You are not logged in. [Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar

Observing >> Solar Previous   Index   Next   Threaded

Pages: 1 dajebriza member Reged: 01/15/12 Loc: Germany PST Spectrum 60 From Denk - Compare to a SMII 60?       #5064985 - 02/10/12 07:18 AM Edit   Reply   Quote Quick Reply   I'm wondering about the price/performance value of the Spectrum 60 upgrade from Denkmeier. Since it is only $600 to upgrade a PST to a 60mm scope, compared to more than twice that for a basic SM II 60, what are the main performance differences between the two aside from the size of the blocking filter which you can upgrade on the SM II to get a larger field of view.. Is the Spectrum 60 a true 60mm scope, comparable to the SM II 60? What about the size of the Hypalon filter? Will it perform the same? I understand that not all PST's are created equal and there is a large performance gap between the best and the worst of the bunch. For the sake of this comparison, lets assume I have a "best of the bunch" PST. Post Extras:       David Knisely Postmaster Reged: 04/19/04 Loc: southeastern Nebraska Re: PST Spectrum 60 From Denk - Compare to a SMII 60? [Re: dajebriza]       #5065514 - 02/10/12 01:49 PM Edit   Reply   Quote Quick Reply   A friend of mine had his PST re-done to the 60mm aperture by Denk. Quite frankly, I was less than impressed. If anything, the contrast of the system was a little lower than that of the original PST, so I probably won't be going that route. My friend likes his 0.6 angstrom Daystar T-Scanner on his 9.25 inch SCT better than his "modified" PST. Clear skies to you. Post Extras:       seeker372011 scholastic sledgehammer Reged: 03/05/04 Loc: Sydney , Australia Re: PST Spectrum 60 From Denk - Compare to a SMII 60? [Re: David Knisely]       #5096946 - 02/29/12 05:36 AM Edit   Reply   Quote Quick Reply   I have a Spectrum 60 and quitte frankly am quite disappointed. I did a shoot out with a lunt 60 some months ago and reeled back in disarray at the huge difference Post Extras:       langejcarl sage Reged: 01/05/05 Loc: Michigan USA Re: PST Spectrum 60 From Denk - Compare to a SMII 60? [Re: David Knisely]       #5106163 - 03/05/12 09:40 AM Edit   Reply   Quote Quick Reply   Do you know if the one you looked through had been changed by Denk from a BF5 to a BF10? Post Extras:       seeker372011 scholastic sledgehammer Reged: 03/05/04 Loc: Sydney , Australia Re: PST Spectrum 60 From Denk - Compare to a SMII 60? [Re: langejcarl]       #5121346 - 03/14/12 05:46 AM Edit   Reply   Quote Quick Reply   I think it was a BF 10 but not sure..the scope is being checked out by a friend right now Post Extras:       TH1 Vendor (Denkmeier West Coast Rep) Reged: 07/24/10 Loc: CA Re: PST Spectrum 60 From Denk - Compare to a SMII 60? [Re: seeker372011]       #5209756 - 05/07/12 02:54 AM Edit   Reply   Quote Quick Reply   Denk 60 no longer supplies BF10 - PST manufacturing is too poor to support the BF. Stock BF works great. Can bino with corrector. Lunt needs barlow. Spectrum is way better deal. Now PSTs are going for $200 more now though. Post Extras:       highfnum Carpal Tunnel Reged: 09/06/06 Loc: NE USA Re: PST Spectrum 60 From Denk - Compare to a SMII 60? [Re: TH1]       #5209774 - 05/07/12 05:50 AM Edit   Reply   Quote Quick Reply   yes BF5 denk works great BF10 was the issue Post Extras:       poita member Reged: 07/25/11 Re: PST Spectrum 60 From Denk - Compare to a SMII 60? [Re: highfnum]       #5347667 - 08/01/12 08:45 PM Edit   Reply   Quote Quick Reply   I had a look at Seeker's scope, the problem was the 'BF10' supplied by Denk. It is not a genuine coronado BF10, and quite simply it doesn't work. Using the original BF5 or genuine BF10 the views through the Spectrum60 are great. Post Extras:       highfnum Carpal Tunnel Reged: 09/06/06 Loc: NE USA Re: PST Spectrum 60 From Denk - Compare to a SMII 60? [Re: poita]       #5348497 - 08/02/12 10:38 AM Edit   Reply   Quote Quick Reply   I had a few guys from the WAA club look thru PST 60 with BF5 they thought it was one of the best views thru PST they ever seen (larger size) Post Extras:       Corky scholastic sledgehammer Reged: 04/22/08 Loc: Ohio, USA Re: PST Spectrum 60 From Denk - Compare to a SMII 60? [Re: dajebriza]       #5350201 - 08/03/12 01:20 PM Edit   Reply   Quote Quick Reply   One problem with the Denk "upgrade" is that the inherently poor design of the PST focus device is not addressed. Post Extras:       brianb11213 Postmaster Reged: 02/25/09 Loc: 55.215N 6.554W Re: PST Spectrum 60 From Denk - Compare to a SMII 60? [Re: Corky]       #5350300 - 08/03/12 02:27 PM Edit   Reply   Quote Quick Reply   Quote: One problem with the Denk "upgrade" is that the inherently poor design of the PST focus device is not addressed. And neither is the fact that the PST etalon is manufactured to a tolerance which gives 1.0A passband. The Lunt etalons are 0.7A. That makes a lot of difference. Having said that, most are better than the specified tolerance, it is not unusual to find an occasional PST which has a 0.7A or better etalon. Post Extras:       Corky scholastic sledgehammer Reged: 04/22/08 Loc: Ohio, USA Re: PST Spectrum 60 From Denk - Compare to a SMII 60? [Re: brianb11213]       #5350440 - 08/03/12 04:13 PM Edit   Reply   Quote Quick Reply   Interesting; I wonder if the Lunt etalons are better than their nominal 0.7A specification? Post Extras:       brianb11213 Postmaster Reged: 02/25/09 Loc: 55.215N 6.554W Re: PST Spectrum 60 From Denk - Compare to a SMII 60? [Re: Corky]       #5350638 - 08/03/12 06:13 PM Edit   Reply   Quote Quick Reply   Quote: Interesting; I wonder if the Lunt etalons are better than their nominal 0.7A specification? In my experience, etalons (being hand finished) are all individuals, they vary quite a lote even within the same production batch. I'm lucky in so far as I have a "0.7A" single stack Solarscope SF-100 etalon which appears to have about the same bandwidth as some "0.5A" double stacked sets that I've seen. The manufacturer knew it was a good one when he sold it to me. Post Extras:       highfnum Carpal Tunnel Reged: 09/06/06 Loc: NE USA Re: PST Spectrum 60 From Denk - Compare to a SMII 60? [Re: brianb11213]       #5351296 - 08/04/12 07:05 AM Edit   Reply   Quote Quick Reply   "In my experience, etalons (being hand finished) are all individuals, they vary quite a lote even within the same production batch." I agree Post Extras:       bsim Carpal Tunnel Reged: 01/04/08 Loc: Miskatonic Re: PST Spectrum 60 From Denk - Compare to a SMII 60? [Re: Corky]       #5351338 - 08/04/12 08:18 AM Edit   Reply   Quote Quick Reply   Quote: Interesting; I wonder if the Lunt etalons are better than their nominal 0.7A specification? I knew my Lunt LS35 had great bandwidth, but didn't realize how good it was until I checked it against the single-stack Lunt scopes at the NEAF Solar Party. I thought an LS60 would always beat an LS35. Now, I don't feel any need to upgrade to an LS60. I'll save up for an LS80 PT. Post Extras:       Pages: 1

Previous   Index   Next   Threaded

Extra information 7 registered and 13 anonymous users are browsing this forum. Moderator:  Bowmoreman, KWB  Print Thread Forum Permissions       You cannot start new topics       You cannot reply to topics       HTML is disabled       UBBCode is enabled Thread views: 1417 Jump to *Announcements and News* -----   Cloudy Nights Announcements   Discussion of CN Articles, Reviews, and Reports   Celestial Events*General Astronomy* -----   Beginners Forum   General Observing and Astronomy   Outreach   Light Pollution*Equipment Discussions* -----   ATM, Optics and DIY Forum   Binoculars   Binoviewers   Cats & Casses   Classic Telescopes   Equipment   Eyepieces   Mounts   Observatories   Reflectors   Refractors    Video and Electronically Assisted Astronomy*Astrophotography and Sketching* -----   Beginning and Intermediate Imaging   Film Astrophotography   DSLR & Digital Camera Astro Imaging & Processing   CCD Imaging & Processing   Solar System Imaging & Processing   Sketching   Astro Imaging/Sketching Contest *Observing* -----   NEO   Planetary and Solar System Observing   Lunar Observing   Deep Sky Observing   Double Star Observing   Solar   Variable Star Observing and Radio Astronomy*Telescope Specific Forums* -----   Celestron NexStar    NexStar GPS / CPC Telescopes   Questar Forum   Meade ACF/RCX / LX / GPS    Meade ETX*Speciality Forums* -----   Arizona Science and Astronomy Expo   NEAF (Northeast Astronomy Forum) and NEAIC (Northeast Astro Imaging Conference)   AstroArt   Astronomy Clubs and Star Parties   Astronomy Software & Computers   AstroWebsites   Science! Astronomy & Space Exploration, and Others   Space Rocks   Stellar Media*Swap and Shop* -----   Shop and Swap Audio Components*CN Feedback and Vendor Announcements* -----   Vendor and Group Announcements*International Year of Astronomy 2009 - Forums are now closed.* -----   IYA Archive Info

CN Forums Home