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Recommend a refractor for imaging - around 500mm focal length


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I'm after a 4" triplet, something around 500mm/F5, with a good flat field and nice round stars.  Principally it will be used with a 28.4mm diagonal APS-C sensor, but would be nice if it delivered a wider flat field.

I was chatting to Jessen about the APM 105/650, with the 0.75x reducer, giving 487mm at F4.65, but unfortunately this scope is just out of my budget.

What would be your recommendation for a suitable scope?

 

Thanks in advance

Adam.

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11 minutes ago, vlaiv said:

The RIRED seems to be an excellent price on TS. Tempted to pick it up regardless. 
The M63 version has a slightly better spot diagram so likely just that one. 

Edited by tooth_dr
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I can't tell anything except that I would consider it for myself if I had the need / funds for it.

Haven't read or heard of any experiences with that particular model, but it does look to be quite ok scope.

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+1 for Esprit 80. I've had two for a few years now I was so impressed. Currently put the recently acquired ASI2600MC on one, very early days but so far clouds & moon look good across the field of view 🤣

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2 minutes ago, Sp@ce_d said:

+1 for Esprit 80. I've had two for a few years now I was so impressed. Currently put the recently acquired ASI2600MC on one, very early days but so far clouds & moon look good across the field of view 🤣

Unfortunately too short a focal length for me at 400mm, plus i changed from an 80mm scope so looking a  bigger aperture. I’m looking 500mm or close to this to mate up when my other 500mm scope on a dual rig. 

Edited by tooth_dr
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TaK Baby Q at 450mm 😁.. won't illuminate a FF tho. or the FSQ106 at 530mm 🤣

I looked at Sharpstar before I found my Esprit 150. The reason I ended up with two Esprit 80's is because I tried alternatives and like you, sent them back. I guess there's a reason why certain scopes come up time and time again in recommendations. Whats the 500mm you already have? If you're happy with that why not get another?

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7 minutes ago, Sp@ce_d said:

Whats the 500mm you already have? If you're happy with that why not get another?

Takahashi Epsilon 180ed, one of them in enough for any mortal. 

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3 minutes ago, Laurin Dave said:

Esprit100..  550mm  fl, 40mm diameter flat field ..  might be a bit heavy for a JTD saddle though ..  what happened with the Sharpstar? 

 

Just read you’re sending it back 

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17 minutes ago, Laurin Dave said:

Esprit100..  550mm  fl, 40mm diameter flat field ..  might be a bit heavy for a JTD saddle though ..  what happened with the Sharpstar? 

 

I have my Esprit 100 on a JTD saddle next to my Esprit 150 - no problem.

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Actually, I just ordered a second JTD saddle for my upcoming double RASA 8 rig. Still, I wonder why this seems to be the only adjustable double-rig saddle made.

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14 minutes ago, gorann said:

Actually, I just ordered a second JTD saddle for my upcoming double RASA 8 rig. Still, I wonder why this seems to be the only adjustable double-rig saddle made.

Mine’s piggybacked and uses shims for alignment..  but I have an OAG on the 150 otherwise there’s be nowhere for the guide scope 

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