Bill, One way to test subframe accuracy would be to take some full frame images in different parts of the sky (you can use APPM and have it save all the FITS images). Then, create a subframe image

Dec wasn't really all that different. RA was, about 4x different. I still have all the models I tested so I can poke through them this evening after I setup for the night. I can run a few points

Bill, didn't you say you were getting more substantial RA and Dec Errors last night (maybe I misunderstood?). I recommend full-frame unless you run into memory limitation issues. I always got better

The reason I'm asking is that I used the subframe option last night with ASTAP and I had been using full frame prior. The measured differences were not minor. This scope has a massive FOV with this

Let's assume in the full frame there's 10,000 stars, the sub frame has 2500 but uses a centered crop. That's still a ton of stars.

Not necessarily. With fewer stars there is less "averaging" of calculations and effects of seeing. -Ray

BTW, although it can be true that distortion is symmetric, there is no guarantee of that, or that it is at the exact center of an image. For example, if the scope is not collimated or there is sensor

So if one used a sub frame in this distorted field scenario the solving results would be of greater accuracy since the distorted portion of the frame was no longer present?

The center coordinates are determined based on the solving of angles and distances between stars. If these values are distorted then the center coordinates can be miscalculated to some degree. So,

On Sat, Jul 23, 2022 at 03:37 PM, Ray Gralak wrote: I don't know how Pinpoint does it either, but it is obvious how it could be done dynamically without a model. The reference is the star catalog

Hi Dale, To prevent this for both USB and Ethernet cables, I first wrap the cable around the OTA or focuser a couple of times and in a loose knot, then connect the cable to the device. If there is a

Yeah a big advantage with ethernet is that you can easily crimp your own cables. I wired my house with cat6 (I actually do run a 10Gb ethernet network here). I've got a few hundred feet of cable in my

Nice! Sent from Yahoo Mail for iPad

I don't know how Pinpoint does it either, but it is obvious how it could be done dynamically without a model. The reference is the star catalog that is being used. Once the app finds the approximate

It may have been that you started NINA first, then connected the camera to your system, and didn't press the refresh button to update the list of connected cameras? /dale

What you think is correct - from an app's perspective, cameras can do only one thing at a time. The image has to be downloaded before the command to start the next exposure can be given. But, on CMOS

60 millions pixels, times 16 bits per pixel, divided by 8 to convert to bytes, does yield 120MB images, modulo the extra little bit for file format headers. A note about binning - on CMOS, any

Yeah, I'll give you that, there. It's not so much the fault of their design but rather the use cases they're being shoehorned into. An inordinate amount of my abject ire towards micro, and mini-USB

If pincushion or barrel distortion is a major factor in plate solving accuracy then I would expect the results to be OTA dependent. Some scopes have more or less distortion than others. This could

. Toni I had a far different experience with NPAE, Mine arrived well packed and in pristine condition. The nose piece is a little thicker than what yours was measured at. I had no scratches and no