Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
05-08-2012, 12:29 PM   #1
New Member




Join Date: Aug 2011
Location: Regina, Saskatchewan
Posts: 11
Looking for a wide angle lens that might not even exist...

Hi all,

So I've been working on an extreme macro setup (~100mm of extension, 200-500mm Tamron zoom, with a reverse mounted lens) and I'm not happy with the reverse mounted lens I'm using. I'm currently using my 18-55mm kit lens at 18mm wide open. I think 18mm reverse wide open is causing some softness and perspective distortion issues. I also thing that since the lens is made of plastic and mounted from its filter thread its causing some misalignment of the optics.

To combat these problems, I'm looking for a zoom or a prime lens in the 20 to 28 range that has an aperture ring and is made of metal. Does anybody know of any older generation lenses that might suit this need? Or better yet, something I'm overlooking in this setup that might be causing me some problems?

Thanks!

05-08-2012, 12:53 PM   #2
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,400
this caught my eye because of th ezoom you are hooking this onto,

Are you using the F5.6 or F6.9 version of the 200-500 lens.

Either way, this is an absolute monster.

As for a 20-28mm manual aperture lens, i.e. one that is open to the aperture setting, there are a ton. the issue will be getting the reversing ring, specifically if you are using the F5.6 version of the lens with it's 95mm front element.

I think you might be just as happy with a smaller lens as the normal mounted lens, but that's kjust my $0.02
05-08-2012, 12:58 PM   #3
Pentaxian




Join Date: Oct 2011
Location: Savannah, GA
Posts: 5,002
Sigma Super-Wide II (24mm w/ 52mm filter threads) might work. I have one, but never tried it reversed. But it is metal, and pretty sharp for normal usage.
05-08-2012, 01:04 PM   #4
New Member




Join Date: Aug 2011
Location: Regina, Saskatchewan
Posts: 11
Original Poster
Lowell,
I'm using the F6.9, it's got an 82mm filter ring - and I bought a 82mm to 52mm from eBay and it works pretty well. That could be another source of error, if the 52mm isn't EXACTLY in the middle of the 82mm it would definitely cause some scattering. And like you say, I might as well just be happy with the smaller lens and it might not be possible to solve the issues I'm seeing.

vonBaloney,
I'll have to keep an eye out on the market place for one of these, Thanks!

The focal length of the reversed lens strongly affects the magnification, so the smaller focal length the better. But I'm not sure at what point the perspective distortion really takes hold and makes the magnification pointless. I'll do some tests with my 18-55 perhaps and zoom in 1mm increments from 18 to 30mm and see what I like best.

05-08-2012, 02:17 PM   #5
New Member




Join Date: Mar 2012
Location: Brooklyn
Photos: Albums
Posts: 13
QuoteOriginally posted by vonBaloney Quote
Sigma Super-Wide II (24mm w/ 52mm filter threads) might work. I have one, but never tried it reversed. But it is metal, and pretty sharp for normal usage.
It doesn't seem like you're trying to cheap out, but a cheaper option (albeit, slightly less wide) is the Sigma mini-wide 28mm. Like the super-wide, it also has metal construction and a 52mm thread. I've never mounted mine reverse, but it's been really solid for normal use.
05-08-2012, 02:45 PM   #6
Veteran Member
RioRico's Avatar

Join Date: Jun 2008
Location: Limbo, California
Posts: 11,264
Whew, that's extreme macro! As mentioned, are many old 24-25-28-29-30mm MF primes available. You needn't limit yourself to PK-mount glass either, since it will be reversed. I'll suggest that you look for a T-mount lens, which will give you an extra 10mm of working distance. I had a T-mount Sigma-made 24/2.8 branded as Super-Albinar; I sold it as a duplicate. Its M42 near-clone (badged as Sigma) is quite decent when I reverse it on my FA100-300.
05-08-2012, 02:49 PM   #7
Pentaxian




Join Date: Oct 2011
Location: Savannah, GA
Posts: 5,002
If you're ONLY going to reverse it and don't care about ever actually mounting it normally, you can look at lenses of any mount. And old pre-AI 24mm Nikkor might be good -- you can get 'em for about $80 last I checked. If 28mm is ok, there are a gazillion varieties of old Vivitar 28s (and a few 24s). You can find these for as low as $10, especially for a "dead" system (Konica mount anyone?). Whereas the Sigma 24mm in KA makes an excellent lens either way...
05-08-2012, 03:45 PM   #8
Veteran Member




Join Date: Jan 2009
Location: Brisbane
Photos: Gallery
Posts: 1,421
I have successfully used a reverse mounted (direct to body) Pentax SMC "M" 28mm f2.8 lens for macro work

Has aperture ring, very sharp as a regular 28mm lens, worked well for me

It is a 49mm filter thread BTW

05-08-2012, 04:29 PM   #9
Pentaxian
Marc Sabatella's Avatar

Join Date: Sep 2006
Location: Denver, CO
Photos: Gallery
Posts: 10,686
QuoteOriginally posted by athlantar Quote
To combat these problems, I'm looking for a zoom or a prime lens in the 20 to 28 range that has an aperture ring and is made of metal
Might not even exist? On the contrary, you'd be hard pressed to find an older manual 20-28mm lens that did *mot* fit this description.
05-08-2012, 06:37 PM   #10
New Member




Join Date: Aug 2011
Location: Regina, Saskatchewan
Posts: 11
Original Poster
I've kept my eye on local kijiji and used*.com sites as well as the marketplace here (I'm abit hesitant to buy lenses from eBay) for lenses of any make and havent quite found what I'm looking for. But as I mentioned before, I don't know exactly what focal range I really want or if it'll even fix things. Maybe I'll make a post in the photographic techniques section to see if anyone can confirm my calculations on what kind of magnification I'm expecting (and how the focal length of the reverse mounted lens affects it).

If I end up having to buy a lens that isn't too cheap I'd like to have it mount on my K-r so I could use it regularly aswell.

Any suggestions on sites that are reputable (like our marketplace) to buy directly from a person?
05-08-2012, 06:53 PM   #11
Pentaxian
Lowell Goudge's Avatar

Join Date: Jan 2007
Location: Toronto
Photos: Gallery | Albums
Posts: 15,400
QuoteOriginally posted by Lacrosse321 Quote
It doesn't seem like you're trying to cheap out, but a cheaper option (albeit, slightly less wide) is the Sigma mini-wide 28mm. Like the super-wide, it also has metal construction and a 52mm thread. I've never mounted mine reverse, but it's been really solid for normal use.
Is the The sigma mini wide a mini wide II if so forget it. Really bad CA
05-09-2012, 01:00 AM   #12
Pentaxian
hoanpham's Avatar

Join Date: Nov 2009
Location: Strand
Photos: Gallery | Albums
Posts: 1,366
Many wide lenses out there.

Reverse lens:
pentax 20/4, pentax A20/2.8, olympus 21/3.5, nikkor 20/4, canon fd 20/2.8, Tokina17... ?

Tele:
Pentax M*/A* 300/4, Tamron adaptall 300/2.8, converted nikkor 400/5.6 ED-IF ?
05-09-2012, 11:27 AM   #13
Pentaxian
Wheatfield's Avatar

Join Date: Apr 2008
Location: The wheatfields of Canada
Posts: 10,157
PM sent
05-09-2012, 12:13 PM   #14
Site Supporter
Douglas_of_Sweden's Avatar

Join Date: Apr 2008
Location: Stockholm
Photos: Gallery
Posts: 3,353
The Konica Hexanon AR 28mm f3.5 is very good for this job. Also it is worth almost nothing because of the short registration distance of the AR mount and because they made a mountain of it.
But you have thousands of options fit for this task.
Reply

Bookmarks
  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
18mm, angle lens, k-mount, lens, pentax lens, reverse, setup, slr lens
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Wide-Angle Lens AdamfromCanada Pentax SLR Lens Discussion 25 06-22-2012 09:23 PM
Best wide angle lens (between 24 and 28) Domenico Pentax SLR Lens Discussion 10 05-22-2011 01:48 PM
Looking for K-x wide angle lens? tonytooth Pentax SLR Lens Discussion 16 03-12-2011 03:22 PM
Best wide angle lens A.M.92 Pentax SLR Lens Discussion 8 06-29-2010 02:21 PM



All times are GMT -7. The time now is 05:52 AM. | See also: NikonForums.com, CanonForums.com part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
register
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]
Top