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Hi all,

I just sent my Coronado BF-15 diagonal to Meade for an in-warranty repair/replacement of the blocking filter. Has anyone else here done similarly, and if so, have you observed the reappearance of any rusting of the filter?

Many thanks,

Ed

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Hey OOgie good to see you and Floyd again.

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Hi Ralph. I'd never have pegged you as an "Uncle Floyd & Oogie" fan. Wow, the things that you can learn on CN!

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Ed

Televue TV76
Coronado SM60/BF15
Meteorite Collection
IMCA #8911 - http://www.imca.cc

“A graduation ceremony is an event where the commencement speaker tells thousands of students dressed in identical caps and gowns that 'individuality' is the key to success." - Robert Orben

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Hello Ed, I've sent mine back 1 time over a 5 year period and it came back with a different type of ITF, the turquoise colored filter. The Original appeared silver on one side turquoise on the other with a black painted on band around the outside, the replacement was darker turquoise with an aluminum ring around the outside which had the band pass printed on the aluminum ring. Visually I can't say I could tell the difference between them but the newest one appears to be going strong since it was replaced a few years ago. I'm not sure they've cured the issue but so far so good. I kind of expect it to happen sooner or later due to the materials they use to make them so I keep mine stored air tight with silica when not in use. The newer one with the aluminum band appears to be a better quality build but we'll see. I've also had the ITF on my calcium scope go bad and had to get it replaced also. In each case it took about 2 to 3 weeks to get the replacement. I also purchased a newly refurbed PST, the one with the dark blue front and its ITF at the bottom of the eyepiece holder went bad also. It was a different kind of ITF in that it had a red glass side and a turquoise front. So far I've seen them go bad around a 2 to 2.5 year period and this is with a good storage method being used but so far the aluminum band itf has not gone bad on me and its coming up on a couple years now.

Clear Skyz, LA

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hi all

i will build right away a hermetically closed housing for my B1200 from LUNT in order to keep it in shape for more then 5 years (warranty end). Does it make sense to store the whole lunt, incl. filter in silicagel dreyed air?

walter

walter

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How could these companies possibly have let themselves get into the position where it takes FOUR MONTHS!!! or longer to perform a 1 hour repair job?

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Unfortunately, while a Coronado blocking filter can be used with a Lunt etalon, a Lunt BF can’t be used with a Coronado etalon.

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Unfortunately, while a Coronado blocking filter can be used with a Lunt etalon, a Lunt BF can’t be used with a Coronado etalon.
<SNIP>
However, the actual part of the blocking filter that fails (“rusts”) – the Induced Transmission Filter (ITF) – is relatively inexpensive and somewhat “universal”, and might be available through Lunt.quote]

Bob,
Thanks for all of this info. I was completely unaware of the "makings" of the BF, and it is a relief to know that the ITF can be replaced outside of Meade, and perhaps even by Lunt.

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Ed

Televue TV76
Coronado SM60/BF15
Meteorite Collection
IMCA #8911 - http://www.imca.cc

“A graduation ceremony is an event where the commencement speaker tells thousands of students dressed in identical caps and gowns that 'individuality' is the key to success." - Robert Orben

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I sent my Solar Max 60 scope back to Meade for Warranty service because the etalon was not performing as expected. I was originally told that it would be two to three months. To make a long story short I finally got it seven months later in fine working order.

The ordeal did test my patience but at least I now have a working scope.

Hopefully you will have the same results.

BTW Meade payed for the 2 day air return shipping.

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The LUNT a nado

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Stephen,
VERY NICE! I imagine the photos were taken at an outreach event?

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Ed

Televue TV76
Coronado SM60/BF15
Meteorite Collection
IMCA #8911 - http://www.imca.cc

“A graduation ceremony is an event where the commencement speaker tells thousands of students dressed in identical caps and gowns that 'individuality' is the key to success." - Robert Orben

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Theoretically yes -- it wold be the same as doublestacking identical front etalons. The only caveat I would have is the potential spacer overlapping issue -- depending on the filter sizes you are trying to mate you will have four vs. one or three obstructions. You will aslo have to make the appropriate adaptor to mate each etalon.

If I were going this route, if availalbe I'd use a Lunt pressure-tuned etalon as the "primary" (closest to the objective) and use the Coronado as the secondary etalon stacked on top of it (this also applies to DSing a Lunt scope with an internal etalon). Otherwise use the etalon which requires the leaast amount of tilt as the primary, and rotate the other etaon to where the ghost images are farthest off-center, thereby requiring the least amount of additional tilt to remove them from the field of view.

The blocking filter will generally have to be the one for the etalon with the narrowest FSR, i.e. the Coronado.

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