Esprit 120 - flattener & reducer?

[Neil27]

Curious to know, is a flattener and reducer required when using with an esprit 120mm.

Just working out costs for my imaging train.

Thanks,

[Laurin Dave]

You'll need either the 1x flattener or the 0.77x reducer/flattener  with that, depends on what camera you have /fov / sample rate you want  ...  £196 or £299..  

[SamAndrew]

I'm sure I've seen comments that you can get away without the flattener at all - although I can't confirm the sensor size that was being used. You might not need one for a 4/3 size chip such as the ASI 1600.

[Laurin Dave]

6 minutes ago, SamAndrew said:

I'm sure I've seen comments that you can get away without the flattener at all - although I can't confirm the sensor size that was being used. You might not need one for a 4/3 size chip such as the ASI 1600.

Yes...  that what I was told for a chip the size of an Atik460.. 

[Neil27]

5 hours ago, Laurin Dave said:

You'll need either the 1x flattener or the 0.77x reducer/flattener  with that, depends on what camera you have /fov / sample rate you want  ...  £196 or £299..  

Hi thank you for the reply @Laurin Dave

I was going to get an Atik horizon but after reviewing my choice and learning of the QHY 268c I think that will be my preferred option.

So just to recap I don’t need a flattener just a reducer for my esprit 120 with the QHY 268c?

Thsnks, 

[Laurin Dave]

Neil, you need either the flattener or the reducer (which also flattens) ...  if it were me I'd get the reducer to go with that scope and camera, it will have a fov 1.7 times as big (and will get all of M42 Running Man etc) still have a good pixel scale of 1.2 arcsec/pp which is fine for galaxies and will also be a faster system..  Maybe trickier to get backfocus set up but QHY do a very good set of spacers for this purpose..  

HTH

Dave

[Neil27]

Thanks Dave,

My thoughts exactly. Thanks for the advice, appreciated.

[Laurin Dave]

You’re welcome..  I have two of them a 100 and a 150 both great scopes and thinking about getting the reducer for the 150.. 

[Adam J]

On 04/02/2021 at 17:03, SamAndrew said:

I'm sure I've seen comments that you can get away without the flattener at all - although I can't confirm the sensor size that was being used. You might not need one for a 4/3 size chip such as the ASI 1600.

You would need one, maybe a small sensor like in the ATIK428 etc but not much bigger than that before you need one. Even something like a ASI183 would need one.