Guidecam recommendation advice please

[Ewan]

Hi,

I am after some advice on a new guide cam upgrade from my IS DMK""618.

I guide using an Altair Astro 60mm finder guider, it has a FL of 225 & is F3.75.

Lodestars, QHY 5L-II, ZWO's all keep being mentioned but which to go for ?

Could anyone share a guide shot of the sort of fov I could expect from a new camera against a DMK 618 fov ?

The DMK specs are  :- 640 x 480  Res     4.4mm x 3.8mm Sensor     5.6um Pixel size      Mono

Advice or links would be much appreciated.

Thanks

Ewan

 

PS it's a shame that I cannot use my PG G3 IMX174 as that has a big chip :-(

[red dwalf]

i use a 60mm altair non helical guide cam with a zwo 120mm camera, the resolution it produces is a good match for my william optics gt 81 with a 0.8 reducer and atik 460, sorry can`t help much more than that. 

[SkyBound]

The DMK that you have would be more than good enough, why do you want to upgrade...?

The DMK and ASI 120 are both 1/3" sensors... 

[Ewan]

1 hour ago, SkyBound said:

The DMK that you have would be more than good enough, why do you want to upgrade...?

The DMK and ASI 120 are both 1/3" sensors... 

The FOV using the DMK fov is very limited sometimes, on occasions there have been NO suitable stars shown in the field so I am looking for something that gives a larger fov.

[Ewan]

Or is there any guiding software that will use a Point Grey Grasshopper 3 cam that anyone knows of ?

[Magnus_e]

I use astronomy tools for FOV questions https://astronomy.tools/calculators/field_of_view/

Here is a screenshot with your gudescope and camera.

Your cam is red, yellow is QHY 5Lii m and green is QHY5 / Orion SSAG.

I use the SSAG and never have any problems finding guide star. My guidescope has a FL of 167mm.

[Arobinrice]

can you overlay a loadstar guide camera fov?

[Dixie]

I never fail to see plenty of guides stars with my DMK618 and 60mm finder. Not sure an upgrade will gain you much. Chip is pretty sensitive.