Screen for bright lenses: SA-23 or new 60s?

[Andre Langevin]

I already know what Pentax say in their tables, but, from your 
experience, is the SA-23 screen a better choice than the 60 series 
for low light photography with bright lenses (mostly K50/1.4, 
A85/1.4, 135/1.8 and occasionnally K28/2, K35/2, 200/2.5)?

Thanks,

Andre
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