Attaching EFWmini to ASI1600MMC

olav

Hi,

While I'm waiting for the shipment I'd like to check details on assembly, and then order adapters and possibly an OAG.

I can't find any good closeup images around, to confirm if the camera body has male T2-threads directly on the camera body, or if another method of attachment is used. The text is simply "Attached the camera to the EFW as shown." (http://astronomy-imaging-camera.com/manuals/ASI1600%20Manual.pdf sect. 7)

Either way, is it somehow possible to control that the "hanging end" (drive side) of the filter wheel will point the same way as the short axis of the imaging chip?

In the mounting sample from the manual the filter wheel seems to be aligned this way, but not on the EFWmini product page (http://astronomy-imaging-camera.com/wp-content/uploads/P1010774.jpg)

The (rather odd) reason I'm asking is that my most frequent use of this stuff is supposed to be with C11HD + Hyperstar. I have designed (and pre-tested) an elliptical off-center vignette to remove possibly annoying diffraction spikes and odd star shapes caused primarily by the corners of the filter wheel hanging into the light path.

I see that I have just enough backspace to fit a slim off-axis guider with a compact guiding camera hiding within this vignette if the EFWmini can hang out from the long side of the imaging chip as mentioned.

Anyone with EFWmini and ASI1600?

Sam@ZWO

you can use our OAG which is coming soon

olav

Thanks Sam,

I will consider your OAG when it arrives.

For now I have chosen a setup with a TSOAG9 that I had in a drawer. This one is maybe OK, but I would like a bigger prism than the 10x6mm. SX has a 10x8mm for their Lodestar, but that wouldn't fit my tight Hyperstar setup. Besides, M48 threads 2,5mm long on the scope side is a bit short for "feeling stable".

Then I assume the EFWmini is attached to ASI1600MMC with T2-threads alone.

I have a some very thin T2 spacers/shims in case the camera does not attach perpendicular to the wheel. If so, I guess it would be luck with threads.

What is the T2 thread length for the EFWmini?

Thanks :)

Sam@ZWO

our OAG is 16.5mm thickness

8X8 prism

The T2 thread of EFWmini is 4mm length

olav

8x8 prism is nice, better than the commonly used 6x10 found in the usual slim models. So we'll see it in the webshop soon?

Backfocus requirement of 16.5 is basically good, but for my needs this time I'd wish it had an incorporated tilter! (maybe too much to ask for..)

Guess the guider mount is natively T2. Or is it C-mount?

Thanks :)

Sam@ZWO

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