Astreya other products

[mdine1us]

Hi Andrey,

First off, thanks for hanging around the forum. This is an interesting read. We all appreciate you taking your time to share your thoughts.

I just took delivery of an A&M 152/7 with your new air-spaced optics. Pictured below:


Thus far, I am extremely impressed! It seems to me to be a fabulous optic.

Perhaps I have missed this in an earlier post but, may I ask, what drove the decision to go to the air-spaced arrangement from the prior design?

Cheers,
Marty

[astreya]

Hi Marty,

your A&M 152/7 looks very impressive!
I wonder if you're going for imaging with your new scope? It would be interesting to see some pictures.
About your question. Yes, now we make only air spaced lenses.
The reason is that properties of immersion depend on many factors, such as the temperature, humidity, pressure, etc. When these factors are changing, the changes in immersion layer can occur and that changes can result in negative consequences, for example, to occurrence of bubbles in immersion layer, the tension influencing quality of the image, etc. So, we decided to refuse from gel immersion.

[mdine1us]

Hi Andrey,

Thanks! It is almost as much fun to look at as it is to look through! Indeed, my primary reason for getting the scope is to do imaging. I will be happy to share my pics as they become available. Right now, however, I am working on tuning the new mount, and getting the bugs out of my autoguider etc. so that I can actually get results worth posting! I have certainly been impressed with the results that Greg Hartke is getting from his!

The air-spacing makes sense to me. I always wondered how difficult quality control would be when gel was in the equation. Not being an optics expert, I assume that the overall design of the lens has to change to accomodate air-spacing. Does the change necessitate a different glass material too?

Regards,
Marty

[astreya]

Hi Marty,

OK, we're waiting for your pics!
I'm sure that your results will be not worse than Greg's. Greg made a big progress in imaging and particulary in image processing so he has some experience to share with you and other imagers. Hey, Greg are you ready to share your secrets with Marty?
Now about our air-spaces SAPO design. Going from immersion to air spaces, the designer receives additional parameters for correction of aberrations such as radii and thickness of air spaces. Using this new parameters it is possible to make colour correction even better than in immersion design. So, it's not necessary to change glass types for better correction. More over, this design has very high temperature stability and there is no any reason to change glasses.