ASI224 Adapter size

[sorrimen]

Hi all

Need to buy a 1.25” nosepiece for my new asi224. The zwo one is about £20, so would rather get something cheaper. Are T/T2 adapters compatible with the camera? It seems to be listed as M42 and I’ve read that they have different thread pitches, but then the diagrams say M42*0.75 (T/T2 thread pitch size) so I’m a bit confused. 

Cheers

Ross

p.s. I know there should be one in the box, but I bought an ‘as new’ one and the seller helpfully didn’t mention that it was missing, then refused to help me with the cost of a new one, so here am I looking for the cheapest option!

[Cosmic Geoff]

The ASI224 body connects to a T or T2 thread. I have some of these adapters and they fit - sorry I can't be more specific.  It also screws into a flip mirror diagonal I own.  You should be able to find something that gives a 1.25 nosepiece, but note you do not have to connect the camera that way.  It also has a 2" diameter section, BTW.

[sorrimen]

1 minute ago, Cosmic Geoff said:

The ASI224 body connects to a T or T2 thread. I have some of these adapters and they fit - sorry I can't be more specific.  It also screws into a flip mirror diagonal I own.  You should be able to find something that gives a 1.25 nosepiece, but note you do not have to connect the camera that way.  It also has a 2" diameter section, BTW.

Ah great thanks a lot. Yeah I think I’m unable to get enough backfocus that way, and with my barlow being 1.25” I think I have to get the adapter! 

[Peter_D]

1 hour ago, sorrimen said:

Ah great thanks a lot. Yeah I think I’m unable to get enough backfocus that way, and with my barlow being 1.25” I think I have to get the adapter! 

If you do get the adapter, make sure it is threaded to allow for filters. I have a couple of these nosepieces - the Zwo one is threaded but the other one isn't so just something to double check.

[Elp]

M42s do fit but I suppose it depends on their threads, the 8 and the 4 are astro essentials:

[sorrimen]

13 hours ago, Peter_D said:

If you do get the adapter, make sure it is threaded to allow for filters. I have a couple of these nosepieces - the Zwo one is threaded but the other one isn't so just something to double check.

You know what, I didn’t even check before I bought it but I’ve looked again and it does have filter threads. Almost saved me a bit of a headache there thank you!

[sorrimen]

12 hours ago, Elp said:

M42s do fit but I suppose it depends on their threads, the 8 and the 4 are astro essentials:

Yeah it’s slightly annoying that they describe it as an M42 to 1.25” nosepiece when in reality it’s got the T/T2 thread. Got a cheap ebay one, but if that fails astroessentials it is.

[Elp]

Tbh, I doubt much photographic equipment has a 1mm thread pitch as it's quite coarse, I've just checked the following with a thread gauge and they all look to be 0.75mm pitch (the 1mm was no match):

Zwo 1.25 nosepiece adaptor,

Astro essentials m42 spacer ring,

224mc camera body nosepiece/m42 thread in front of the sensor,

A canon tring adaptor.

Edited July 20, 2022 by Elp

[Peter_D]

1 hour ago, sorrimen said:

You know what, I didn’t even check before I bought it but I’ve looked again and it does have filter threads. Almost saved me a bit of a headache there thank you!

Cool.

I mostly use the recommended UV-IR cut filter and I screw it in the nosepiece at the sensor end and just leave the nose piece on the whole time.  The filter at the sensor end stays cleaner I find than if it were at the end of the adapter.

[AstroMuni]

On 19/07/2022 at 19:19, sorrimen said:

Need to buy a 1.25” nosepiece for my new asi224.

If you purchased this new, it should have come with nosepiece adapter. Atleast mine did.

[sorrimen]

3 hours ago, AstroMuni said:

If you purchased this new, it should have come with nosepiece adapter. Atleast mine did.

Yeah unfortunately I bought it off someone. They didn’t mention it was missing, which was slightly irritating, and for £20 I wanted to find a cheaper alternative. 

[sorrimen]

On 20/07/2022 at 12:53, Elp said:

Tbh, I doubt much photographic equipment has a 1mm thread pitch as it's quite coarse, I've just checked the following with a thread gauge and they all look to be 0.75mm pitch (the 1mm was no match):

Zwo 1.25 nosepiece adaptor,

Astro essentials m42 spacer ring,

224mc camera body nosepiece/m42 thread in front of the sensor,

A canon tring adaptor.

Oh interesting. Knew nothing about threading before this so it’s quite good I’ve got it out the way early. Still a little frustrating they label things as M42 when they’re actually T/T2!

[sorrimen]

On 20/07/2022 at 12:57, Peter_D said:

Cool.

I mostly use the recommended UV-IR cut filter and I screw it in the nosepiece at the sensor end and just leave the nose piece on the whole time.  The filter at the sensor end stays cleaner I find than if it were at the end of the adapter.

Yeah just got my filter today, will follow this advice. Thanks!

[Elp]

31 minutes ago, sorrimen said:

Oh interesting. Knew nothing about threading before this so it’s quite good I’ve got it out the way early. Still a little frustrating they label things as M42 when they’re actually T/T2!

The m42 relates to it being for a 42mm diameter hole, it's the same with bolts though if you measure the holes for them they're usually slightly smaller due to measuring at the peak of the threads.

[Cosmic Geoff]

On 20/07/2022 at 12:57, Peter_D said:

I mostly use the recommended UV-IR cut filter and I screw it in the nosepiece at the sensor end and just leave the nose piece on the whole time.  The filter at the sensor end stays cleaner I find than if it were at the end of the adapter.

I'd never have thought of that. But the adapter is threaded all the way through, and there is a recess at the inner end.

OTOH it is much easier to swap between filters, e.g. visual and IR pass, if they are screwed on the outer end.