A week or so ago I wrote about acquiring a Rollator-style walker to cope with some balance problems I have. It is an all-terrain model with pneumatic tires. At the time all I had was a product photo from the seller's website.

This post includes some photos of my Rollator in use. The other day I took it out for a full-blown test. I loaded it up with more gear than I would ever take at one time, and then headed out for a two mile wander around a small lake at the local state park. The path varies between gravel and dirt and some grass, and it while it is flat, it is not smooth. The Rollator passed with flying colors.

I purposely over packed the gear in my photo bag for my test run. I packed with a DSLR camera body and 4 lenses and a Sirui travel tripod; a full-sized Benro tripod; and a Sigma 150-500 telephoto lens along with a gimbal mount. In other words, a whole bunch of stuff. Below are some photos that show the Rollator both packed and in action.

I am thrilled with this whole set-up. It will give me more opportunities than I have had in a while. If anyone reading this has some mobility issues, this might be something to explore.

.

There is not a teleconverter made that improves an image, so, there is only one way to go with a teleconverter, and it's not a good thing.
Look, your Z-50 is an aps-c camera, so any ff lens you put on it will automatically get a bump in field of view.
So, put a prime 400 on your camera, and it becomes a field of view of 600 mm WITHOUT a teleconverter.
My suggestion, try the 400 on your Z-50, my most telephoto lens is a 600 prime, I do wildlife professionally, I need nothing more than that for 99% of my work.
800mm entails a lot of expert handling to assure a strong sharp image.
Do us all a favor and put your money into a 400 or 500 prime and do not pass go, and do not purchase a teleconverter.
BETTER SUGGESTION
Buy the Nikon 180-600, this lens will give you a field of view of 270-900mm. You will not ever need anything else for wildlife photography, this lens is much sharper than any Sigma lens on the market in a similiar focal length.
Read the reviews on the Nikon 180-600, they are very good for a lens under 2 grand.
Plus, a zoom is more versatile than a fixed prime.
In the field I use the Sony 200-600 for much of my work, I do have a 600 prime but within a 100 yards, it is really hard to tell the difference between the two.
Below is an image with the 200-600.
If I were you I would consider this lens, the Nikon 180-600 as your go to wildlife lens.
Good luck and keep on shooting until the end.

Thanks Jimmy! I'm holding off upgrading to newest Mac OS because I fear Studio 2 will no longer work

Since you mentioned available light: I took a photo of that children's slide one or two days prior to this one. The morning was flat light, overcast, no shadows. Failure! Thankfully, I went back when was bright, sunny and early (my favorite time of day).

To add to my page 2 comments that address the topic question directly, my #1 inspiration is light, the more dramatic the better!

https://live.staticflickr.com/65535/53590188273_52f9561536_o.jpgBus Stop by Linda Shorey, on Flickr

https://live.staticflickr.com/65535/53521312101_8e13b601bd_o.jpgThe Fire is Within by Linda Shorey, on Flickr

https://live.staticflickr.com/65535/53590523147_904acfc1ae_k.jpgYou can't eat this green stuff! by Linda Shorey, on Flickr

https://live.staticflickr.com/65535/53088907120_a9c9803dd2_k.jpgWild Morning Glory by Linda Shorey, on Flickr

.