Here are a few images of an Eastern Tiger Swallowtail Butterfly from our visit to Davidsons Mill Pond Park. The featured image is a single image shot with a Canon 300mm f/4 lens with a 2x teleconverter on a Canon 7D @ f/11. Image below was a Blend of 2 stacked images, blended in Photoshop with a soft edge on the seam. Field of View equivalent with the Canon 7D (1.6x crop camera) 300mm f/4 lens, Canon 2x teleconverter ~ 960mm. When using a 2x teleconverter your lens wide open will be @ f/8, not f/4 because you loose 2 stops of light with the 2x teleconverter. So I usually stop down at least 1 additional f/stop to help with sharpness because of the added teleconverter.
My second version of the Meeting House Image. This time a 4 image blend exposed for different sections, then combined in Photoshop. All at 24mm. I also tried 12mm, but the Meeting House looked too small in the frame. First I exposed for the brightly lit building. Then an exposure for the darker trees and foreground lawn. Then 2 exposures for the few stars that were visible at this angle. I used a technique of greatly over exposing the sky on one of these, then using levels in Photoshop to pull out a few more faint stars so they stood out more. Then combining those two layers. I also made a reverse mask of the bright building so I could replace the area around the building steeple with the dark sky with stars and darker trees. Then I manually layered and masked my layers to where I liked all the elements of the image so they looked like it was somewhat balanced.
The exposure for the stars was 30 seconds, the longest time so not to show movement. But being in NJ, I had to try a few times because a jet would fly through and leave a streak of light from the lights on the wings. Which in some ways looked interesting, but not what I was after. But it is New Jersey with constant planes going overhead, so maybe I will add it later.