Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
04-03-2014, 06:15 PM   #1
Designosophy's Avatar

Join Date: Sep 2010
Location: Northeast Philadelphia
Posts: 1,098
Feedback Score: 23 (100%)
Pentax Helicoid Extension Tube K Marketplace Listing

Item for Sale
Pentax Helicoid Extension Tube K

Asking Price
99.00 USD

Item Location
Elkton, Maryland (United States)

Item Description
I've been holding on to this helicoid extension tube for a few years, but I just don't use it enough. I'm not a macro shooter, and that's what it's really best for. It's also good for reducing the minimum focal distance of any lens with an aperture ring. I used it with my K 400 f/5.6 a couple times. It turns any K-mount lens into a preset lens (like a K-adapted M42 lens). In the reviews, someone said that it goes from a number 2 extension tube to the equivalent of a number 2 plus a number 3. I can't verify this, but according to my ruler, it goes from 25mm to 45mm. The helicoid is mostly smooth, but when extending it, there is a rough spot in the middle of the range. It doesn't grind or anything; it just gets harder to turn for a small bit. Completely smooth when reducing.

One thing to keep in mind: Since there is no aperture lever connection, you can only use this with a lens that has an aperture ring. If you use it with a DA-type lens, then it's going to stay at the highest f-stop. But any FA, F, A, M, K, or adapted Takumar lens should be fine. It's in very good shape - I don't see any brassing, scratches, or dents. And it mounts snugly both ends. No light leaks.

Priority mail shipping to continental US included in price. International (including Canada): Buyer pays actual shipping. No additional fee for PayPal.

Here are some photos (taken with my cell phone; sorry for the less than stellar quality).

Are you the original owner of the item being sold?

Are you selling or trading this item?

Item Condition (Key)

Shipping Destinations

Shipping Charge
Priority Mail included for US Int'l pays actual Priority Int'l rate

Shipping Services
Priority Mail. Others extra

Accepted Payment Types

Return Policy & Additional Details
Return only if not the right item or not as described.

Please send me a private message if interested in the item!

---------- Post added 04-03-14 at 10:27 PM ----------

Sale pending - wow, that was fast!

Attached Images

  • 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!
aperture, buy pentax, classifieds, extension, for sale, helicoid, helicoid extension tube, item, lens, mail, pentax for sale, pentax helicoid extension, pentax marketplace, priority, sell pentax, tube
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
Asahi pentax helicoid extension tube k Weevil Pentax Price Watch 0 02-19-2013 08:52 PM
For Sale - Sold: Genuine Pentax 6X7 Ext tube set, helicoid extension. Phil1 Sold Items 6 08-07-2012 04:47 PM
For Sale - Sold: FS: Pentax K Helicoid extension tube jslifoaw Sold Items 3 10-17-2007 07:07 PM

All times are GMT -7. The time now is 08:02 PM. | See also:, 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?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]