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  #21  
Old 07-09-2007, 07:52 PM
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h0ughy (David)
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Originally Posted by [1ponders] View Post
Yeah but it's money that could go towards a Tak


Besides I'd need some clear skies to give it a go.
well that settles it then doesn't it? I have played with these things before - get a big big hammer and drop it on your foot Paul - take your mind of the shiny bits
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  #22  
Old 07-09-2007, 07:58 PM
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Ok, I just had a bit more of a look at the specs and did some calculations. There was an error in my assumptions. The dimensions are 3"x3.5" (Diam x length). ie 75mm wide to outside of lens. That would make the lens aperture only 62.5mm (500/8). But is it really f8 (is an f10 sct really f10 if it doesn't have 200mm clear aperture for a 2000mm scope )
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  #23  
Old 07-09-2007, 08:07 PM
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it seems alittle light for a decent mirror lens . must be alot of plastic in it.I bought a russian 1000mm f10 maksutov mirror lens earlier in the year and am pleased with the pics it produces.This lens was given a good review in sky and space in 1996. mind you it does weigh sustantially mor than the lens in ebay. have attached an eclipse picture taken through it.
regards philip
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  #24  
Old 07-09-2007, 09:06 PM
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4", not that's what I'm talking about. Thanks Philip.

Bet it is a weighty sucker.
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  #25  
Old 07-09-2007, 10:15 PM
Dennis
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Personally, I'd go for the WO 66mm F6.1 Petzval at $399 with a 10:1 fine focuser. In fact, I did and it is great as a guide scope and a grab and go 'scope too!

Cheers

Dennis
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  #26  
Old 08-09-2007, 07:25 AM
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Don't do that Dennis!!! I've been trying not to look at them. How can I afford a FS60-C Tak if I by every little 66 that comes along





What's it like for photography?
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  #27  
Old 08-09-2007, 07:33 AM
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Quote:
Originally Posted by [1ponders] View Post
Don't do that Dennis!!! I've been trying not to look at them. How can I afford a FS60-C Tak if I by every little 66 that comes along





What's it like for photography?
I think Louie took some stunning images with one in the deep sky section
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  #28  
Old 08-09-2007, 07:52 AM
Dennis
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Originally Posted by [1ponders] View Post
Don't do that Dennis!!! I've been trying not to look at them. How can I afford a FS60-C Tak if I by every little 66 that comes along

What's it like for photography?
Hi Paul

I’ve not tried it yet as I lent my SCT to T-mount adapters to Tony (Firstlight) for the Lunar Eclipse, so I haven’t had the opportunity to test it out. I purchased the unit mainly for auto guiding as I had the rings to fit it and it looked a solid ‘scope with the Crayford 10:1 fine focuser, and the best bit - Ron at Sirius Optics had them on special for $359.

I’m a bit wary of Tak ‘scopes these days – they seem to require very expensive, non-standard, custom made adapters in order to do anything with them. It’s okay if you can plot out in advance what you require, but my experience has been that getting the right information is like getting blood out of a stone and then there is a 6 month wait for the adapters.

Cheers

Dennis
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  #29  
Old 08-09-2007, 07:58 AM
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Yeah that is my concern re the Tak as well. I know this is a bit off topic but I've been humming and hawing over the Petzval since astrofest. I understand that the focuser isn't a "real" 2" focuser and there are some issues getting it to come to focus for photography? Any comments?

$359 that is better than Andrews at $399
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  #30  
Old 08-09-2007, 08:01 AM
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Just checked, they've certainly gone up in price now. I knew I should have gotten it at AF.
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  #31  
Old 08-09-2007, 08:21 AM
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Just checked, they've certainly gone up in price now. I knew I should have gotten it at AF.
Hi Paul

Ron had a special purchase offer in the shop at Underwood on a limited number of units he had in stock, before Astrofest. I think the price went up once he sold those particular units and the next order came in?

They do require a 2" SCT diagonal to reach focus though.

Cheers

Dennis
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  #32  
Old 08-09-2007, 08:23 AM
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They have an SCT thread on the end and not a T thread

Would they reach focus using a standard SCT to T adapter? (You know the straight one used to attach a SCT FR to a DSLR T ring adapter)
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  #33  
Old 08-09-2007, 08:25 AM
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I guess I won't be getting a mirror lens then. Mind you I do like the idea of the compactness of them.
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  #34  
Old 08-09-2007, 08:32 AM
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Quote:
Originally Posted by [1ponders] View Post
They have an SCT thread on the end and not a T thread

Would they reach focus using a standard SCT to T adapter? (You know the straight one used to attach a SCT FR to a DSLR T ring adapter)
I've yet to try that, when Tony returns my SCT to T adapters (long & short hint for Tony).

The SCT ring is shown in the photo below. The Orion Star Shoot Deep Space CCD camera comes to focus using a 1 diagonal with the focuser racked out around 3cms of the 6cm travel.

Cheers

Dennis
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  #35  
Old 08-09-2007, 08:43 AM
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It would be interesting to try with a FR. They normally shorten the distance required to reach focus. Using the Mogg 1.25" reducer requires just over an inch of extra in focus compared to without the adapter and using the extension tube needs something like an extra 2.5 to 3" of infocus. Wonder what that WO 0.8 FR would do

How does it go with the SBIG and filter wheel Dennis? Reacon it will reach focus without the diagonal?
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  #36  
Old 08-09-2007, 09:39 AM
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i was looking into these cheap 500mm f8 lenses too... theres a kenko one thats f6.3 (i think) which is a bit faster and might be more woth the money than a no-name one. not going down that road now tho.
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  #37  
Old 08-09-2007, 09:47 AM
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Where did you see the Kenko one ving?
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  #38  
Old 08-09-2007, 09:59 AM
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http://cgi.ebay.com.au/New-Kenko-500...QQcmdZViewItem
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  #39  
Old 08-09-2007, 10:03 AM
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Cheers, thanks ving. Now can you explain to me why everything costs twice as much in England? Especially seeing as the lens is in Hong Kong
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  #40  
Old 08-09-2007, 10:18 AM
Dennis
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Originally Posted by [1ponders] View Post
How does it go with the SBIG and filter wheel Dennis? Reacon it will reach focus without the diagonal?
Not tried it yet. I'll try an auto guiding run tonight (weather permitting) with Gerald's STV (on loan) using the WO 66 and let you know.

Cheers

Dennis
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