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Old Wednesday 10th May 2017, 21:28   #26
jring
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Hi,

edge performance is not usually related to prisms (except maybe vignetting due to too small prisms).

The shape of the device implies Schmidt-Pechan prisms - due to the small aperture and the slow focal ratio in comparison to binocular objectives, prisms from those could be used...

Joachim
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Old Thursday 11th May 2017, 15:17   #27
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With this version of IS I think that the maximum aperture is 30mm.
Maybe improved versions or different systems could be used with larger apertures.

The Canon 8x25 IS uses a different IS system to the larger Canon IS binoculars.
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Old Thursday 11th May 2017, 17:15   #28
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The edge performance is definitely field curvature and can be refocused. How many diopters difference seems to be more of the issue. Apparent sweet spot size with this eyepiece is approximately 75%.

Close focusing distance for my eyes with this eyepiece is approximately 8 feet.

Let me know if there are any other questions.
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Old Thursday 11th May 2017, 18:01   #29
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Hi Frank,

thanks again for the info - seems like I will try to get one when available...

Joachim
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Old Thursday 11th May 2017, 23:11   #30
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Quote:
Originally Posted by FrankD View Post
Close focusing distance for my eyes with this eyepiece is approximately 8 feet.

Let me know if there are any other questions.
With the zoom in place you can get a good macro effect at 20X @ 8 feet, i guess...
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Old Friday 12th May 2017, 08:59   #31
pete_gamby
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Web pages now uploaded:

http://www.opticron.co.uk/Pages/mms_travelscope.html

http://www.opticronusa.com/Pages/mms_travelscope.html

Stock has been going out to dealers this week.

HTH

Cheers, Pete
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Old Friday 12th May 2017, 13:36   #32
jring
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Hi Pete,

thanks for the info - since I haven't found a dealer for your products over here in germany yet (preferably near Frankfurt), I assume mail order directly from you is an option too?

And while we're at it, you asked if there was interest in an astro adapter for the SDLv2 zoom some time ago - has this materialized? If yes, I'd like one in the package...

Joachim

Last edited by jring : Friday 12th May 2017 at 16:28. Reason: speling
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Old Friday 12th May 2017, 14:46   #33
Binastro
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Would MMS 160 work with 40933 HR2 eyepiece?
If yes, what are magnifications?

P.S.
I also have a Japan eyepiece in the old grey box marked 20-60x D=60. 16-48x D=50.
The eyepiece is marked ZOOM 50S in green and 60S in red with 18x 48x in green letters in the window and 20x 60x in red letters in the window.
But no makers name.
It is smaller diameter than the HR2 with a smaller attachment.
It may be Opticron.

The smaller eyepiece seems to have the wider apparent field at the highest magnification, but a considerably smaller field at the lowest magnification. Maybe the smaller eyepiece focal lengths are smaller?

It may be that the HR2 eyepiece can be used on the MMS 160 with an adapter.
What about the smaller ZOOM eyepiece?

Last edited by Binastro : Friday 12th May 2017 at 15:07.
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Old Friday 12th May 2017, 15:01   #34
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Binastro,

I couldn't find anything to that effect on the Opticron's MMS 160 page but I do remember reading it somewhere. I will see if I can find it.

Edit:

Found it. Listed as HR instead of HR2 but it shows 8-24x.
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Old Friday 12th May 2017, 15:58   #35
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Thanks Frank.
8x to 24x would be useful but dim at 24x. It may need an adapter.

Yesterday I tried the 60 to 80 year old Broadhurst Clarkson HAWK 18x 23.5mm black leather drawtube scope with 3 drawtubes. 6 inches long collapsed.
It is very dim even in sunshine.
But it it is dirty inside, probably never cleaned. Also the relay lenses, eyepiece and objective are all uncoated.
No CA. Field only about 1.6 degrees.
It is really unsteady as it is too small to balance properly. The long drawtube scopes are much steadier.

The rear tube unscrewed makes a 30x magnifier. The bigger versions are much brighter and 20x.

The coated MMS 160 will be a brighter scope.

Last edited by Binastro : Friday 12th May 2017 at 18:21.
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Old Friday 12th May 2017, 19:07   #36
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Binastro: I was initially surprised by the field of view numbers for zoom eyepieces, but it seems that in general zooms are not par-focal with magnification and that the apparent field of view is smallest at low magnification. The one exception I've used is the Nagler 3mm-6mm zoom which has fairly consistent 50 degree apparent field and is par-focal over the magnification range.

Pete: Good news. I'm looking forward to trying out the MMS 160. I noticed that B&H has it up on their site with a 7-14 day availability.

Frank: Have you tried it with zoom eyepiece? How effective is IS and how is brightness at say 15x?

Thanks,
Alan
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Old Friday 12th May 2017, 19:27   #37
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Joachim - yes, you can order from us but a better option might be to order by phone from our German distributor Vendemos (vendemos.eu). They don't have stock or samples yet but I'm sure they would be happy to help.

I can make sure to send the 1.25" adapter - it didn't really work as a project to be honest but you are welcome to try one for me :-)

Cheers, Pete
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Old Friday 12th May 2017, 19:28   #38
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Alan,

I did try it briefly with the SDL V2 but not the HDF. I will use both more extensively over the weekend and let you know.

I can say I was very pleased with the IS at 11x with the HDF fixed mag eyepiece.
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Old Friday 12th May 2017, 21:48   #39
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Hi Alan.
It is to be expected of zoom eyepieces as the field is determined by the field lens.
At say 8mm fl the apparent field can be large, but at say 24mm fl it will be small unless the field lens was very large.

Nagler tries hard to have parfocal eyepieces but this is an extra constraint that others forget about.

I have the Nagler 3mm-6mm zoom and it is very good. It deliberately has a medium field to maintain quality.
With such small focal lengths it is easy to maintain the field size.
Also I use some 82 degree eyepieces. These help a lot with fixed tripods. Some are over 30 years old now.

Last edited by Binastro : Friday 12th May 2017 at 21:54.
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Old Monday 15th May 2017, 16:55   #40
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Alan,

I did try the MMS 160 with the HDF zoom this weekend extensively....and just now I set it to 15x to specifically answer your questions.

I did not find the brightness levels objectionable. I wouldn't call it "bright" but I wouldn't call it "dim" at that particular setting either. The IS works well all the way up to 21x.
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Old Tuesday 16th May 2017, 04:17   #41
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Frank,

Thanks for taking the time and providing the data. The brightness is what it is with only a 26mm objective at 15x. I'm glad to hear you find the IS effective all the way up. Now I just have to find someone who has it in stock.

Thanks Again,
Alan
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Old Tuesday 16th May 2017, 12:53   #42
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Alan,

Good luck with that at the moment.

I was told that stock wouldn't be arriving in the US until closer to the end of this month.
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Old Tuesday 16th May 2017, 15:58   #43
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Hi,

interesting news - the new german distributor has just answered after I mailed him yesterday, the offer sounds good and promises a speedy delivery. I agreed and am waiting for payment details...

Will let you know when it's in my hands and I can take it for a test drive with the SDLv2. I'm especially interested in how well the field flattener in the SDLv2 can cope with FC in such a short focal length instrument - in my Kowa it's pinpoint stars to the edge - but at 2.5 times longer focal length...

Joachim
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Old Wednesday 17th May 2017, 21:39   #44
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Bit more aperture would give a brighter image, but like my 12x35 which is my "one device" selection when
I don't want scope and bins. Which of the opticromnlenses has the greatest apparent field of view... I don't like looking down a long thin tube.

PeterW
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Old Wednesday 17th May 2017, 23:33   #45
jring
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Bit more aperture would give a brighter image, but like my 12x35 which is my "one device" selection when
I don't want scope and bins. Which of the opticromnlenses has the greatest apparent field of view... I don't like looking down a long thin tube.

PeterW
Hi,

see this table of focal length and afov information for most Opticron EPs (and bodies). The latest models might be missing though...

http://www.birdforum.net/showthread.php?t=326955

Joachim
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Old Thursday 18th May 2017, 03:42   #46
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Alan,

Good luck with that at the moment.

I was told that stock wouldn't be arriving in the US until closer to the end of this month.
I heard the same timing from Michaela at Opticron USA. I just ordered it from B&H. I figure they will get stock as soon as anyone, and I've had good luck doing business with them.
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Old Thursday 18th May 2017, 13:10   #47
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Nice Alan. I look forward to reading your comments once you receive it.
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Old Thursday 18th May 2017, 17:17   #48
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I got an email this morning from B&H that the MMS 160 will be shipped directly from Opticron in NC when available. I will report back when I have it in hand.
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Old Friday 19th May 2017, 14:39   #49
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Cool. You can't get it too much faster than that.
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Old Tuesday 23rd May 2017, 14:49   #50
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The price in the Uk is recommended 299 for the body so possibly likely to see it for sale around 280. The body weighs just 11 ozs and is 4.5 inches long.
I have been using the Acuter 8-24mm 20x-60 eyepiece which weighs 7 ozs and makes the scope plus EP 8 inches overall. This zoom costs 66 so I'm impressed with the instrument and esp at 346 complete.
Have been comparing it with my Canon 10x30IS and the image stabilising is the same.
Even at full zoom the 26mm OG is bright enough. Not used at dusk yet. The judder occurs if you hesitate when switching on the IS . I shall try it out on the boat but it is not water proof, nor is the Canon 10x30 IS which I have been using on my boat for many years. Just have to be careful.
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