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Pentax K-Mount to E Mount
  
 
johnahill
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p.1 #1 · p.1 #1 · Pentax K-Mount to E Mount


Can anyone recommend a good lens adapter for Pentax K Mount to E-Mount?
I have a 28mm 3.5 coming soon and need an adapter, usually go for fotodiox but in this case it's more expensive than the lens!



Aug 06, 2017 at 09:35 PM
rdeloe
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p.1 #2 · p.1 #2 · Pentax K-Mount to E Mount


K&F concept is my go to cheap Chinese adapter. PM me if you're interested in my nearly new copy! I don't have Sony anymore, but I have the adapter I bought for my Pentax lenses just before I sold my Sony gear


Aug 06, 2017 at 10:04 PM
johnahill
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p.1 #3 · p.1 #3 · Pentax K-Mount to E Mount


I'm looking at the K&F one on amazon it states:
Notice: This adapter will NOT fit on the Sony a7S, a7 II, a7S II, and a7R II.



Aug 07, 2017 at 11:43 AM
rdeloe
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p.1 #4 · p.1 #4 · Pentax K-Mount to E Mount


Interesting. I used it on an A7R (not the II). Here's the one I used:



johnahill wrote:
I'm looking at the K&F one on amazon it states:
Notice: This adapter will NOT fit on the Sony a7S, a7 II, a7S II, and a7R II.










Aug 07, 2017 at 04:08 PM
mcbroomf
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p.1 #5 · p.1 #5 · Pentax K-Mount to E Mount


I've been using them (both Copper and older versions) on A7r2 bodies with no issues (OM, Nik and EOS ... not PK)


Aug 09, 2017 at 02:31 PM
jstrawman
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p.1 #6 · p.1 #6 · Pentax K-Mount to E Mount


A Plain Jane Fotodox PK-NEX adapter has worked well for mee.


Aug 14, 2017 at 02:06 AM
Frogfish
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p.1 #7 · p.1 #7 · Pentax K-Mount to E Mount


I use the Leicaist from TechArt for all my adapters to M including PK-M. Excellent quality and zero play. Tight but not too tight. Around 20 each from memory. Used on both A7r and A7rii

I'd assume any to E are similar quality but I haven't bought any.



Aug 14, 2017 at 09:42 AM
tsdevine
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p.1 #8 · p.1 #8 · Pentax K-Mount to E Mount



If we're talking the original K mount 28/3.5 I've found that some adapters to be too thick to fully sharpen the corners. There is some towards the camera field curvature that can be a problem with some adapters (Rayqual, Kiwi...) This is one of my favorite lenses, and I've tested quite a few adapters with various copies. I use a Novoflex..which is way out of the price range you are looking for. I've also had luck with older style fotodiox, although they had a tendency to leak light (could be fixed relatively easy.) K&F was okay from what I remember.

It will come down to how well centered and within spec the adapter is with the lens you have. If you focus to the hard stop, and you are not happy with the corners at infinity, you probably have an adapter that is too thick. (Or a bum lens.)

There also seems to be some variance in the amount of field curvature with different copies, some flatter and some more pronounced.

Anyway, my ears always perk up when someone mentions a 28/3.5 Pentax...

-Tim

johnahill wrote:
Can anyone recommend a good lens adapter for Pentax K Mount to E-Mount?
I have a 28mm 3.5 coming soon and need an adapter, usually go for fotodiox but in this case it's more expensive than the lens!





Aug 16, 2017 at 06:23 PM
jcolwell
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p.1 #9 · p.1 #9 · Pentax K-Mount to E Mount


I'm using the SMC Pentax 28/3.5 on EOS, with a Kindai (Rayqual) adapter. The SMC Pentax 28/2 had a definite advantage at the edges, on the same adapter, but then I got the 28/3.5 to match the Vancouver's performance, after I had the lens adjusted to focus past infinity. Probably the field curvature that Tim mentioned.


Aug 17, 2017 at 01:04 AM
 

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johnahill
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p.1 #10 · p.1 #10 · Pentax K-Mount to E Mount


I've just returned my fotodiox, focussing at infinity didn't seem right almost like I needed a few more degrees of focussing but was already at the hard stop.

Have a voigtlander PK-Nex arriving soon. I'm hoping it was the adapter and not the lens



Aug 17, 2017 at 07:04 AM
johnahill
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p.1 #11 · p.1 #11 · Pentax K-Mount to E Mount


Tim, does the fotodiox one have a diaphram in it? Obviously wont need that for a manual PK lens but i'm not sure they do a plain one


Aug 17, 2017 at 07:05 AM
tsdevine
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p.1 #12 · p.1 #12 · Pentax K-Mount to E Mount



Note my post above, that is a common problem I've found with some adapters. Don't give up, there are adapters out that that should let you get fully to infinity.

-Tim



Aug 17, 2017 at 12:13 PM
tsdevine
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p.1 #13 · p.1 #13 · Pentax K-Mount to E Mount



No diaphragm, just some beveling inside I believe. Here's what it looks like, except mine has a tab to dismount the lens.

https://2.img-dpreview.com/files/p/TS560x560~forums/50395811/e5fbb846ddf447599cac8e5d4869b28b

-Tim

johnahill wrote:
Tim, does the fotodiox one have a diaphram in it? Obviously wont need that for a manual PK lens but i'm not sure they do a plain one





Aug 17, 2017 at 01:06 PM
johnahill
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p.1 #14 · p.1 #14 · Pentax K-Mount to E Mount


Sorry Tim, my bad. I meant the Novoflex



Aug 17, 2017 at 01:14 PM
tsdevine
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p.1 #15 · p.1 #15 · Pentax K-Mount to E Mount


The Novoflex does not have a diaphragm either, it does have a nifty little ring to open the lens aperture to wide open. Then you turn it the other way and it goes down to whatever aperture you have selected on the lens.

-Tim



Aug 17, 2017 at 04:10 PM
johnahill
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p.1 #16 · p.1 #16 · Pentax K-Mount to E Mount


Cheers Tim


Aug 17, 2017 at 10:06 PM
johnahill
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p.1 #17 · p.1 #17 · Pentax K-Mount to E Mount


PK 28 3.5 seems dandy on the Voigtlander adapter
Love the fact that it takes same filters as Loxia 21, very handy

















Aug 18, 2017 at 10:32 AM
johnahill
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p.1 #18 · p.1 #18 · Pentax K-Mount to E Mount


those are 100% btw and no processing


Aug 18, 2017 at 10:32 AM







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