It took me a long time to jump to the Z mount, but I finally did in June when I ordered a Z9, which was delivered 3 weeks later.
In the meantime I needed lenses. Or sort of needed lenses - the Z9 I bought was bundled with an FTZ2, and I received the FTZ2 within a few days of my order. I could have simply put any of my current f-mount lenses on, but I chose to use only the 500pf.
I have a full set of f-mount lenses, and in many cases 2 generations of lenses. But I wanted to lean into the z-mount right away to get maximum use out of it while I still can. (I'm almost 69 years old. This could end up being the last camera.)
So, like you, I needed to decide a strategy on which lenses to replace. I like both primes and zooms, and the primes I normally carry were all F1.4. 35f1.4 Sigma ART, 50F1.4g, 85F1.4g
I have the Holy Trinity, and I have various travel and wildlife zooms.
For travel, which is possibly most of my photography, I have long carried only 3 lenses that must fit in my waist bag. (Bag limits the amount of lenses, thus weight, I carry.) Those lenses are 16-35vr, 24-70vr, and 80-400g
For wildlife, I mostly use the 500pf now, previously a 200-500 and before that 300F4+1.4 TC and 80-400g.
A huge focus for me over the past several years has been underwater photography, which is extremely limited in lens support. There I use the 16-35 and the 105 macro.
I have a number of nice lenses that I almost never use, including the 14-24F2.8 and the 70-200F2.8 vr II.
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So the strategy is to replace the most-used/required f-mounts with z-mount equivalents. Additionally, I chose to skip replacing lenses I almost never use. That simplified things a lot, so here are the choices and reasons.
First, underwater. Choices are both limited and clear here. 14-30 replaces 16-35 and 105s macro replaces 105 f-mount macro.
Second, travel. 14-30, 24-70f2.8 and .... ? The 80-400g is not so easily replaced by the similarly-sized 100-400 because it is significantly less wide, making it less suitable for travel.
Here a good alternate choice would be 14-30, 24-120 and 100-400, except I really like F28 more than 70 to 120mm.
At this point, simply covering my travel and underwater needs gives me a viable set of starting lenses. 14-30, 24-70f2.8, 100-400, and 105 macro.
Those three zooms cover my need for pretty much any other zooms. Other zooms now become interesting only in terms of specialized uses.
Which leaves my trio of F1.4 primes. Here is really the only sort-of dilemma as I have no F1.4 z-mount choices. Since I needed to get going fast, I decided to just make do with the F1.8 choices. I don't know I'll ever want F1.2 enough to pay the weight penalty as well as the price penalty. So I picked up the 35F1.8s, the 50f1.8s and the 85F1.8s.
And there is my set of lenses choices. I bought all but the 100-400 on sale during the 4th of July promotion. I had all of those lenses before I received the Z9.
I continue to use the 500pf on the FTZ2. I'm hoping for a 600pf (F5.6 - F6.3) at some point, and I am interested in the 85F1.2 once it comes out, except I'm scared of the pricing.
Because I had this stack of lenses to try when my Z9 arrived, I have not tried any of my f-mount lenses on the FTZ2 except the 500pf.
I don't really feel like I'm missing anything but a small niche of image scenarios with the lenses I have now. I am more concerned about the wide end of the 100-400 when traveling more than anything else.
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Phoenix Arizona Craig
www.cjcphoto.net
"I miss the days when I was nostalgic."