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Equipment Discussions >> Refractors

Pages: 1
Ed Whitney
sage


Reged: 07/08/10

Loc: Palm Coast, Florida
SV F60M2 Finder Scope
      #5562185 - 12/09/12 10:52 AM

Hi, Does anyone have any experience using this finder?

The thing I am most concerned about is, are the stars at the edge of FOV in sharp focus like the center? Or, is there any issue here because the scope is a fast F/3.75?

And what was the faintest magnitude you were able to see? Is the brightness level of the scope adaquate, because it uses a prisim instead of a diagonal?

Thanks


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desertlens
professor emeritus
*****

Reged: 12/06/10

Loc: 36N 105W
Re: SV F60M2 Finder Scope new [Re: Ed Whitney]
      #5562240 - 12/09/12 11:22 AM

Ed,
I use an SV60 finder on my 80mm scope for observing rather than finding. Long story short... with orthos. I tried a number of wide field EPs, including a 19mm Panoptic and was disappointed with the edge of field performance. The performance of this scope and the orthos came as a surprise to me, very clean across the whole field. At present it contains an 18mm BGO + a Baader M&SG filter that basically lives there. The filter helps to tame the background a bit at these exit pupils. Brightness is not an issue. I used this setup last night to observe the entire sword of Orion and have used a 25mm UO Abbe with an OIII filter to see the entire Veil nebula. Just a technical note: The UO orthos in 18 and 25mm FLs will need a bit of help to come to focus. I use parfocalizing rings to accomplish this. This isn't necessary with the BGO or any of the other UOs. I'm uncertain of the limiting magnitude but it should be comparable to any 60mm binoculars.


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tomharri
sage
*****

Reged: 09/19/08

Loc: USA
Re: SV F60M2 Finder Scope new [Re: desertlens]
      #5562298 - 12/09/12 11:50 AM

The one I had was so bad the stars looked like seagulls. Trying higher power lenses just made everything worse.

But, on ebay, Russel Optics sells a 60mm binocular part with the exact same lens diam., same f/L, same thickness, same blackened edge......BUT this one performs like you had hoped the overpriced S.V. shoulda.

Sure you gotta cut the lens outta the housing, all glued together, but it is worth it at $24.95 to salvage this 60mm mess.


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desertlens
professor emeritus
*****

Reged: 12/06/10

Loc: 36N 105W
Re: SV F60M2 Finder Scope new [Re: Ed Whitney]
      #5562318 - 12/09/12 12:03 PM

Just for grins, here's an old photo. The mount has changed but you get the idea.



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Ed Whitney
sage


Reged: 07/08/10

Loc: Palm Coast, Florida
Re: SV F60M2 Finder Scope new [Re: desertlens]
      #5562361 - 12/09/12 12:29 PM

Oh Man! Back to square one! I kind of had a feeling the "F60M2" might have had a problem with edge focusing. Geez, I DO appreciate your sharing the info, good and bad.

I had the SV50 in white and it looked and worked, basically "ok", but did think the image was a tad on the dark side. Guesss I'm used to ED glass!

Desertlens, I can hardly follow what you are saying about the UO eyepieces and filters you mention, but will study this a bit more before getting any finder. And, that is ONE sharp looking rig! I'm not grining, just jealous!

Tomharri, How DID you figure that out, with swapping lenses! Not bad! I like to tinker, but, oh man!

Almost looks like the Orion 9x50 RACI finder #7020 for $130 might just save the day!


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desertlens
professor emeritus
*****

Reged: 12/06/10

Loc: 36N 105W
Re: SV F60M2 Finder Scope new [Re: Ed Whitney]
      #5562448 - 12/09/12 01:15 PM

Ed, My experience was nowhere near as bad as Tomharri's. Much of my problem turned out to be related to widefield EPs. The center was fine but off axis things got pretty bad. The Orthos have a narrower Apparent FoV (40-45) and this clearly resolved my issues. The True FoV with an 18 is 3.6 and the 25 is 5.2, still wide by most standards and consistent with the usual finder field. Good luck and have fun.

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Ed Whitney
sage


Reged: 07/08/10

Loc: Palm Coast, Florida
Re: SV F60M2 Finder Scope new [Re: desertlens]
      #5562903 - 12/09/12 06:22 PM

Craig, Yeh, you're right about wide-field and fast scopes. I learned this lesson years ago, they always show blurriness and color fringing. Thanks for helping me decide this.

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dlapoint
scholastic sledgehammer


Reged: 08/18/03

Loc: Moncton NB Canada
Re: SV F60M2 Finder Scope new [Re: Ed Whitney]
      #5563401 - 12/10/12 12:22 AM

I find this makes a better telescope than a finder. You can't see the cross hairs and it is real heavy next to a 50mm finder.

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Richard Low
professor emeritus
*****

Reged: 11/27/05

Re: SV F60M2 Finder Scope new [Re: dlapoint]
      #5563429 - 12/10/12 01:00 AM

I would like to let you guys know that I have great performance with my SV F60 finder using Pentax XW 14mm; to my eye it is sharp to the edge.

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Ed Whitney
sage


Reged: 07/08/10

Loc: Palm Coast, Florida
Re: SV F60M2 Finder Scope new [Re: Richard Low]
      #5564601 - 12/10/12 05:52 PM

Thank You Derek and Richard! I DO appreciate the continued posts.

This is the info I was sort of hopeing for! If I get this scope, I might just be allowed to join the venerable, "60mm Club"!

Best to you ALL


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lamplight
Carpal Tunnel
*****

Reged: 09/18/12

Loc: western MA, U.S.
Re: SV F60M2 Finder Scope new [Re: Ed Whitney]
      #5672098 - 02/10/13 10:24 AM

Just came across this. I absolutely love the f60m2. I use it as a finder but also enjoy its views on its own. I never bothered to check the sharpness full field (have only ever used stock EP as felt no need), but I'always appreciate the pinpoint sharpness of e view.. Honestly just haven't looked to the edge of the field with a critical eye. Hmm.. I guess if it was mainly used as a scope i would have of course.. I just got the straight through version for my DOB but haven't used yet.

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Pete-LH
sage
*****

Reged: 03/25/09

Loc: Wilmington, DE
Re: SV F60M2 Finder Scope new [Re: lamplight]
      #5672312 - 02/10/13 12:44 PM

Thanks for posting. I've have the 50mm version and wanted to get the 60mm to use with my 5" AP Superplanetary. I've been using a straight through finder but would appreciate the 90 Degree and RACI function at Zenith. I really like the separate x-hair and lens focusing function. I've just held off because of the negatives here and a previous thread. Plus I've been waiting a long time for an answer on a problem I had with on of their x-hair wide field lenses where the reticle fell out.

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