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Continuing the wide angle question

Sdeve
Posted 05/10/2022 - 12:30 Link
I recently purchased, as a bit of a gamble, a Sirius 18-28mm K A lens on the bay. Well, the gamble didn't pay off. The lens was, to put it bluntly, crap. Out of focus, dodgy exposure, and generally unfit for purpose. On informing the seller of this, prior to returning it for a refund, I received the following message.

I have just seen the return request. You are of course welcome to return the lens, however this lens is not designed for use with a Digital SLR. Whilst it will fit, there are often issues with compatibility.

Now I'm sure that the comment was well meant, but I doubt it's accuracy in respect of Pentax lenses, including older ones made for 35mm film cameras. It got me to wondering if anyone knows of a Pentax K fit lens made for 35mm cameras that is not compatible with Pentax DSLRs, in particular the K1? I have accumulated more of such lenses than might be sensible over the years, and never had any problem with any of them, save a couple where an apparently oversized flange on the inside prevented attachment, which is not the issue here anyway.
Pwynnej
Posted 05/10/2022 - 13:11 - Helpful Comment Link
Any KA fit lens should work perfectly well on an *ist/K-series/Samsung GX DSLR. Perhaps the dealer has a very odd/poor way of admitting that any flaws in the lens will be magnified on a DSLR (film was actually more forgiving - who grain peeped?).
Z-1p, K-1, P50
F50 1.7. SMC-FAs 24, 35, 50 1.4, 85, 135. HD-FA15-30, DFA24-70, D-FA*70-200. The SMC-FA Limited Trinity.
Metz 45 CL-4, AF500FTZ. AF540FGZ.
Some Mamiya and some Nikon
JohnX
Posted 05/10/2022 - 17:28 Link
Could be a clumsy way of saying it's not optimised for digital.
JAK
Posted 05/10/2022 - 19:02 - Helpful Comment Link
You aren't the first to say that! A post from 2010 :

https://www.pentaxuser.com/forum/topic/the-sub--50-lens-guide-20990#comm227531
John K
pschlute
Posted 05/10/2022 - 19:06 Link
Sdeve wrote:
I recently purchased, as a bit of a gamble, a Sirius 18-28mm K A lens on the bay. Well, the gamble didn't pay off. The lens was, to put it bluntly, crap. Out of focus, dodgy exposure, and generally unfit for purpose.

Can you detail how you were using it on the K-1.....what exposure mode, what aperture setting on the lens ?

How can it be out of focus ? It is a manual focus lens, or am I missing something.
Jonathan-Mac
Posted 06/10/2022 - 09:03 Link
It's a re-branded Samyang lens from back when Samyang made the worst of the worst. I tried one out on my K200D many years ago and it was horrible.

Compatibility is not the problem, the problem is that it's an extremely poor quality lens.
Pentax hybrid user - Digital K3, film 645 and 35mm SLR and Pentax (&other) lenses adapted to Fuji X and Panasonic L digital
Fan of DA limited and old manual lenses
Sdeve
Posted 06/10/2022 - 16:39 Link
pschlute wrote:
Sdeve wrote:
I recently purchased, as a bit of a gamble, a Sirius 18-28mm K A lens on the bay. Well, the gamble didn't pay off. The lens was, to put it bluntly, crap. Out of focus, dodgy exposure, and generally unfit for purpose.

Can you detail how you were using it on the K-1.....what exposure mode, what aperture setting on the lens ?

How can it be out of focus ? It is a manual focus lens, or am I missing something.

On reflection (!) I should have said 'blurred' rather than 'out of focus'.
reso
Posted 09/10/2022 - 11:18 Link
bought a mint sirus ka 135 f 2,8 would not mount on my k5 had the r pin did not want to strip so sent it back for a refund now have a pentax A 135
What a great lens
k5iis k3ii sigma ex 15-30 tamron 17-50 pentax faj 18-35 pentax da 18-135 tokina 20-35 tokina 28-70 atx pro pentax dfa 100 wr
pentax da*50-135 pentax da*60-250 sigma af 400mm
Pentax af aw 1.4 rear converter and a flash
Edited by reso: 09/10/2022 - 11:19

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