[Aavso-photometry] DSI Wide

[Keith Robinson]

Hello All and all the best for the season from England

My interest in the DSI wide was really as a Christmas present for my wife 
who likes doing the pretty picture thing (I'll stick with our 8inch 
Newtonian for photometry). Following Jeff Hopkins advice I've now ordered a 
Mogg adaptor for use with Olympus lenses; my wife has an OM 10 with a 
variety of lenses so it's a case of not having these go to waste.

On removing the nose piece from the DSI Pro the thread on the filter cage is 
indeed Pentax 42mm compatible but yes you do also need an extension tube in 
addition to get the focus.

Anyway hopefully the Mogg adaptor will do the job but it'll have to serve as 
a birthday present instead.

Best regards

Keith



----- Original Message ----- 
From: "Mojo" <ukwildcats at knology.net>
To: "Keith Robinson" <starlightskies at talktalk.net>; 
<aavso-photometry at mira.aavso.org>
Sent: Saturday, December 22, 2007 7:25 PM
Subject: Re: [Aavso-photometry] DSI Wide


> Hello All,
>
> I have been able to attach an older universal thread mounted SLR lens to 
> the DSI. The threads are the same or close enough to work. The filter 
> cradle is attached. In order to get a focus, an extension tube about 3/4 
> inch long, is placed between the lens and the filter cradle. The only lens 
> I have with the universal thread is a 55mm f/1.4. Older lenses made by 
> Pentax, Ricoh and Mimaya (not sure on the spelling) will work. I have been 
> trying to find wide angle lenses around 28mm or so and telephoto lenses 
> around 135mm to 200mm but no luck. Have seen some on Ebay but have not 
> bought any. The 55mm lens gives a good shot of M31 at about a 4 degrees by 
> 5 degrees field. I do not have much spare time and good clear nights are 
> few so I'm under the learning curve and the photos are not as good as 
> expected. More operating time is needed. Actually, using the 55mm lens has 
> been my way of learning to use the DSI. Telescope mounting will come 
> later.
>
> As for photometry, AAVSO has a recommended arcsec/pix image scale ( 2-3 or 
> 3-4, I do not remenber actally what it is) but that would require a much 
> longer focal length than most camera lenses. How feasable would a 55mm 
> lens or even a 200mm lens be for photometry?
>
> Thanks,
>
> Gary Huffman
>
>
>
>
> ----- Original Message ----- 
> From: "Keith Robinson" <starlightskies at talktalk.net>
> To: <aavso-photometry at mira.aavso.org>
> Sent: Friday, December 14, 2007 12:52 PM
> Subject: [Aavso-photometry] DSI Wide
>
>
>> Hello All
>>
>> I've been trying to get hold of a 'DSI Wide' cradle for the Meade DSI Pro 
>> together with adaptor for Olympus lenses. My efforts have been utterly in 
>> vain. Anybody any idea where it might be possible to get one of these?
>>
>> Many thanks
>>
>> Keith Robinson
>> _______________________________________________
>>
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>> Aavso-photometry at mira.aavso.org
>> http://www.aavso.org/mailman/listinfo/aavso-photometry
>>
>>
>
>