Raynox 43mm to M42 coupler for reversing

ChrisR · Post by **ChrisR** » Sun Apr 16, 2017 4:09 am

Rafcamera has these
which saves a 3-ring solution:

http://www.rafcamera.com/en/adapter-m43 ... x1-coupler

It would work like this:
(nb - I don't have one and this isn't to scale:)

Right now it's not on his eBay site but when it appears I expect it'll be post free.

axle01 · Post by **axle01** » Sun Apr 16, 2017 4:48 pm

Strange you posted this Chris, about a week ago I asked him to make these for me and 2 of each are on their way to me.

Hi Alan.
Your adapters are finished:
http://www.rafcamera.com/en/adapter-m42x1f-10mm
http://www.rafcamera.com/en/sdr-m52x0-75-to-m43x0-75
http://www.rafcamera.com/en/adapter-m43 ... x1-coupler
http://www.rafcamera.com/en/revers-adap ... -to-m42x1m
Thanks.
Raf.

Al

ChrisR · Post by **ChrisR** » Mon Apr 17, 2017 3:08 am

I suggested it to him a couple of weeks ago.
He's pretty quick to make things. I imagine he has it very automated.

A 52 to 43 would be more use for reversing if both threads were female.
Then the 52 could take a flat objective adapter.

axle01 · Post by **axle01** » Mon Apr 17, 2017 4:20 am

ChrisR wrote:
A 52 to 43 would be more use for reversing if both threads were female.
Then the 52 could take a flat objective adapter.

Chris would a flat adapter be better than a cone.

Al

ChrisR · Post by **ChrisR** » Mon Apr 17, 2017 7:58 am

I have a couple of cones. Good for a few things but internal reflections can be a problem, they need flocking. For a long thing like a Mitutoyo I don't see much point, and their extension can be unwanted.
M42 works OK. And it suits the available diaphragms.
If you want to use a ring flash, screw on hood or diffuser, you can use one of Rafcamera's other adapters..
I do have one of those.

axle01 · Post by **axle01** » Thu Apr 27, 2017 1:11 am

From left to right
Microscope objective
Rafcamera 25mm to m43x0.75 step ring
Rafcamera m43x0.75 to m42x1m female step ring
Reversed Raynox 250
Rafcamera m49x0.75m to m42x1m step ring
M42 extension tubes
17-31 macro focusing Helicoid adapter to Sony A7rii
Sony A7rii

I am yet to test this as I'm not sure what length from objective to camera to add extension tubes

http://www.rafcamera.com/en/revers-adap ... -to-m42x1m

http://www.rafcamera.com/en/adapter-m43 ... x1-coupler

axle01 · Post by **axle01** » Thu Apr 27, 2017 7:41 pm

ChrisR or rjlittlefield have you a suggestion as to the total length I should start with.

Alan

Pau · Post by **Pau** » Fri Apr 28, 2017 8:44 am

axle01 wrote:...have you a suggestion as to the total length I should start with.

I don't know that distance but the right position is the one where the Raynox tube lens itself (without objective) will form a focused image of a distant object "at infinite"

rjlittlefield · Post by **rjlittlefield** » Fri Apr 28, 2017 11:42 am

axle01 wrote:ChrisR or rjlittlefield have you a suggestion as to the total length I should start with.

Pau's test always gives the right answer.

As a starting point, the label on my Raynox DCR-150 says "Infinity focus at 175.9 mm from male shoulder of reversed lens to flange of Canon camera". You'll need to adjust that for the thickness of the lens and your adapters, and for the flange focal distance of your Sony versus my Canon at 44.0 mm.

The label on my DCR-250 says the same thing, but 90.5 mm.

--Rik

axle01 · Post by **axle01** » Fri Apr 28, 2017 3:33 pm

Much appreciated thanks guys.

Alan