EOS Lens Adapter Loose - EFW Version: Page 2

EOS Lens Adapter Loose - EFW Version

Support@ZWO

James_Sorenson wrote:
Looks like you have the same one as I do. I have tried spacing with shims several times and varified that I have the correct total spacing for everything. Can't seem to get rid of the lens tilt in my images.

Did you try our new EOS adapter?

james_sorenson

I haven't. I wasn't aware that there was a new adapter until I discovered this thread about a week ago. I've been fighting issues with the one I got since I purchased it.

ramanmadhira

The ZWO EOS lens adapter is stuck to my lens. I cannot twist and remove. I need to mount this tomorrow on another lens. Can you please help?

Regards,

Ray

Support@ZWO

ramanmadhira wrote:
The ZWO EOS lens adapter is stuck to my lens. I cannot twist and remove. I need to mount this tomorrow on another lens. Can you please help?

Regards,

Ray

If it is too tight, Wear rubber gloves.

there is a triggle, press it down, just like DSLR. And screw the lens at same time.

james_sorenson

Ughhh....So I purchased the newest version of the adapter thinking the fixes were implemented in it. Spent several nights test imaging and getting the spacing right and checking my stars. They still have lens tilt aberration's. Took everything apart and measured the thickness of the adapter at different points, Looks like I still need to do shimming on it.... Also, looks like the bottom and top surfaces aren't parallel to eachother, one surface is tapered since it rocks in my caliper jaws.

eos_adapter_measurments.jpg

Support@ZWO

James_Sorenson wrote:
Ughhh....So I purchased the newest version of the adapter thinking the fixes were implemented in it. Spent several nights test imaging and getting the spacing right and checking my stars. They still have lens tilt aberration's. Took everything apart and measured the thickness of the adapter at different points, Looks like I still need to do shimming on it.... Also, looks like the bottom and top surfaces aren't parallel to eachother, one surface is tapered since it rocks in my caliper jaws.

eos_adapter_measurments.jpg

Thanks for feedback. We are working on it, it's the fourth time we redesign this adapter in this year, we keep working on it until the issue solved.

james_sorenson

So I am trying something simple. Shimming never has worked, so a possible simple solution. I took the adapter apart by taking off the m42 ring. I wet sanded with fine grit sandpaper on a granite surface block the thin face that actually contacts the surface of the second half of the adapter. I put the adapter back together and measured with a dial test indicator the flatness each time that I did to make sure I'm not over doing it on the thin areas while applying minor pressure to the thickest areas while sanding until uniformly flat. Looks like that did the job. Have it down to 0.0005" at the highest point if I rotate it around. Now I need to wait for the next clear weather to test it to see if my stars are any better.LRM_EXPORT_100509195310575_20181115_050658115.jpeg

LRM_EXPORT_100568007190918_20181115_050756927.jpeg

Support@ZWO

James_Sorenson wrote:

So I am trying something simple. Shimming never has worked, so a possible simple solution. I took the adapter apart by taking off the m42 ring. I wet sanded with fine grit sandpaper on a granite surface block the thin face that actually contacts the surface of the second half of the adapter. I put the adapter back together and measured with a dial test indicator the flatness each time that I did to make sure I'm not over doing it on the thin areas while applying minor pressure to the thickest areas while sanding until uniformly flat. Looks like that did the job. Have it down to 0.0005" at the highest point if I rotate it around. Now I need to wait for the next clear weather to test it to see if my stars are any better.LRM_EXPORT_100509195310575_20181115_050658115.jpeg

LRM_EXPORT_100568007190918_20181115_050756927.jpeg

Hi James, thanks for telling us. waiting for your test result.

richardd

Thank you for sharing your experience, guys. I've found some answers for myself.

Support@ZWO

We made some modification in design, loose or tight probelm will be reduced a lot.

james_sorenson

Sorry for the long delay. Weather has been bad. But since my last post, I have been out quite a few nights and my solution did the trick. My lens is a Rokinon 135 f/2 and that is coupled to the adapter to an EFW and my asi178mm-cool. I could put together a before and after corner aberration comparison. There is still a slight hint of elongated stars in two corners, but I think that can be delt with a little more sanding of the adapter because I didn't get it down to perfect.

-James

davefrance

How do we know we are buying the latest one from a stockist. Is there some form of identification, serial number? It could be months before they restock.

Support@ZWO

James_Sorenson wrote:

Sorry for the long delay. Weather has been bad. But since my last post, I have been out quite a few nights and my solution did the trick. My lens is a Rokinon 135 f/2 and that is coupled to the adapter to an EFW and my asi178mm-cool. I could put together a before and after corner aberration comparison. There is still a slight hint of elongated stars in two corners, but I think that can be delt with a little more sanding of the adapter because I didn't get it down to perfect.

-James

Thank you for update.

Support@ZWO

DaveFrance wrote:

How do we know we are buying the latest one from a stockist. Is there some form of identification, serial number? It could be months before they restock.

It's a good suggestion, we didn't have serial numbers before, I will ask our engineer if we could know the version form outlook.

ricardinho

This product is the fraud of the year! I love astrophotography with lenses and I bought 2 of them and tested all my Canon EF lenses (and on my 4 zwo Asi183mc, asi294mc and mm and asi6200mm cameras). It will only work on lenses over 200mm. It didn't even focus with my 200mm fixed lens f /2.8 canon, using an asi294mc and an L-pro filter.

Zwo's suggestion ("it's not a joke"): remove the T2 adapter. Great, then I'll have to buy another adapter for my camera (or use it in a filter wheel, to complicate things). Using the filter only, without a wheel, will never work, because removing the T2 it is not possible to put a filter inside it.

I would like to know if they will refund their customers?

« Previous Page