What is your budget for B4 lenses now and in 2 months? What resolution will your deliverables usually be? 4K UHD lenses likely cost more than HD lenses although a good quality HD lens may suffice.
What distance to the action would you be at typically?
I’m assuming although the fight is well lit, you’ll still want something fast for crowd and other interior shots before and after a fight?
In 2016, I purchased a Fujinon HA20x7.8B M10 T2.4 Cine Zoom (B4 Mount) on eBay. The HD quality on a genuine Cine Zoom is quite good.
I think you may want something with a wider minimum focal length and faster aperture. That increases the cost and may decrease image quality somewhat. You may also want an ENG zoom with a servo zoom control; although I’m fine without it, your needs are more demanding.
Prices are all over the map for used gear so look around to see if you can find a good deal, but stay with lenses that are known to work well in HD resolution. Canon zooms tend to be less expensive and may be fine, but Fujinon does a very good job at making zooms. Price differences may reflect the condition of the zoom rather than the features. Something that seems a good deal may have problems due to age or abuse so read the description carefully. Good if they tell you when the Zoom was serviced.
Many old zooms were designed for NTSC/PAL television resolutions and may be softer when shooting HD.
For an expensive new lens, that gives you an idea what’s possible, this might be ideal:
https://www.bhphotovideo.com/c/product/889008-REGThis easily gives you the longer reach you need, but it may not be wide enough at minimum 8mm:
https://www.fujifilmusa.com/products/op ... index.htmlOr rent when you need it, this is likely wide enough and a longer reach:
https://bexel.com/products/fujinon-ua18 ... ngle-lens/Now the challenge is finding something older that that satisfies your needs and budget!
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