Sounds to me as if the aperture is stopped down. It should normally be fully open except during an exposure, to allow viewing at full aperture. Whether it is stuck or whether you have just set the stop-down lock manually I cannot tell from here. If you turn the aperture ring to the fully open end and it is still shut down, then it is stuck. This typically happens when the blades get a bit of oil on them. It can be fixed, but it isn't really a DIY job.
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