Hi folks! I am new here and also new to birding as well. I got inspired to take on this new hobby on a recent trip where I took a wildlife tour and was amazed by the magnification and clarity you can get from scopes. After some research, I decided on the Kowa and was able to get the new 88A on sale. It just arrived today and I wanted to get feedback on these star tests and if there appears to be any glaring problems.
Please keep in mind that this is my first time doing a star test, so there could be some problems with my setup:
My sense of the results are:
Let me know what you think of the results and if there are other tests I should run. I hope to take the scope out tomorrow for some real-world evaluation.
Please keep in mind that this is my first time doing a star test, so there could be some problems with my setup:
- These photos were captured using a DSLR without camera lens. Unfortunately the DSLR digiscoping adapter was not in stock, so on the camera I connected an extension tube followed by a clear filter, and then used two tripods to line up the camera and scope eyepiece as close as possible. Since this was a loose fit, it's possible the camera was not perfectly aligned with the scope.
- Used an artificial star (foil with pinhole + LED flashlight) indoors about 10m away
My sense of the results are:
- The rings look mostly concentric, maybe slightly oval but I am not sure if that could be due to camera/scope misalignment.
- The inner focus rings look pretty good.
- The outer focus rings are difficult to see, and is brighter on the outside, possibly a sign of overcorrected SA. There's also redish/purple ring that I don't know what that could indicate.
- There is a slight vertical line, possibly from the prism, which seems common to Kowas
Let me know what you think of the results and if there are other tests I should run. I hope to take the scope out tomorrow for some real-world evaluation.