Forgot Password
Pentax Camera Forums Home
 

Reply
Show Printable Version Search this Thread
07-14-2016, 09:16 AM   #1
Site Supporter




Join Date: May 2015
Location: Hampshire
Photos: Albums
Posts: 400
Need help with assessing this old M42 Sigma lens

I bought a couple of M42 lenses at auction and one of them does not appear to have any info on the net.
It is a SIGMA HIGH-SPEED 80-200mm (constant?) F3.5 one touch with "macro" 1:4.
The 200mm end is nearest to the camera.
No stop down switch.
8 blades. 62mm filter thread.
Too many screws around the mount!
Very soft at F3.5.


I have read that the Sigma high-speed zooms were nothing special but if this is a constant 3.5, maybe this one is.
Does anyone have experience of this lens?


I would like to sleeve the stop down pin to enable use but am put off by the number of screws around and on the mount.
Is this an example of a Sigma version of an interchangeable mount?
There are 5 screws around the mount, 3 in close proximity to each other and 2 more at 90 degs to those 3 and 180 degs to each other.
4 screws in the face of the mount, 3 x head and one slotted.


Thank you to anybody that can help.

Attached Images
View Picture EXIF
PENTAX K-5  Photo 
View Picture EXIF
PENTAX K-5  Photo 
View Picture EXIF
PENTAX K-5  Photo 
View Picture EXIF
PENTAX K-5  Photo 
07-14-2016, 09:36 AM   #2
Pentaxian




Join Date: Oct 2011
Location: Savannah, GA
Posts: 4,997
Constant-speed zooms are not necessarily higher quality than a variable-speed zoom -- especially an old third-party zoom. It is harder to make a good constant-speed zoom. So soft wide-open is probably to be expected, and is what I've found almost universally among older "fast" third-party lenses. But many of these old things are surprisingly good when you stop them down a bit. (Most of the old Vivitar Series 1 non-macro prime lenses that were a stop or half-stop faster than usual were like this -- they tend to be very soft wide-open but pretty good stopped down.)
07-14-2016, 09:37 AM   #3
Site Supporter
boriscleto's Avatar

Join Date: Dec 2009
Location: Liverpool, NY
Photos: Gallery
Posts: 12,677
Keep in mind that Sigma was know as Stigma in those days...

Sigma did have an interchangeable mount at one point, the YS mount, but this is not one of them. I'm pretty sure they continued with bolt-on lens mounts for years after they abandoned the YS mount.

YS Interchangeable Adapter Mounts, Y-S lens mount

Last edited by boriscleto; 07-14-2016 at 09:44 AM.
07-14-2016, 09:38 AM   #4
Pentaxian
D1N0's Avatar

Join Date: May 2012
Location: ---
Photos: Gallery
Posts: 4,107
Try to jam the aperture pin in the stopped down position. Then the aperture will close

07-14-2016, 09:43 AM   #5
Pentaxian




Join Date: Oct 2011
Location: Savannah, GA
Posts: 4,997
No A/M switch? Bit weird for the vintage. I'd just superglue the pin on such a lens, although some people warn against it I've done it lots of times without issue. (Just do in well-ventilated area -- once dry it is fine.)
07-14-2016, 10:08 AM   #6
Pentaxian
dcshooter's Avatar

Join Date: Jan 2011
Location: Washington DC
Photos: Gallery | Albums
Posts: 4,411
Those three JIS screws in the mount will probably be enough to get the mount off.

The three small flat heads on the retaining ring look suspiciously like two intended to hold on the "Lobster Claw" (labeled "Meter Coupling Shoe below)for a Nikon pre-AI or AI mount, and the third, along with the other two widely spaced ones, hold the retaining ring in place. That suggests everything behind the retaining ring should pop out separately. The slotted screw is probably just a hard stop for the aperture arm.



Once off, you can put a stop on the pin from the inside, which is more easily reversible than the glue approach.
07-14-2016, 10:19 AM   #7
Site Supporter




Join Date: Jun 2011
Location: Texas
Photos: Gallery
Posts: 1,133
Back in my day, before through the lens metering, zooms were constant speed in order to meter accurately. They also weren't very good. So if this dates to that period...
Back then catalogs had "lenses" and "zoom lenses" as there were so few zooms they didn't need to say "prime" lens.
07-14-2016, 10:45 AM   #8
Pentaxian
Not a Number's Avatar

Join Date: Mar 2012
Location: Venice, CA
Posts: 4,112
According to the article linked in boriscleto's post the Y-S system is compatible with T-mount. So you could us a T-mount adapter in place of a Y-S adapter with loss of automation (no linkage). Or a T-mount lens on a Y-S adapter (no linkages).

Are you sure this is a M42 thread and not a T-mount/Y-S thread on this lens?

07-14-2016, 11:25 AM   #9
Pentaxian




Join Date: Oct 2011
Location: Savannah, GA
Posts: 4,997
QuoteOriginally posted by Not a Number Quote
According to the article linked in boriscleto's post the Y-S system is compatible with T-mount. So you could us a T-mount adapter in place of a Y-S adapter with loss of automation (no linkage). Or a T-mount lens on a Y-S adapter (no linkages).

Are you sure this is a M42 thread and not a T-mount/Y-S thread on this lens?
I don't think a T-mount would have an aperture pin like that -- gotta be an m42.
07-14-2016, 11:41 AM   #10
Site Supporter
boriscleto's Avatar

Join Date: Dec 2009
Location: Liverpool, NY
Photos: Gallery
Posts: 12,677
QuoteOriginally posted by Not a Number Quote
According to the article linked in boriscleto's post the Y-S system is compatible with T-mount. So you could us a T-mount adapter in place of a Y-S adapter with loss of automation (no linkage). Or a T-mount lens on a Y-S adapter (no linkages).

Are you sure this is a M42 thread and not a T-mount/Y-S thread on this lens?
Sigma continued to use a bolted-on lens mount long after they stopped with the Y-S. I have a K-mount Sigma XQ 28mm that has a very clunky looking lens mount...

Name:  _IMG1214-2.jpg
Views: 175
Size:  254.5 KB
07-14-2016, 11:59 AM   #11
Pentaxian
dcshooter's Avatar

Join Date: Jan 2011
Location: Washington DC
Photos: Gallery | Albums
Posts: 4,411
Lookee what I found. Definitely the lobster claw attachment, which means everything behind it likely detaches as one piece:
07-14-2016, 12:34 PM   #12
Site Supporter




Join Date: May 2015
Location: Hampshire
Photos: Albums
Posts: 400
Original Poster
Many thanks to all you kind people that have posted.


I shall pop the mount off sometime and sleeve the pin and.......not be too surprised if it turns out to be a bit of a duffer image wise.
I have an old Sigma mini wide 28mm F2.8 that I quite like (K mount) so maybe this will be likeable too.
07-15-2016, 12:20 PM   #13
Site Supporter




Join Date: May 2015
Location: Hampshire
Photos: Albums
Posts: 400
Original Poster
Update on this lens.
I took out the 3 retaining screws on the mount face and removed the plate containing the stop down pin.
Unfortunately the ball bearing aperture click maker and a tiny brass tube fell off.
I have no idea where this brass tube goes but re-assembled the lens with a tiny tube cut from a cotton bud (Q tip?) sleeved over the pin.
Result....lens stops down, seems to work fine....but this tiny brass tube is bugging me. It must go somewhere!


Today was overcast and I did not take many images. It is soft wide open and improves down a couple of stops then sharpens up. High contrast (white lettering) shows some green fringing wide open but this goes as it stops down. I have some not as good manual zooms ( one is called a Formula 1, great brand name!) and maybe a couple of better ones. The better ones (Tamron SPs) have zoom creep which this is not yet suffering from and purple fringing not green.
I shall try it some more in the sun...when we get some. First impressions are that it is not a bad lens....stopped down, and a reasonably fast aperture for it's length.


Thank yous again to all who posted replies.
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!
camera, f3.5, high-speed, interchangebale, lens, m42, mount, pentax help, photography, screws, sigma, stop, troubleshooting
Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Need help with old lenses for new K-S1 ccarlitos2 Troubleshooting and Beginner Help 2 12-29-2015 08:10 PM
Need help troubleshooting old A-type lens mgvh Pentax SLR Lens Discussion 13 06-08-2015 05:32 PM
Need help on choosing this lens 15mm or 14mm scomatic Pentax SLR Lens Discussion 12 04-20-2015 07:45 PM
Need help! Is this dust/scratch/sensor/lens? UserAccessDenied Pentax SLR Lens Discussion 11 02-16-2015 07:27 PM
Need some help fixing this photo with Gimp nono Digital Processing, Software, and Printing 5 09-10-2014 12:43 PM



All times are GMT -7. The time now is 07:52 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