2X 2" TeleVue Powermate

[MarkAR]

I'm considering buying the 2" 2X Powermate to double the focal length of my Altair Wave 115 EDT.

Would I need the adapter to use it with my SXCCD 694 and filter wheel or maybe some M48 spacers ?

The wheel has M48 male thread and total distance to sensor is 48.5mm. I have 5mm and 7.5mm spacers I could add.

Sampling rate would be 0.58"/px so a little over sampled but 2x2 binning returns it to 1.16 "/px if necessary.

Basically I want to "get closer" to some of the smaller DSS objects.

[John]

I've owned a couple of the 2x 2" Powermates (separate times). I don't image but I found them optically superb for visual observing. Apart from the amplified image, you would just not know they are there.

There are others that get very close and cost less it has to be said. The ES Focal Extender is an example.

But the Powermates are top class IMHO

Used with a big eyepiece you do get a tall stack though

 

[MarkAR]

Thanks John, they do seem to be the best.

Will try to find out more about imaging with them.

[Waldemar]

The 2x 2"PowerMate is not critical concerning back focus distance. In this file you will find a lot of info about them all

Powermates.docx

Edited May 29, 2020 by Waldemar

[Merlin66]

Mark,

Should work well for you. Just buy the T thread adaptor which goes with the x2 PM. Sounds like you may also need a T thread to M48 adaptor to fit the filter wheel.

 

[MarkAR]

Cheers @Waldemar, I shall absorb as much of that as I can.

6 minutes ago, Merlin66 said:

Mark,

Should work well for you. Just buy the T thread adaptor which goes with the x2 PM. Sounds like you may also need a T thread to M48 adaptor to fit the filter wheel.

 

Looking at descriptions and images, the power mate has a M48 thread that you attach the adapter to. So it looks like I would need an M48 female to M48 female adapter.

[Merlin66]

Mark,

Hmmm I don't have a 2" PM at the moment to check..... where did you see that the thread in the body was M48????

 

[MarkAR]

Honestly can't remember, I might be mistaken.

In fact I must be wrong if the thread on the adapter is either M42 or M48 then it must be larger.

[Davey-T]

Thread on the adapter to Powermate is 50 something mm but they just screw together, other end to T ring is 42mm male

Dave

Edited May 30, 2020 by Davey-T

[MarkAR]

Thanks Dave, so I'll need the adapter and also a M48 female to female adapter.

[Davey-T]

Sorry Mark that should be 42mm edited it now, I blame the late hour 😁

Dave

[MarkAR]

No worries Dave, it would have been perfect if it was an M48. Though I might be able to make one up if nothings already available.

[Davey-T]

Got it out to measure it which was handy as it had a T ring  on the end of it that I was hunting everywhere for yesterday 😂

Dave

[Waldemar]

The thread on the PM, when taking off the ep connector is definitely M48 male

[MarkAR]

31 minutes ago, Waldemar said:

The thread on the PM, when taking off the ep connector is definitely M48 male

Superb, that makes it easier. Thank you for confirming.

[Waldemar]

2 hours ago, MarkAR said:

Superb, that makes it easier. Thank you for confirming.

I am so sorry, but I got it wrong... 😳

The thread is a specific size ( M51?) to connect a T2 adapter, which is M42 male.
A special adapter is available for the 2x as well as for the 4X PM

Again sorry for the confusion...

 

Edited May 30, 2020 by Waldemar

[MarkAR]

Confusion abounds. Maybe I should just buy one and make up an adapter to what I want.

I really wish that all manufacturers would state specific thread sizes for all connections and adapters. That would make it so much easier to find what you want.

Thanks for the help though, much appreciated.

[Davey-T]

To help unconfused a few pictures worth a thousand words

Dave

[MarkAR]

Excellent Dave, looks like I'll need the PM adapter and also a female M43 to female M48 to fit my filter wheel.