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Forum: Troubleshooting and Beginner Help 07-20-2020, 10:54 PM  
Weird aperture issue with the 43mm Limited and a ZX-5N
Posted By dwchambers
Replies: 12
Views: 985
Indeed! I quite liked the combo and actually find the ZX-5N to be a good performer. I certainly get the criticisms it sometimes receives, but overall it's a nice shooting experience. It's light and the AF is snappy, plus it has a fair number of everyday-useful features. I do wish the VF were larger and brighter, and it'd be nice if it had mirror lockup, but otherwise it's quite a competent camera. And in my mind, it's pretty good looking in silver with the silver 43mm to match.

The ZX-60 is quite a different story obviously, but I think I'll end up giving it away to a friend who may be a first-time film shooter and I hope will enjoy it as a starter kit with the 28-90.

Excited to get a new, functional 43mm and then move on from there! I'm particularly intrigued by the SMC FA* 24mm, the SMC A 20mm, and the old SMC 30mm.
Forum: Troubleshooting and Beginner Help 07-20-2020, 03:59 PM  
Weird aperture issue with the 43mm Limited and a ZX-5N
Posted By dwchambers
Replies: 12
Views: 985
Just a quick update: I acquired a ZX-60 and a 28-90 to further test the 43mm. The 43mm failed to work correctly on the ZX-60 (the middle aperture values were still registering as A with the camera), and the 28-90 worked correctly on both the ZX-60 and the ZX-5N.

So it's definitely some issue internal to the lens. I've initiated a return and will be back looking for a working 43mm now!!

Thanks for talking this through, folks.
Forum: Troubleshooting and Beginner Help 07-20-2020, 11:04 AM  
Weird aperture issue with the 43mm Limited and a ZX-5N
Posted By dwchambers
Replies: 12
Views: 985
With the ZX-5N, Av mode only works with the lens aperture ring since there is no control on the body to set aperture. Moreover, the issue prevents me from shooting in manual because on these certain apertures, the camera is treating them as A (and therefore goes into Program or Tv mode).



Thank you, Ismael! I've checked on both the 43mm and the 28-80 and it doesn't seem like any contact is changing on the mount, but maybe there is a contact inside that is either activated or not depending on the aperture position?

In any case, it seems like the issue would be with the lens. I bought it with a warranty, so my best bet may be to just return it.
Forum: Troubleshooting and Beginner Help 07-19-2020, 08:34 PM  
Weird aperture issue with the 43mm Limited and a ZX-5N
Posted By dwchambers
Replies: 12
Views: 985
Hi all,

I am brand new to Pentax, but familiar with other systems and I almost exclusively shoot film. To get into Pentax, I just acquired the 43mm FA Limited and a ZX-5N, which came with the standard 28-80 FA kit lens.

I am having a weird issue that I cannot solve. For some reason, some aperture values on the 43mm are being treated as A. From f/4 to f/9.5, the camera treats the aperture as A and therefore operates on P mode (when the shutter dial is set to A; Tv otherwise). On f/11, the camera switches back and forth between Av and P. Then from f/1.9 to f/3.5 and f/16 to f/22, the camera reads those apertures correctly and will operate in Av or M modes. When the aperture is set to A, the camera treats it correctly as A.

The 28-80 zoom works correctly at all apertures.

I have cleaned the contacts both on the camera and lens. The mechanical aspects of the lens and camera seem correct, and the lens does stop down to shoot. But with this issue I just can't manually use apertures between f/4-11, which is really frustrating. Also, for what it's worth, when the camera is treating, say, f/8 as A and is therefore in P mode, the camera will select those middle apertures and will fire with those apertures selected in P.

It seems obviously to be a communication error, but it's weird to me that the issue only presents on those middle apertures.

Any ideas?

Thanks for the help!
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