Modified Low Profile Cover

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Modified Low Profile Cover

Postby laserjam » Mon May 15, 2017 6:30 pm

Quote from your products offer:
"ASI 1.25″ Low Profile Cover can reduce the back focus distance of ASI Cameras to around 5mm".

Great improvement.

Here, I would suggest a version where no nosepiece is present.
In place of the nosepiece, a T2 male screw would be great, so that I could screw my 224
directly to the filter wheel.
So a minor question would be about the "phase" angle between the body screw and the T2 screw,
I don't know whether the female screws on the filter wheels are randomly "phased" or not.
A minor question indeed, since one may rotate at his own will the whole stuff, after the camera has been screwed.

A more complex design could also include an integrated female 31.8 mm filter screw for more specific situations, but I'd be glad with the T2 screw only...

Thanks for your attention.
Regards,
Salvatore
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Re: Modified Low Profile Cover

Postby Sam » Wed May 17, 2017 1:17 am

Hi Salvatore
thanks for your suggest
but I don't under stack why do you wish to connect 224 directly to EFW?
I think the sensor of 224 is so small and don't care the distance between EFW and itself
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Re: Modified Low Profile Cover

Postby laserjam » Wed May 17, 2017 4:11 pm

Sam wrote:Hi Salvatore
thanks for your suggest
but I don't under stack why do you wish to connect 224 directly to EFW?
I think the sensor of 224 is so small and don't care the distance between EFW and itself


Hi Sam,
thanks for your reply.
I wished to try old reflex lenses, for example an old Maksutov telephoto.
Some of these Maks can be cheaply modified, even with the addition of a focal reducer which hopefully doesn't degrade too much the quality at the edge of small sensors.

While I was doing some attempts, I found the follow:
the shorter the total length of the rings, adaptors and filter wheel used, the shorter would be the equivalent focal length.

That said, I understand that the sensor would be less protected from stray light, because of the open sector of the filter wheel in its vicinity. The nosepiece is a shield itself.
But this problem could be easily bypassed.

Regards
Salvatore
P.S. To All: please, this is not an invitation to destroy your nice Maksutovs. I did not find any sample imagery through similar setups I described. So I would like to try myself, and because I have no access to any machinery resource I shared my idea.
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Re: Modified Low Profile Cover

Postby Sam » Thu May 18, 2017 9:54 am

got it, we won't do it as there is very few such requirement
you know even the low profile cover don't have too many users
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Re: Modified Low Profile Cover

Postby laserjam » Thu May 18, 2017 12:45 pm

Sam wrote:got it, we won't do it as there is very few such requirement
you know even the low profile cover don't have too many users


Thanks again for your reply.
I understood.
Just for the add, in the most critical situations, I screwed the 224 directly to the filter wheel using the T2-C mount holder as a double male ring, not to be done in the night, not to be done in a hurry.
Regards,
Salvatore
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