Astrophotography using a medium format camera

Started 4 months ago | Discussions thread
Pedro Oliveira Regular Member • Posts: 159
Re: Astrophotography using a medium format camera

Dear Parag.

Parag Shankar wrote:

Dear Pedro,

Greetings from India!


Thank you for your note about the LCD Live View zoom capability of 645z. Really appreciated.

I am glad to help.


I am new to MF camera studies and I am reading various reviews on it. I want o jump from APSC sensor to either FF or MF sensor for serious Astro research. So all these efforts.

In one of the many reviews, I read that the sensors of GFX 50S and 645z are different. The sensor size is also little larger. (very tiny increase). The pixel size also little larger for GFX 50S.

Here is the link. I would love to know your expert opinion on it.

Thank you for sharing your knoweledge. Best Wishes.

Regarding this subject, both cameras use the same Sony sensor IMX161 (as also Hasselblad and Phase One in some models). This sensor has become the “standard” medium format size in the industry.

However, each manufacturer is free to use the resolution they need.

Please see the following table where you can compare the sensors of each camera:

(Source: Dpreview)

As you can see, the sensor size is the same for the GFX-50S, 645Z and X1D but the resolution is slightly smaller for the X1D. But all use the same Sony sensor IMX161.

Just for the record, the 645Z was launched in March, 2014, so now is 5 years old and one should expect a new model very soon.

You said that you are evaluating the jump from APS-C to FF or MF.

I suggest you to have a look at the Pentax K-1 MkII (FF, 36MP) as it is specially suited for astrophotography. Pentax has a long tradition (since 2010) in this field with the Astrotracer mode where the Shake Reduction function (IBIS) is used to follow the earth rotation thus avoiding the star trails (within some limits).

Please see this article:

I hope it helps.

All the best.

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Pedro Oliveira - Portugal
Pentax user since 1984

 Pedro Oliveira's gear list:Pedro Oliveira's gear list
Pentax K-5 Pentax 645D Pentax Q Pentax K-1 II Pentax smc D FA 645 25mm F4 AL (IF) SDM AW +1 more
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