The first optics I used to image deep sky astronomical targets were fast Nikon telephotos at 200mm (f/2.8). To image the milky way I started with the Samyang wide lens at 14mm (f2/.8) that I replaced with the excellent AF-S NIKKOR 14-24mm f/2.8G ED. I was shooting with a stock un-modified Nikon D750 and the tracker was a Star Adventurer with a Manfrotto/Gitzo tripod. My very first tripod, the one I used to shoot my very first milky way images in Kefalonia island was a small Gorrilapod!
I am still using DSLR lenses, especially when I am travelling to dark skies. One of my most used DSLR lens is the Samyang 135mm f/2.
Imaging with FSQ-85ED
Now, I am using various setups. All of them are using the iOptron CEM25EC that has a high precision optical encoder system and advanced control technology and the Japanese refractors, Takahashi FC-60CB and FS-85EDP with their dedicated reducers and flatteners that lower their focal ratio considerably to allow me to capture more photons faster or just improve their image quality across the image field.
My favourite DSLR is a 36.3-megapixel Japanese astronomical camera from Nikon (D810A) that transmits light from the hydrogen-alpha spectral line at a rate that is four times higher than normal cameras, allowing me to capture faint details of nebulae that emit on that wavelength when I have access of a dark sky.
For narrowband imaging, I am using a Chinese astronomical CMOS camera from ZWO, the ASI 1600MM Pro Cooled Monochrome. With special astronomical 1.25' filters from Astrodon (USA) attached to a ZWO 8-position filter wheel, I can capture specific light wavelengths (Hydrogen-alpha, Oxygen III, Surlfur II, Luminance, RGB, Nitrogen II etc.) and combine them using variations of the Hubble palette.
Narrowband imaging with FS-60CB
My astronomical software of choice is PixInsight. I am using Photoshop as well. The capturing software I am using are SharpCap and SGP Pro.