star for tracking purposes. PHD2 will show the star intensity profile so that you tell if it is over saturated (flat top profile). I suppose lowering the gain is less likely to produce over saturated stars, but some can still be very bright. It is still nice to be able to see the profile to make sure.

Hi Steve, Let us know how your guiding with the Eagle Core works. One of the things I noticed was that the Eagle Core did not have any way to build a bad pixel map for the guide camera. This was one of the features that I appreciated in PHD2. This supposedly helps to prevent choosing a hot pixel as the guiding star.