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The "Missing Link" to Your 55mm Backfocus: SV226 vs. SV226P Explained!
Trying to combine the M42-threaded SC571CC with the beastly M54-threaded SV238 OAG? You might have noticed a standard M42 filter drawer won’t fit, and an M54 drawer ruins your backfocus. The solution isn't magic—it’s the "P"!
The Technical Nightmare: M42 vs. M54 Compatibility
Many users get stuck in a "64mm trap" by adding too many adapters. Here’s why a standard setup fails (swipe through the photos for a visual deep-dive):
Standard SV226 M42: Zero flexure connection points to the OAG (No holes!). It simply can’t attach.
Standard SV226 M54: Native M54 threads can’t screw into the M42 camera (SC571CC). Adding an adapter blows out your 55mm requirement.
The Pro Solution: The SV226P (M42 with Holes)
The SV226P (included in our SC571CC Kit) is specifically engineered with a "Hybrid Design" to solve this exact M42-to-M54 headache:
Camera Side: Native M42 Female Thread—screws directly into the SC571CC. NO adapters. Telescope/OAG Side: Specifically drilled with a flange ring (Holes) to create a rigid, non-flexing connection with the M54 SV238 OAG.The result? A rigid, vignetting-free imaging train at exactly 55mm. Done! 
Check out the SC571CC Kit to get the correct SV226P drawer:
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