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Tasco 304 Refractor

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#76 LDW47

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Posted 21 January 2019 - 03:37 PM

Do you see any evidence of gold/silver foil rectangular Passed sticker on the bottom side of the focuser housing? See ref pic.

Here is the pic of the underside of my scope !

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#77 LDW47

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Posted 21 January 2019 - 03:47 PM

Because of the softness, the flimsiness of the thin wood veneer on parts of the original case I am not going to use it to store the scope ! Even if you were / are very careful handling it one could easily destroy certain surfaces ! In some ways they weren’t built to last, it is one of the weakest parts of the whole kit in my estimation !



#78 LDW47

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Posted 22 January 2019 - 04:01 PM

I just recieved a hybrid diagonal that I ordered from Agena Astro so that I can use 1.25” eps in my new Tasco, this is a well built all metal piece of equipment with a great looking mirror all for $32 US + ship. One thing I have noticed with this scope that I would like to have verified is that when I insert either of the diagonals or an ep, for straight through viewing, into the ‘ eyepiece sliding sleeve ‘ there is no set screw that would securely hold them in place to prevent the diagonal from rotating in the sleeve when it was holding a heavy ep or either the diagonal / ep sliding back and falling out when viewing at a steep angle up to the zenith ? It looks like everything is held in place by friction only ? Can those that are a lot more familiar with these scopes verify this and if so have they had any problems ?



#79 JoeInMN

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Posted 22 January 2019 - 06:26 PM

I just recieved a hybrid diagonal that I ordered from Agena Astro so that I can use 1.25” eps in my new Tasco, this is a well built all metal piece of equipment with a great looking mirror all for $32 US + ship. One thing I have noticed with this scope that I would like to have verified is that when I insert either of the diagonals or an ep, for straight through viewing, into the ‘ eyepiece sliding sleeve ‘ there is no set screw that would securely hold them in place to prevent the diagonal from rotating in the sleeve when it was holding a heavy ep or either the diagonal / ep sliding back and falling out when viewing at a steep angle up to the zenith ? It looks like everything is held in place by friction only ? Can those that are a lot more familiar with these scopes verify this and if so have they had any problems ?

I have a vintage 50mm Tasco that has no collar or setscrew on the focuser or on the diagonal; their downstream barrels both have slits to friction-grip whatever is inserted into them. If your focuser has a collar with a screw-hole but no screw, then it's time for a trip to the hardware store.

 

post-252462-0-66189500-1509825869.jpg



#80 LDW47

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Posted 22 January 2019 - 07:42 PM

I have a vintage 50mm Tasco that has no collar or setscrew on the focuser or on the diagonal; their downstream barrels both have slits to friction-grip whatever is inserted into them. If your focuser has a collar with a screw-hole but no screw, then it's time for a trip to the hardware store.

 

post-252462-0-66189500-1509825869.jpg

There are no set screw holes anywhere on the scope, thats the reason for my post !



#81 LDW47

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Posted 22 January 2019 - 07:46 PM

I have a vintage 50mm Tasco that has no collar or setscrew on the focuser or on the diagonal; their downstream barrels both have slits to friction-grip whatever is inserted into them. If your focuser has a collar with a screw-hole but no screw, then it's time for a trip to the hardware store.

 

post-252462-0-66189500-1509825869.jpg

Friction fit is OK for those very lite 0.965” eps but when I start using the much heavier 1.25” eps especially a zoom lens it then becomes a different story ! I am sure others have had the same experience !



#82 DreamWeaver

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Posted 22 January 2019 - 07:49 PM

That's why the Vixen adapter is highly recommended if you plan on using 1.25" eyepieces.



#83 LDW47

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Posted 23 January 2019 - 09:15 AM

4550B70E-B75E-4666-ACC3-3B5DCE7B7BDF.jpeg

That's why the Vixen adapter is highly recommended if you plan on using 1.25" eyepieces.

What would be the advantage of the Vixen diagonal over this one ? As I mentioned this one looks as good as it gets unless I could have gotten the out of stock dielectric model !



#84 Garyth64

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Posted 23 January 2019 - 10:34 AM

That will work very well.  It looks very well made too.

 

The only thing for me is that it would force me to have to use the diagonal all the time if I wanted to use 1¼" eyepieces.  Which in itself is really not a problem, it's just that I like viewing straight thru when ever possible.


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#85 DreamWeaver

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Posted 23 January 2019 - 05:33 PM

attachicon.gif 4550B70E-B75E-4666-ACC3-3B5DCE7B7BDF.jpeg

What would be the advantage of the Vixen diagonal over this one ? As I mentioned this one looks as good as it gets unless I could have gotten the out of stock dielectric model !

It's not a diagonal.  It replaces the stock friction .965" diagonal/eyepiece holder, and uses a thumbscrew to secure a 1.25"diagonal/eyepiece.



#86 LDW47

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Posted 23 January 2019 - 06:02 PM

It's not a diagonal.  It replaces the stock friction .965" diagonal/eyepiece holder, and uses a thumbscrew to secure a 1.25"diagonal/eyepiece.

So it is for straight through viewing ? Can you send me a link ?



#87 LDW47

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Posted 23 January 2019 - 06:04 PM

So it is for straight through viewing ? Can you send me a link ?

 

It's not a diagonal.  It replaces the stock friction .965" diagonal/eyepiece holder, and uses a thumbscrew to secure a 1.25"diagonal/eyepiece.

How is it secured in the focuser tube, if it is just friction fit its the same issue only the whole assembly might slide out from the weight that I mentioned ? I must be missing something or not thinking right, lol !


Edited by LDW47, 23 January 2019 - 06:06 PM.


#88 DreamWeaver

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Posted 23 January 2019 - 06:07 PM

https://www.bhphotov..._to_31_7mm.html

 

It screws onto the focuser tube in place of the original slotted friction eyepiece holder.  Then you can use 1.25" accessories instead of the .965" pieces.


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#89 Garyth64

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Posted 23 January 2019 - 07:34 PM

Here's a comparison of the .965" VB to a 1¼" VB on matching Manons.  (there are only a few scopes that you can do this too)

 

comparing VB 1.jpg

comparing VB 2.jpg

 


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#90 LDW47

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Posted 23 January 2019 - 08:43 PM

Here's a comparison of the .965" VB to a 1¼" VB on matching Manons.  (there are only a few scopes that you can do this too)

 

attachicon.gif comparing VB 1.jpg

attachicon.gif comparing VB 2.jpg

Interesting and then if you want to go back to 0.965” eps you just switch everything back to the original ! Or is there an adapter to fit the smaller eps into a 1.25” diagonal ? The pieces are coming together in my mind !



#91 LDW47

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Posted 23 January 2019 - 08:51 PM

Another question I have is that when using these adaptors etc.in order to utilize 1.25” eps does it change the focusing characteristics of the scope and by how much ?



#92 Garyth64

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Posted 23 January 2019 - 09:16 PM

Another question I have is that when using these adaptors etc.in order to utilize 1.25” eps does it change the focusing characteristics of the scope and by how much ?

The two VBs are the basically the same height.  The only focusing characteristics that change will be from the eyepieces themselves.  You have enough travel in the focuser so you really don't have to worry about that.  Some of those old Huygens eyepieces focus inside the f.l.  More modern ones focus outside the f.l.  So all of that depends on your eyepieces.

 

If I want to use .965" eyepieces, I just screw in the .965" VB.  But that doesn't happen much at all.  But I do have a 1¼" to .965" adapter that I could use if I had to.


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#93 Stargoat

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Posted 23 January 2019 - 10:56 PM

When you use the 1.25" visual back you will be using a 1.25" diagonal which will have a longer light path along with the modern eyepieces. IIRC these older Tascos and similar scopes work well with 1.25" combinations. 

 

Also using a .965" to 1.25" adapter with the original visual back and 1.25" eyepieces that need a lot of of infocus will allow more flexibility. 


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#94 LDW47

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Posted 24 January 2019 - 12:48 PM

https://www.bhphotov..._to_31_7mm.html

 

It screws onto the focuser tube in place of the original slotted friction eyepiece holder.  Then you can use 1.25" accessories instead of the .965" pieces.

I just ordered one from B&H !


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#95 Garyth64

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Posted 24 January 2019 - 01:42 PM

That will work!

 

Your hybrid diagonal will also work fine too.


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#96 LDW47

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Posted 04 February 2019 - 12:26 PM

2D68728E-BBB4-4218-B6FA-83B5F8852341.jpeg                                         I bought this set of rings so that I could mount the scope on one of my AZ mounts to try it while I rehab the original wooden tripod ! They are exceptionally well built and fit perfectly with a little shimming, now when the weather co-operates ! Not bad for about $30 C incl ship. !


Edited by LDW47, 04 February 2019 - 12:30 PM.

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#97 LDW47

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Posted 18 June 2019 - 07:55 AM

Finally got to try the scope under less than favourable conditions but Jupiter and its moons looked as good as with a modern scope, unless you are a perfectionist or think you are and the stars were pin point ! Even some scopes from the earlier years were no slouches !  Used a Celestron Omni 32mm and an Agena SW 20mm ep’s to try it out !


Edited by LDW47, 18 June 2019 - 02:15 PM.

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#98 rogue river art

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Posted 18 June 2019 - 08:12 PM

I just bought a late 50’s early 60’s Tasco 304, 60mm, RO# 0461123 refractor in mint condition, in the mint wooden case from a lady up here in Canada for $150, I couldn’t resist as I have been looking for an older Tasco for a while ! Is that a good, fair price and is this year / model a decent representative of these older Tasco’s ? Anything I have read / reserched said they are ! Are ep’s for this scope available or are they scarce or should I convert it to 1.25” ? I believe it comes with a couple plus a barlow !

That scope looks exactly like my first scope that my Dad bought for me about 1958. Paid $100 for it. Couldn't afford a 4" Unitron.


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#99 LDW47

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Posted 14 August 2019 - 06:04 PM

My 304 mounted on my Celestron Omni waiting for the dark skies ! The original EQ mount is still being reworked ! The Omni is solid though, for now ! Put a 1.25” diagonal on it !

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