201 replies to this topic

[kel123]

Like this one.

https://www.highpoin... 3 mm of length.

There are others. What I can not tell is the compatibility of your optics with reducer.

[emr7]

Is this what I need to attach T3i to the 61edph II?  and what about filters?

 

https://www.amazon.c...&language=en_US

[Cometeer]

Is this what I need to attach T3i to the 61edph II?  and what about filters?

 

https://www.amazon.c...&language=en_US

It would be ideal to get an Canon to M48 tring so you can directly thread it on. The link you shared is Canon to M42 (M42 = T2). 
 

You can place clip-in filters in your dslr or a 2” filter in the flattener. 

[emr7]

so something like this

 

https://www.amazon.c...D9ZVV6413YJW4EV

 

 

It would be ideal to get an Canon to M48 tring so you can directly thread it on. The link you shared is Canon to M42 (M42 = T2). 
 

You can place clip-in filters in your dslr or a 2” filter in the flattener. 

[Cometeer]

so something like this

 

https://www.amazon.c...D9ZVV6413YJW4EV

Yep

[gnarayan]

I got a variable M48 extension tube and a Baader M48-Sony E adapter to fiddle with the backspacing.
Finally had a clear night in central IL to try it. I find it's about 53mm for my copy of the FR WITH a H alpha filter in the FR extension.
Was limited to about 2 hours of exposure because trees get in the way in my backyard, but reasonably happy with the results now that the corners are OK:

 

 

[UKalwayscloudy]

Useful to know what that distance. I find these adjustable extensions invaluable for getting the right distance and it’s quite often a bit away from official spec.

[paulsky]

It seems that it is more a refractor for astrophotography than for visual, right?
Paul

[emr7]

Just received it today, looks good, but curious anyone know where to find a Bahtinov Mask that fits it?

?

[gnarayan]

Just received it today, looks good, but curious anyone know where to find a Bahtinov Mask that fits it?

?

Amazon has an astromania one for 85mm-120mm which I got for another telescope but also works just fine for the 61 edph.
This thing: https://www.newegg.c...079-04UR-00001#

Edited by gnarayan, 17 September 2020 - 08:04 PM.

[UKalwayscloudy]

It seems that it is more a refractor for astrophotography than for visual, right?
Paul

Just fine for visual. Was using it to view the comet with the kids a few weeks ago with a Baader diagonal and zoom
Eyepiece. It’s not an Astrograph only kind of scope.

[gonzothegreat]

How far out the drawtube comes out please to reach focus?

[gonzothegreat]

This is with the flattener/reducer made for the 61, it’s 11.5 inches total. The flattener has a barrel you can take off the glass cell that cuts it down to 9 inches in length.

What does removing the barrel do really? Does it affect the f ratio or else please?

[chongo228]

What does removing the barrel do really? Does it affect the f ratio or else please?

The barrel is just a spacer. If you remove it you can just attach your own. It's probably two pieces because it's easier to machine that way. The only reason to remove it is to go to your own thread size or spacer.....doesn't change the f-ratio....it's just a metal tube.

[gonzothegreat]

I currently own an old Mergrez 72 with a Baader steeltrack focuser on it, it's f6.0

Do you think that 61 EDPH would beat it in terms of overall performance? Assuming I use the same mount, imaging train (same CCD, guider etc...)?

[F.Meiresonne]

I currently own an old Mergrez 72 with a Baader steeltrack focuser on it, it's f6.0

Do you think that 61 EDPH would beat it in terms of overall performance? Assuming I use the same mount, imaging train (same CCD, guider etc...)?

No

 

I don't think so.

 

One would use an 61 EDPH just to get a bigger FOV.

 

Unless the 72 megrez uses an FPL51 doublet ,that i don't know. I see it has a ED designation...

 

Then again the current 61 mm EDPH that is sold is a triplet...

 

But still i guess the benefit of this scope is FOV.

 

If you want to replace the 72 Megrez I  think an 76 mm EDPH triplet  is a better choice, with FF/FR, comes with a price off course

Edited by F.Meiresonne, 24 September 2020 - 03:30 PM.

[UKalwayscloudy]

Finalised my connection to the Altair Hypercam 269c and sorted out the guide scope. As with the Nikon the 269c is running off the Baader UFC system that connects to the M63 thread in the middle of the reducer, with the standard back of the reducer removed. The Guidescope now connects via an Arca Swiss clamp to a small dovetail where the handle was. So I can swap that guider between my Nikon L bracket and here as needed. It all balances nicely with the longer Vixen dovetail at the bottom. 

 

The 269c is a 4/3 sensor with 3.3micron pixels, so while it does not take advantage of the full frame illumination the high pixel density gives some reach. Someone asked about CA a while back and even with the smaller pixels I'm only seeing some mild halos easily killed in Light Room. Shot of Andromeda in next post. 

Attached Thumbnails

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[UKalwayscloudy]

500k limit does not do justice to the detail, but here it is: SS61EDPH2 + Hypercam 269c. I am in Bortle 4-5. This was about 40 @180s stacked in APP and the fed through PI.

Attached Thumbnails

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Edited by UKalwayscloudy, 25 September 2020 - 11:01 AM.

[gonzothegreat]

Finalised my connection to the Altair Hypercam 269c and sorted out the guide scope. As with the Nikon the 269c is running off the Baader UFC system that connects to the M63 thread in the middle of the reducer, with the standard back of the reducer removed. The Guidescope now connects via an Arca Swiss clamp to a small dovetail where the handle was. So I can swap that guider between my Nikon L bracket and here as needed. It all balances nicely with the longer Vixen dovetail at the bottom. 

 

The 269c is a 4/3 sensor with 3.3micron pixels, so while it does not take advantage of the full frame illumination the high pixel density gives some reach. Someone asked about CA a while back and even with the smaller pixels I'm only seeing some mild halos easily killed in Light Room. Shot of Andromeda in next post. 

 

Could you please measure the length from the telescope hood (fully extended) to the back of the camera?

[UKalwayscloudy]

465mm as in the picture from far left to far right. It's only approximately at infinity focus as I was messing about indoors. The focuser extends about another 20mm. 

[gnarayan]

30 x 300s @ ISO 2000 w/ dualband HI, OIII

It's really impressive how sharp this scope is edge to edge, even with full frame.

Edited by gnarayan, 25 September 2020 - 06:21 PM.

[gonzothegreat]

The two main issues I have with my Megrez 72, hence I'm looking to change it.

#1 To achieve focus I really need to get the drawtube way out of the focuser (I do have a 1.0x flattener).

#2 Despite the Baader focuser, the drawtube is moving up and down badly, sure it could be maybe adjusted

 

I do like what I see and read about the 61EDPH and I like that all the connections are solid, not using the compression ring that you usually see, this one has a threaded connections.

And it's f4.5 instead of my current f6.0

 

For those with this scope and the dedicated flattener, when you achieve focus, how far out the focuser comes out please?

Edited by gonzothegreat, 26 September 2020 - 01:36 AM.

[UKalwayscloudy]

Comes out to just over 1cm to achieve infinity focus from full in. It can come out quite a bit more and so Infinity focus is to the short of if middle of the focus range. I hope that it what you meant. The multiple threaded connections certainly help.

[gonzothegreat]

Comes out to just over 1cm to achieve infinity focus from full in. It can come out quite a bit more and so Infinity focus is to the short of if middle of the focus range. I hope that it what you meant. The multiple threaded connections certainly help.

That's exactly what I meant, thanks for the input.

 

Wow, what a difference with my Megrez, here's a picture of it, I need about 6cm out to reach focus

And I think this is causing quite some droop on the drawtube...

 

check out the red line ^

 

 

That 61 EDPH is really tempting now  

[F.Meiresonne]

It is a fine scope, IMO, even the doublet version, at least for my purposes...