Veteran Member Registered: September, 2017 Location: Medellín Posts: 1,322 | | Review Date: December 31, 2019 | Recommended | Price: $80.00
| Rating: 10 |
| Pros: | Build quality, able to rotate. | | Cons: | | |
I have both. They work as intended, plus they rotate so you can have the aperture readout on the lens on top. Any lens with these filter threads can be used, and with adapter rings the options are pretty much limitless.
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Site Supporter Registered: October, 2008 Location: Vancouver, Canada Posts: 8,090 | | Review Date: January 13, 2015 | Recommended | Price: $70.00
| Rating: 8 |
| Pros: | Easy to use and works with many lenses in two formats. | | Cons: | The tightening screw is hard to use and does come loose. | |
Not much to review here as you are dealing with a simple device for reversing lenses on the Pentax 6x7 system. There are two reverse adapters you can use on the Pentax 6x7 bodies, a 49mm and a 67mm. Both will work on either the 6x7, 67 or 67ii Pentax bodies.
It is recommended to use these reverse adapters along with the Pentax 6x7 Helicoid Extension Tube.
The Helicoid tube is mounted to the 6x7 body, then the reverse adapter is mounted on the Helicoid tube, then the reversed lens is screwed into the front of the reverse adapter.
I have both adapters and here is a quick usage summary:
49mm Reverse Adapter:
Yes you can take a 35mm format lens with a 49mm filter thread and reverse it on a Pentax 6x7 body!
You can get very high magnification rates, close to 5x magnification with my Super Takumar 28/3.5 reversed with the Helicoid extension tube at full extension. However you also have a high light loss, with an exposure factor between x23.1 to x30.1. The results are pretty amazing for a medium format system, where you typically are lucky to get 2x magnification with a 6x7 lens. Recommended lenses are in the 28mm to 55mm focal length range.
67mm Reverse Adapter:
Your magnification rate is much lower using a 6x7 lens reversed with a Helicoid extension tube. The best lens I have used is the 67 75/2.8 reversed and I can get around 1.75x to 2x magnification. If you want higher magnification then you need to add the Auto Extension No. 1, 2 or 3 tubes. Usable lenses are the 75/2.8, 90/2.8, 105/2.4 and the 135/4 macro.
Usage notes for either adapter:
There is a screw on both adapters that allows you to adjust the orientation of a mounted lens so that the “index mark” is at the top. The tightening screw is a bit small and hard to use, so when you move the lenses aperture ring to stop down you might also adjust the lens orientation.
If you have a Pentax 67ii, then using a telephoto “bright” screen is very helpful in focusing at these higher magnifications.
If you are using a Pentax 6x7 or 67 with the TTL metered prism or a 67ii with the AE metered prism and an “AUTO” diaphragm lens please note the following:
YOU CAN FOCUS WITH THE LENS DOF LEVER IN THE “AUTO” POSITION,. HOWEVER YOU MUST SET THE LENS DOF PREVIEW LEVER TO “MAN” TO GET A METER READING. THE 6X7/67 TTL OR 67II AE METERS WILL NOT GIVE A READING IF THE DOF LEVER IS IN “AUTO”. IF YOU ARE USING APERTURE PRIORITY ON THE 67II/AE YOU MUST LEAVE THE LEVER IN THE “MAN” POSITION WHEN YOU PRESS THE SHUTTER, OR THE APERTURE WILL DEFAULT TO WIDE OPEN. THE AE METER WILL ALSO DEFAULT TO CENTRE-WEIGHTED METERING WHEN USING AN EXTENSION TUBE. | |
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