RE: [APML] 1st BRC mosaic: heart & baby

["Loke Tan" <tan@cox.net>]

Bobby,

 Really nice shot. This must have been a lot of work. Did you have to
anti-vignette the shots. Having used the BRC, I have been a bit afraid to
attempt any mosaics with this scope dur to noticeable light dropoff in the
6x9 frame.
 I got my BRC used and was dreading the thought of having to collimate this
scope. After receiving it, I got it mounted pretty quickly and to my
surprise, it was perfectly collimated. I know how difficult it is to
collimate an RC from my experience with my RCOS 12.5" f/9 scope. Till today,
I must say that I have never been able to perfectly collimate this scope. It
is very close but not perfect. Fortunately, the BRC came exceptionally well
collimated. I was racking the focus in and out and the concentricity of the
out of focused rings were exceptional. In fact it reminded me of the rings I
would see in typical AP/Tak refractor. Someone spent a lot of time
collimating this scope and till today it has remained in collimation. I am
not sure if it was TNR or Takahashi Japan who did this. Needless to say I
was pleasantly surprised. The unfortunate thing about this is that I am
afraid I would not be very useful in providing any assistance in
collimation. I read the manual (translated From Japanese) and I am very glad
I do not have to collimate this scope. I think the manual might require a
better translation. There was mention recently on Yahoo-Tak-uncensored group
regarding someone working on a new version of the manual.
 Bobby, have you attempted to collimate your BRC or are you using it as is?

Loke



> -----Original Message-----
> From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
> Behalf Of Bobby Middleton
> Sent: Saturday, November 16, 2002 10:56 AM
> To: astro-photo@seds.org
> Subject: [APML] 1st BRC mosaic: heart & baby
>
>
> I finally tried a mosaic with the BRC. I knew I would have more color and
> brightness issues with the BRC's uneven illumination than I have to deal
> with for my Newt mosaics, but it seemed to work out OK I guess. I
> would like
> everyone's opinion on the background color. I've tweeked and tweeked but I
> can't seem to find that "finished look" if you know what I mean.
> http://www.koyote.com/users/bobm/Heartandbaby.htm
>
> I also had some film flatness issues that can be seen at higher
> resolution,
> and there's still the collimation to get right. I have a collimating
> telescope on the way for the BRC now. Anyone who has experience in
> collimation with one of these please e-mail me. (Steve, Loke--you guys
> adjust yours any yet?)
> The mosaic is 2 frames; each being a 2 stack of E200 (60 min) and a single
> 50 min TP exposure.
> Comments and thoughts welcome.
> Bobby Middleton
>
>
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