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Forum: Lens Clubs 10-21-2010, 02:07 PM  
Lens Fetish Club
Posted By CertEdFriday
Replies: 496
Views: 121,280
May I join in?

FA* 200 f/2.8
DA* 300 f/4
FA* 300 f/4.5
FA* 24 f/2
FA* 200 f/4 macro
FA* 80-200 f/2.8
A* 200 f/4 macro
FA* 600 f/4
DA* 60-250 f/4
FA* 300 f/2.8
FA* 28-70 f/2.8
FA* 400 f/5.6
FA* 85 f/1.4
F* 300 f/4.5
Forum: Do-It-Yourself 08-22-2010, 01:13 PM  
Pentax Reverse Ring Light Holder
Posted By CertEdFriday
Replies: 5
Views: 8,056
I have often wanted to use a reversed lens for taking macro images. No 1 problem, once the lens reversing ring (49mm or 52mm Pentax original) has been located, is lighting the subject effectively. There used to be a Pentax Reverse Ring Light Holder K manufactured by Pentax:

Despite posts on this and other forums - no luck in finding said item, so I decided to make one. The guy that gave me the idea was Peter Smith, who regularly posts on another forum. He posted a project similar to this a few years back and I had it on my list of things to do since then. So here goes.

Firstly I purchased a cheap but functional set of extension tubes and then took the male half of the 12mm tube apart and discarded it. I then used a cheap 49mm uv filter and removed the glass.

I then removed the female mounting plate from the 12mm extension tube and cleaned it of grease and and dirt. I then reassembled the front mounting plate and then glued the filter ring into the space left by the removal of the male half of the extension tube.

I retained the locking pin mechanism, so had to be careful to keep any adhesive away from this area.

Once the adhesive (Araldite Rapid Steel) was applied to both parts I then left it to cure overnight. Next day, after a bit of scraping to remove surplus adheshive, the job was done. Now I had a device I could fit to the reversed lens and lock into place and then fit the 49mm ring flash adapter in place to mount the flash. The results are shown below...

Front view of new mount:

Rear View:

All the parts together:
Ring Flash - Mounting Ring - Newly made adapter- Reversed Lens - Reversing Ring and Camera

Fitted and ready to go:

A couple of quick images to test the system works...
5 pence coin

Ballpoint Pen

The project took about an hour in total and I think makes a worthwhile addition to my macro kit!

(For larger images - see my album - Reverse Ring Light Project)
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