657 replies to this topic

[clamchip]

Frank it looks like the polished aluminum end may be close to falling

out, you better check it.

Its a press fit and usually it goes into the tube all the way to the shoulder.

 

Robert

[photiost]

Will do Robert.

 

Thanks.

[clamchip]

I installed the 7-Power today with a hose clamp at the traditional Edmund

"right in the middle" location. I'll give this a try but I think I like this location

and this finder best for the Edmund 5.

This is really a beautiful scope, its a fantastic lens, just like the Edmund

3 and 4 inch objectives.

The contrast, sharpness, lack of CA, beautiful natural colors, this is a lens

that puts a big smile on your face.

I was thinking today what a fine scope this would be for watching mountain

climbers in the Alps. Its very insensitive to changes in the site conditions, and

body heat with the lens way up there out of the way, and can go to extremely

high power and remain bright with its 5 inch aperture.

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[clamchip]

the close up

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[clamchip]

I remembered today that this finder and rings came from this tube!

This was a unfinished project newt from 1969.

Someone placed an order with Edmund for everything needed to

build a 6 inch f/8 Newtonian including the mount and pedestal.

The drive motor is dated Aug. 1969, thats how I know its from 1969.

I bought it from a school here in Seattle. It was never finished and sadly

the diagonal came unstuck from its spider platform and fell to the primary

destroying the diagonal and leaving a chip dead center on the primary, in

the shadow fortunately.

In this photo you can see the newt focuser location and the 4 holes for

the finder rings.

This tube is only temporary, I'll replace it with a new tube from Hastings Irrigation.

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Edited by actionhac, 24 January 2016 - 08:42 PM.

[TOM KIEHL]

Very nice Robert ,...... I got to say ,...... I Love That Focuser 

[PawPaw]

Heres the Burgess focuser I installed on the Edmund 5.

When I buy a new tube for the Edmund 5 it will be cut to

a longer length and I will use a Edmund focuser.

Robert,

I have an Edmund Off Axis Guider from the early 1980's that will fit Edmunds stock tubing in their catalog.  The 5" refractor lens in the cell that you have is part # 70,164 (Mounted in cell with 5 1/2" OD, 6 1/2" flange.  With adapter for mounting in 6 7/8" ID tubing) was designed for their 6 7/8" tubing.  I have owned this OAG for quite some time and just realized after following your topic here that the OD of the Off Axis Guider is exactly 6 7/8" inch.  I know the 5 inch Edmund lens and cell was cataloged way before this OAG was available but I have a hunch that Edmund had the OD in mind when they designed the OAG for  use on their stock tubing.  That said,  yes the OAG was designed for reflectors and available on their 4002 series reflectors but why wouldn't this focuser work on a refractor?  If you remove the focuser from the reflector turntable base it will work on a refractor.  Some adjustments will be needed on the rack and pinion travel for a refractor but I think Edmund had this in mind when manufacturing this OAG.   This is the later model OAG as can be seen in the picture.  Just some food for thought!

Edited by PawPaw, 26 January 2016 - 08:26 AM.

[PawPaw]

6 7/8" OD exactly:

 

 

 

 

 

 

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[clamchip]

That sure is a interesting focuser.

And the 6-7/8 inch diameter is the same as the Edmund 5 inch lens counter cell.

I would love to know what Edmund had planned for a possible larger refractor.

Also the Edmund "Extra Heavy Duty" mount's saddle was meant for a 7 inch OD tube.

 

I was looking back through some Edmund catalogs and ran across a ad for the

5 inch lens and noticed something I hadn't noticed before, 1961 ad states:

 

"effective aperture 4.73 inches, f/15".

 

That is the first time I have seen the 5 inch lens advertised in that way.

I'll measure the clear aperture of the cell and see if it is in fact 4.73". 

All the ads for this lens I have seen advertise it as a 5 inch f/14.2 which is

indeed what you get when you divide 5 inches into the 71" focal length. 

So this explains the odd 14.2 focal ratio.

 

Robert

[PawPaw]

I checked the 4 Edmund catalogs I own from Sept 1969, Sept 1970, Sept 1975 and Sept 1977.  All of the ads show the same FL of 71" for the 5" lens.   I also have a few pages in .pdf from a 1962 catalog and it also shows the FL of the 5" lens to be 71"

 

Diameter    Focal Length     Stock No.   Price,  Ppd

       5"              71"                *70,164         173.50

*Mounted in a cell with 5 1/2" OD, 6 1/2" flange.  With adapter for mounting in 6 7/8" ID tubing. 

 

The ad description from 1969 states:

 

"All these imported achromats are air-spaced, low-reflection coated on all 4 surfaces, and mounted in sturdy black metal cell with threaded retaining rings.  Lenses are precision ground, color corrected (for the C and F lines), and are free of coma and spherical aberrations.  Cells fit standard aluminum tubing (page 130).  If a yellow filter is used, these achromats are excellent for photography.

 

Here is a picture of my Edmund 5 inch lens in a non-Edmund aluminum cell.  I have tested the FL and it is 71". The aperture of this lens is 5" but inside the cell the retaining ring makes the effective aperture 4 7/8".

 

 

Don

 

 

 

 

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[clamchip]

That makes yours f/14.6 in the non-standard cell.

Does your lens have any edge markings or ink stamping?

[PawPaw]

That makes yours f/14.6 in the non-standard cell.

Does your lens have any edge markings or ink stamping?

Yes there is a number "12" on both Crown and Flint with corresponding arrows pointing towards each other. 

[clamchip]

I've decided the Edmund "7-Power" is the official finder for the Edmund 5 

and I'm going to mount it in the traditional Edmund "12 O'clock position" on

the tube.

Here's another finder that didn't make it into the finals, its off of my old

Hillbilly Superplanetary 6 inch f/13 newt.

I'm not sure what it is exactly, Edmund focuser, 60mm cemented coated

 objective of a fairly short focal length.

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Edited by actionhac, 26 January 2016 - 06:35 PM.

[clamchip]

In case you all are wondering what in tarnation a Hillbilly Superplanetary is here it is.

In the beginning it was the Hillbilly Superplanetary, thrown together with a ancient ebay

6 inch f/13 mirror with the name ALLEN scribed on the back.

Once it was realized what a potent instrument it was it was no longer a funscope but

a very serious scope and the name was changed to the Allenscope.

It has evolved into a very nice scope, and is fitted with lots of vintage Edmund parts.

This photo is from the those early days, the Hillbilly Superplanetary:

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[clamchip]

Here's the Allenscope today on the Edmund "Extra Heavy Duty".

I also use it as a long distance microscope around the garden.

I like observing insects, especially dragonflies and lady bugs

up in the treetops.

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[Joe1950]

6" F13! That tube covers two zip codes, Robert. Amazing!

[PawPaw]

My Edmund 4 inch was a little frosty this morning at 19 degrees but the sky was beautiful.  I was able to view all 5 planets this morning.  The best view of Mercury I have ever had.  The sun is coming up now and I left the Edmund out to slowly warm up.

 

 

 

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[clamchip]

Here's a ad I cut and pieced together for the sensational Edmund achromatic objectives.

1962 prices.

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Edited by actionhac, 28 January 2016 - 05:42 PM.

[TOM KIEHL]

Here's a ad I cut and pieced together for the sensational Edmund achromatic objectives.

1962 prices.

 

You'll have to listen to THIS when you read that ad , Robert .

[clamchip]

I have a new focuser on its way, this one here for 6-7/8" tube so

it will fit directly just like downtown, and not need my mirror cell

adapter plate.

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[clamchip]

That photo is from my 1970 catalog delivered to me when I was 13

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Edited by actionhac, 03 February 2016 - 12:29 PM.

[clamchip]

 cartoon on the order form, and the order form didn't get sent in

so I didn't buy anything that time.

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Edited by actionhac, 03 February 2016 - 12:33 PM.

[Bomber Bob]

Memory lane... I never bought anything from Edmund or Jaegers that I wasn't happy with - including the weird surplus lenses & such.  My forays in eyepiece design were a bust, but at least the glass didn't cost too much!

[Chuck Hards]

I have a new focuser on its way, this one here for 6-7/8" tube so

it will fit directly just like downtown, and not need my mirror cell

adapter plate.

 

I'm guessing it's going to look something like this.

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[clamchip]

Wow Chuck I'm going to start praying right now that it has that much

focuser travel.