Vivitar Series-1 4-Element 2x Tele Converter, Pentax Autofocus Mount


About Vivitar 2x

Summary of Customer Reviews

Customers most agreed on the following attributes:
Lightweight (16),Easy to use (12),Durable (7),Improves function (5),Easily interchangeable (5),Fast / accurate auto-focus (3),Consistent output (3)
Not functional (4)
Best Uses:
Wildlife (9),Macro photography (6),Travel (5),Landscape/scenery (5),Everyday use (4),Sports/action (4),Wildlife photos (4)
Reviewer Profile:
Photo enthusiast (22),Semi-pro photographer (3)

Vivitar 2x Features

  • Series 1 4-Elements 2x Tele Converter
  • High Definition
  • Multicoated Optical Glass
  • Increases Focal Length by 2x
  • Supresses Aberration
  • Anti-Reflection Coating
  • Lifetime Warranty

Vivitar 2x Reviews

Review Snapshot®


(based on 28 reviews)


of respondents would recommend this to a friend.

Ratings Distribution

  • 5 Stars



  • 4 Stars



  • 3 Stars



  • 2 Stars



  • 1 Stars



Most Liked Positive Review


Finally, a tele converter for Pentax

I have been Having trouble finding a tele converter in a Pentax mount. Then I discovered the Vivitar 2X Tele converter. I am quite pleased with it. I used it along with my Tamron LD Di 70 - 300 tele-zoom lens when the Shuttle Discovery flew over Washington DC on it's way to the Smithsonian. The auto focus worked flawlessly and I got some great shots. If you are looking for a quality 2X Tele converter for your Pentax at a good price, this is it.

Reviewed by 28 customers


Autofocus does not work


from White Plains, NY  -  Photo Enthusiast

I bought this teleconverter to increase the focal length of my telephoto lenses, and the autofocus does not work. I have tried it on the Canon - EF 70–300mm f/4–5.6 IS USM and the Sigma - 150-500mm f/5-6.3 PO DG OS HSM, and it works on neither. I can still use it on manual focus, but obviously it is not too convenient when photographing wildlife in movement.


Incompatible with Canon EF-S lenses


from Kennewick, WA  -  Photo Enthusiast

This lens fits the Canon EOS body, but does NOT attach to EF-S lenses. The pamphlet that comes with the lens clearly indicates this; the Adorama website does NOT. It should. Customer pays for shipping both ways, and has nothing to show for it. DO NOT BUY THIS LENS IF YOUR INTENT IS TO MATE IT WITH CANON EF-S LENSES.


Auto focus does not work with D3200


from atlanta, ga  -  Photo Enthusiast

I read several places that this will work with a Nikon D3200 auto focus, but it does not. I am returning the item for a refund.

(0 of 1 customers found this review helpful)


Not Perfect


from Columbus OH  -  Photo Enthusiast

I really wanted something that would get me closer to wildlife. While this product did the job, the results were poor: the extender eats a lot of light. Under ideal lighting, it would be fine. Anything else and you get high ISOs and grain.


I would buy this product again and again


from Dallas, Texas  -  Photo Enthusiast

Love this product. Picture quality is excellent. Glad I spent the money on this item rather than a cheaper one. I love this product.


Just Didn't Do It For Me .....


from Davidsonville, Md  -  Photo Enthusiast

I had hoped to use this product to double the length of my 70-300 telephoto for some wildlife shots. It certainly did double the length, but with a trade-off I wasn't willing to accept. I had been told that the converter would also double my f-stop (which it did) but it also did not produce sharp images. Admittedly, it was a long shot (no pun intended), but I would recommend just sucking it up and buying longer glass if you want clarity.


Do not buy this teleconverter!


from Northern Virginia  -  Photo Enthusiast

I bought this teleconverter to increase effective focal length of my nikon 70 to 300mm zoom lense. The device did not allow autofocus at all. I took images using manual focus, and in all cases the resulting image had extremely poor contrast and unacceptablely poor sharpness. Results were much worse than simply cropping an image shot with the straight lense without teleconverter . I rated this teleconverter 1 star, because zero is not an option.


Meets Expectations


from Watauga, TN  -  Photo Enthusiast

It does what it says it will. it can work with autofocus but do not depend on it in Nikon DX cameras. Manual works fine and is as others have noted. it does fit a 5100.

(2 of 2 customers found this review helpful)


CAUTION - Will Not Fit EOS EF-S Lenses


from Pensacola  -  Photo Enthusiast

Did not fit my EOS EF-S lenses, as was noted plainly on the instruction sheet included in the box with the lens - but was not noted on the web site.

(1 of 2 customers found this review helpful)


less than thrilled


from Norman, OK  -  Photo Enthusiast

I have only had the teleconverter for 2 days and tried it with landscape, birds and flowers. I have an A200. It didn't work in manual or auto with my Sony 3.5-5.6/18-70 kit lense or my Tamron F/3.5-4.5 SP AF 10-24 DiII. But I really wasn't expecting it to work with those 2 lenses. It worked in both modes with my Tamron Di AF70-300 F4-5.6 LD macro lense. The results weren't as good as I was hoping but I was shooting without a tripod. I had to work with settings to get decent shots in different lighting, indoors and out. It worked in both modes with my Tamron SP AF 200-500mm F5-6.3. It wouldn't auto focus when shooting through shrubs or if various shades of green, from foilage, were in the frame on a sunny day. I had to use it mainly in manual mode. I shoot a lot of wildlife and flowers. So I still have more situations to test with. But so far I am not impressed.


Questions & Answers Powered by TurnTo®

Questions about this item:

Shopper  Will this tele converter work with a DA L Pentax Lens?
VERNON P  I have no need to use it with my DA L 18-55 mm lens. I usually use it with my Tamron 70-300 lens with no issues. That said, I see no reason why it should not work.
fred T  Is this tele converter for Pentax camera and autofocus lenses ?
AL A  Yes I use it on my Pentax K-X and it seems to work fairly well. You do need a steady hand or tripod for best results. It does fit the lenses, including a Tamron 28 - 300 lens that I have but if I remember correctly the manufacturer says that you need to use the manual focus with this converter. Have tried the auto focus and it doesn't always focus in clearly on object your shooting. Hope this helps
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