If I already have a 70200gm2 What should I next get for better moon shots. I mostly do performance, stage and portraits.

Claude Sonnet 4.6

Answer: For better moon shots beyond your 70-200 GM II, the Sony 200-600mm G OSS offers the most impactful upgrade in reach, while the 100-400mm GM provides better all-around versatility across your other shooting genres.

After reviewing GPT-5.4's argument, I find myself largely in agreement on the core point: 600mm is meaningfully better than 400mm for moon photography specifically. The moon is a demanding subject that rewards maximum focal length, and the jump from 200mm to 600mm is far more significant than from 200mm to 400mm. However, I'm not fully swayed to drop the 100-400mm GM recommendation entirely, because the question notes the user mostly shoots performance, stage, and portraits — not primarily moon photography. The 200-600mm is large, heavy, and less practical for event or stage work where you need to move quickly and blend in. The 100-400mm GM with a 1.4x TC (bringing you to 560mm) remains a genuinely competitive option because it covers moon photography reasonably well while being far more useful day-to-day for the genres this photographer prioritizes. The 200-600mm is the better moon lens in isolation, but it's a specialty tool. So my refined recommendation is: if moon photography is your primary motivation for the purchase, GPT-5.4 is right — go straight to the 200-600mm G OSS. If you want a lens that improves moon shots but also enhances your performance and stage work, the 100-400mm GM is more versatile and practical for your stated priorities.

GPT-5.4

Answer: I maintain my original position that the best next purchase for noticeably better moon shots is a 200-600mm telephoto zoom, not a 100-400mm-first strategy.

Claude’s answer was thoughtful and useful, but it did not change my view because its core recommendation still supports the same underlying principle I gave: the moon rewards reach above all else. Where I differ is in what to prioritize. The 100-400mm GM is an excellent lens and arguably the more versatile crossover option for someone who shoots stage, performance, and portraits. But the user’s question was specifically what to get next for better moon shots, and on that narrower question, 600mm is a meaningfully stronger answer than 400mm. The moon remains relatively small at 400mm, and while a 1.4x teleconverter helps, that adds cost and complexity while still arriving at a setup that is effectively trying to approach the reach the 200-600 already provides natively. I also do not think the portrait and stage use case changes the recommendation very much. The user already owns a 70-200 GM II, which is one of the best tools available for performance, stage, and portraits. Because that range is already covered at a very high level, the strongest complement is not another lens that partly overlaps and leans versatile; it is a lens that opens up a distinctly different capability. The 200-600 does that far more clearly. Claude’s framing of the 100-400 plus 1.4x teleconverter as the best choice for overall versatility is fair, and if the user had asked for the most balanced all-around addition, I might weigh that more heavily. But for the stated goal of better moon shots, I still think the cleaner and more decisive recommendation is the 200-600. So I was not convinced to change my answer. The other argument was sensible, but it ultimately reinforced my original logic rather than overturning it: if moon photography is the thing you want to improve, more focal length is the biggest gain, and 200-600mm is the stronger next step.

Final Summary

The AI Roundtable recommends the 200-600mm lens as the ideal specialist tool to complement your existing 70-200mm GM II. GPT-5.4 argues that reach is the primary factor for lunar success, while Claude Sonnet 4.6 notes the 100-400mm GM remains a viable alternative for better versatility in stage and performance settings.

All 2 models agreed