ZWO 2'' Filter Drawer (M42 / M48)
ZWO 2'' Filter Drawer (M42 / M48)ZWO 2'' Filter Drawer (M42 / M48)ZWO 2'' Filter Drawer (M42 / M48)

ZWO 2" Filter Drawer (M42 / M48)

  (15 Reviews)
✓ 2 year warranty


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About this product

Model:  zwo_fd_m42
Part Number:  ZWO-FD-M42-II

New ZWO 2" Filter Drawer (M42)

This useful 2" filter drawer features M42 / 0.75 external thread (camera side),  M48 / 0.75 internal thread (telescope side) and M48 / 0.75 internal thread filter drawer. 

Two strong magnets hold the drawer firmly in place for easy installation and a locking screw firmly secures it.


  • 2" Filter Drawer
  • Two strong magnets and a locking screw hold the filter drawer in place
  • Easy to install and use
  • Supplied with an M48 to M42 adapter

Mechanical Drawing


M42 * 0.75 external thread (camera side)

M48 * 0.75 internal thread (filter end)

M48 * 0.75 internal thread (telescope side)

Suitable for use with 2-inch astronomical filters

Customer reviews

Average Rating (15 Reviews):  
Write a Review and share your opinions!

Rating (max 5):  
Time saver
14 November 2022  | 

Great piece of kit to save time when imaging. Slotting in and out filters for my OSC camera without removing field flattener and reducer, saves so much time and you don’t have to refocus and hope the optical train has been affected. Great service from FLO.

Rating (max 5):  
Great! Makes life a lot easier if you only use 2 or 3 filters
31 October 2022  | 

This is the second filter drawer I've bought. Using this on my portable/wide-field setup whilst the other one is on my main rig. I thought I could get by just screwing filters into telescope, but then you have to mess about with focus, back focus etc. This is 100x easier and saves the expense of buying 2 sets of filters. I don't have the issue others have described of the filter holder falling out- the only time it comes loose is when I knock it if I'm adjusting something. Once left alone on the telescope there is no reason why it should ever fall out during normal operation.

Rating (max 5):  
Good quality, does the job well.
01 October 2022  | 

I have a few 2in filters (colour and mono) but not sufficient to warrant a 2in filter wheel. 2in filters will usually screw directly onto coma/field correctors but this is not ideal so I bought this item together with an extra holder. It seems well made and very solid. Some people have remarked that the holder can fall out. I have not found this to be the case. There a 2 magnets and also a small Allen bolt on the drawer that can secure the holder, so there are 3 points of closure. The Allen bolt locates into a tiny hole on the holder when in use. The bolt can be adjusted so that the holder will click into place with a small amount of pressure and is then extremely solid. This also allows release with a small pull without having to readjust the bolt. Not sure if the bolt is a new addition, but I found no issue with filter holder falling out.
The only quibbles I have are that the 2in holder is not a 1-1 replacement for a filter wheel as, although it has the same thickness (21mm), it has a male and female thread whereas filter wheels typically have female thread front and back so you may have to reconfigure your optical train slightly to get the correct back spacing. Also the M48-M42 converter at the telescope end does not have a stop position so if you are using 3rd party T2 spacers (eg Astro Essentials) these can screw all the way in and fall inside the filter drawer. This is not an issue when using official ZWO camera rings which are much wider and screw flush with the holder body. All in all a well made item that does the job.

Rating (max 5):  
Great Filter Drawer
09 July 2022  | 

Filter drawer seems to operate fine , slightly concerned about strength of magnetic hold but time will tell. Fantastic service from FLO .

Rating (max 5):  
ZWO filter drawer
20 January 2022  | 

Useful gadget (for OSC) which removes the need to dismantle the optical train to swap out a filter without buying a full on filter wheel.

The magnetic closure could be stronger. I use a hair band to ensure it stays closed but still need to check it after a meridian flip... Hence 4 stars.

Rating (max 5):  
Works well
23 November 2021  | 

Not much I can add to the other comments except to say that I fixed a velcro strip around the detachable drawer which overlaps another strip of velcro on the main body when the drawer is in place. This stops any potential light leaks that I read about but might apply to an earleir model and keeps everything together just in case the magnets dont hold the drawer in properly. Overall, very pleased.

Rating (max 5):  
Three stars are generous.
01 November 2021  | 

Firstly this item is grossly overpriced for what it is, but then again most astro accessories are. But what annoys me about it the most is the fact that the detachable magnetised drawer isn't magnetised nearly enough. It constantly falls out in transit or when the scope is reorientated whilst on the mount. It is in constant danger of sending my expensive filters tumbling to the ground. I have had to resort to using a piece of gaffer tape to secure it in the holder for safety every time I add or change a filter. Hmmm very classy ZWO.

Rating (max 5):  
Does exactly what it’s supposed to
13 August 2021  | 

So much easier to change filters during an imaging session with this. Pricy for what it is, but it’s well made and very useful. Worth considering an extra filter holder too, to avoid threading/unthreading the filters in the dark

Rating (max 5):  
Nice little filter holder
22 June 2021  | 

A nice, well-made filter holder. The drawer is held in place with two magnets, but also with a spring-loaded pin in the side of the holder, in line with the drawer knob. This pin can be adjusted in and out with an Allen key, which alters how much it holds the drawer in place. If you're having problems putting the drawer in, you might want to back off this pin a little!

Rating (max 5):  
Works well
02 June 2021  | 

Does exactly what it’s supposed too. Works well and the filters screw into the drawer nicely. Glad I got it!

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