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Good quality 24 or 28mm lens in M42 with small front element
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PostPosted: Fri Feb 20, 2015 2:15 pm    Post subject: Good quality 24 or 28mm lens in M42 with small front element Reply with quote
Hi folks

I have a 0.7x wide angle converter, a big pro thing with many aspherical elements and the latest coatings. It works beautifully on my APS-C NEX-3 with my Konica 24 and 28mm Hexanons but trying it on my Sony a850 with a 28mm lens, it vignettes a bit. The only 28mm lenses I have for the a850 are the Minolta AF 2.8/28 and the Mamiya-Sekor 2.8/28. I figure a lens with a smaller front element would probably avoid this issue.

Any thoughts?


PostPosted: Fri Feb 20, 2015 2:25 pm    Post subject: Reply with quote
Here's an example of what I mean by small front element, Pentax-M 2.8/28:



However, Pk to A mount isn't possible so the lens would need hacking, I'd rather avoid that, hence I asked about M42 fit options.


PostPosted: Fri Feb 20, 2015 2:30 pm    Post subject: Reply with quote
-OM lenses can be fitted on that camera?


PostPosted: Fri Feb 20, 2015 2:47 pm    Post subject: Reply with quote
Sadly not, would need a mount swap.


PostPosted: Fri Feb 20, 2015 3:39 pm    Post subject: Reply with quote
Thinking out loud...not sure I've tried any of these on full frame though...

Tamron AD2 28/2.5 or 24/2.5 (think the 28mm is the better of the two).

Hoya 24/2.8

Cosina/Miranda 24/2.8


PostPosted: Fri Feb 20, 2015 3:53 pm    Post subject: Reply with quote
Clubman/Ensinor 24mm or 28mm.


PostPosted: Fri Feb 20, 2015 4:52 pm    Post subject: Reply with quote
I am not sure I understand. Why is Pentax K to Sony A not possible? There are adapters.


PostPosted: Fri Feb 20, 2015 4:53 pm    Post subject: Reply with quote
Which wide angle converter are you using ?? please let us know.
And can you post some photos taken with the said adapter.


PostPosted: Fri Feb 20, 2015 4:58 pm    Post subject: Reply with quote
I am not using anything. I don't have an A mount camera. I wasn't trying to say use x. I was asking what the issues would be with the PK-A adapters I have seen advertised. Seeking information not giving advice.


PostPosted: Fri Feb 20, 2015 5:06 pm    Post subject: Reply with quote
The pentax 28 2.8 II is a nice lens. It is with the lenses of Pentax A 28 2.8. Another nice lens is the Sigma mini Wide II 24 2.8...


PostPosted: Fri Feb 20, 2015 8:25 pm    Post subject: Reply with quote
newst wrote:
I am not using anything. I don't have an A mount camera. I wasn't trying to say use x. I was asking what the issues would be with the PK-A adapters I have seen advertised. Seeking information not giving advice.


There are adapters for Sony e mount but not a mount as far as I am aware.


PostPosted: Fri Feb 20, 2015 8:36 pm    Post subject: What about these? Reply with quote
http://www.ebay.com/itm/Macro-Confirm-Pentax-K-PK-Mount-Lens-to-Sony-Alpha-A-Minolta-AF-Adapter-A900-A99-/151188762137?pt=LH_DefaultDomain_0&hash=item23338d6e19

http://www.ebay.com/itm/AF-confirm-Adapter-for-Pentax-PK-K-Lens-to-MINOLTA-SONY-ALPHA-MA-mount-A77-A99-/180600383319?pt=LH_DefaultDomain_0&hash=item2a0c9f2757

http://www.ebay.com/itm/Pentax-K-PK-Lens-to-SONY-Alpha-ADAPTER-MINOLTA-MA-MOUNT-A99-A580-A77-II-A65-A900-/400063987757?pt=LH_DefaultDomain_0&hash=item5d25ac002d


PostPosted: Fri Feb 20, 2015 8:49 pm    Post subject: Reply with quote
First of the three is without glass, macro only; both other ones are with glass, so infinity possible, but optical quality is lesser and the lens works as a light teleconverter (mostly 1.2x).
Not a very fine solution IMHO.
So PK isn't the mount to search for.
Sigma miniwide II (28mm) and superwide (24mm) in M42 might be an idea, just like the Tamron 28mm 2.5 adaptall-2.


PostPosted: Fri Feb 20, 2015 8:59 pm    Post subject: Reply with quote
Yup,adapters with glass are out.

The Tamron ad2 28 looks promising, front element is particularly small.

Thanks for the suggestions guys.


PostPosted: Fri Feb 20, 2015 9:04 pm    Post subject: Reply with quote
In M42 mount my favourite 24mm and 28mm lenses both have a fairly small front element: EBC Fujinon-SW 24mm f/2.8 and Vivitar Auto Wide Angle 28mm f/2.8 (28xx serial).

Last edited by Arkku on Sat Feb 21, 2015 6:12 am; edited 1 time in total


PostPosted: Fri Feb 20, 2015 9:28 pm    Post subject: Reply with quote
Arkku wrote:
In M42 mount my favourite 24mm and 28mm lenses both have a fairy small front element: EBC Fujinon-SW 24mm f/2.8 and Vivitar Auto Wide Angle 28mm f/2.8 (28xx serial).


+1 on the Komine Vivitar 28/2.8...good lens Smile


PostPosted: Fri Feb 20, 2015 9:41 pm    Post subject: Reply with quote
I actually have that Komine, but in the X-Fujinar guise so not usable on the a850.


PostPosted: Sat Feb 21, 2015 6:14 am    Post subject: Reply with quote
If you liked the 28mm f/3.5 Fujinon, the 24mm may be worth considering, but admittedly it's hard to find at a decent price.

(Meanwhile the “fairy small” in my previous post was a typo of “fairly small”, not implying that the front elements are faery-sized… =)


PostPosted: Sat Feb 21, 2015 12:29 pm    Post subject: Reply with quote
M42 are OK but k mount are not? Tried a Nikon to Sony A mount instead?


PostPosted: Sat Feb 21, 2015 1:37 pm    Post subject: Reply with quote
tromboads wrote:
M42 are OK but k mount are not? Tried a Nikon to Sony A mount instead?


Neither K-mount or Nikon F-mount can be adapted to A-mount mechanically while maintaining infinity focus.


PostPosted: Sun Feb 22, 2015 3:00 am    Post subject: Reply with quote
How odd. Given the register distance for m42 and k mount sare the same I would have thought it be easy.


PostPosted: Sun Feb 22, 2015 5:45 am    Post subject: Reply with quote
Before switching to a Sony a7, i was using a Minolta Dynax 7D..

I've tried :
1976 Kiron M42 VIVITAR 2.5/28 Auto-Wide - ∅67 - 6 blades - A/M switch - MFD 30cm - not bad - to big
1982 Kiron M42 VIVITAR 2.5/28 Auto-Wide - ∅62 - 6 blades - A/M switch - MFD 30cm - not bad - not the smallest front lens
1979 M42 HOYA Wide-Auto HMC ∅52 6 blades MFD 30cm - nothing spectacular - had to "make it manual" - not small
1967 M42 SCHNEIDER-KREUZNACH Curtagon 4/28 - ∅49 - 5 blades - A/M switch - MFD 25cm - Lovely, a great lens...
EBC FUJINON-SW 3.5/28 - ∅49 - 5 blades - MFD 40cm - Lovely lens - You'll need to grind the tab and make it manual



Last edited by Mir on Sun Feb 22, 2015 3:42 pm; edited 1 time in total


PostPosted: Sun Feb 22, 2015 9:04 am    Post subject: Reply with quote
tromboads wrote:
How odd. Given the register distance for m42 and k mount sare the same I would have thought it be easy.


The M42 threads fit inside the A-mount opening, the K-mount and F-mount bayonets with larger diameter do not. Consider that the K-mount was designed to accept M42 mount lenses with an adapter despite having the same register: the K-mount opening has such a large diameter that the M42 adapter fits completely inside it. The A-mount diameter is not designed to be large enough for a K-mount adapter to fit inside, and the depth of the K-mount bayonet is greater than the difference in register distances -> adapter acts as an extension tube by placing the K-mount bayonet “on top of” the A-mount.
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