Back Focus On Celestron EdgeHD 8 With 0.7x Reducer, ZWO Filter Drawer & ASI533MC Pro Camera.

[@Tom-n2t]

Probably one of the best videos i have found that covers the content extremely well. You definitely have a skill for effectively communicating and covering the content in such an easy to follow way! I have no doubt that this will help thousands if not millions of others on their journey to astro photography. I know i have learned lots watching this as well. Well Done!

[@AstroCrescent]

Glad you enjoyed it! Thanks for your kind words of appreciation.

[@MrMartgolf]

Wow great vlog, this is just the setup I am lucking for eventually, I haven’t got my C8 HD yet but your videos will be watched over and over till I get mine, Thank you Martin 👍

[@AstroCrescent]

Thanks for watching! I’m glad that the videos are helpful. All the best for your new C8!! Clear Skies!

[@scorpianspirit5124]

This was very helpful. I have exactly the same setup, edge 8 inch HD and I just ordered the asi533mc. I'm a bit rusty as I have not done any imaging in 10 years and decided to get back into the hobby. My, how things have changed in 10 years. I just received the new ASIAir plus and the asi662mc planetary camera which will do double duty as a guide camera and planetary imaging on my other scope, a Nexstar 5SE. I have the 5 inch mounted on a SW StarAdventurer GTI eq mount for the planets and wider field objects. I'm going to go through your channel and take a look what you have done in other videos. Thanks much, and cheers from the dry and dark desert in Utah... ;-)

[@davidf9494]

Good video! My one and only telescope is an EDGE HD 8. Hyerstar imaging for nebula season in North America and f-7 for galaxies and small objects. Looking forward to seeing your next video.

[@AstroCrescent]

Thanks! I’m glad you liked the video. Cheers!!

[@charlespeters9626]

Very clear and precise description. Thank you for making the video.

[@AstroCrescent]

Thanks Charles! I’m glad that the video is helpful.

[@gregerianne3880]

Fantastic video/demo, Pawan! Thanks so much.

[@AstroCrescent]

Thanks for watching! I’m glad that you liked the video. Cheers!

[@taraswertelecki3786]

I own one of these telescopes and have the reducer made for it. A long term goal I have is to get to where I can take long exposure photos through it once I master the black art of auto-guiding, which is proving to be complicated despite having a Skywatcher EQ6R Pro mount. I intend to use an off-axis guider at this time, but I have acquired a 61mm apochromatic refractor that can serve as a guide scope. I have a ZWO 533MM monochrome camera, filter wheel and filter set, so the 21mm spacer would be replaced with the EFW-mini filter wheel. I don't anticipate imaging many objects at F/10 other than small and bright planetary nebulae such as M-57 or NGC-3242.

[@AstroCrescent]

Thanks for watching! Appreciate that you took time to comment. You got a very nice imaging run with you. I’m sure you will enjoy it a lot. Clear Skies!!

[@astroterrace]

Great video. I wanted reducer to increase the field of view and required image train and you explained very well in the video.

[@AstroCrescent]

Thanks! I'm glad that the video was helpful. CS!

[@DSOImager]

Great video Pawan. Very useful. Also, you're getting close to 1k subscribers! :)

[@AstroCrescent]

Thanks James! Could not have done it without your kind support. Your videos have always been very helpful and great inspiration. CS!

[@scotiaastro]

Excellent video, mate! Extremely helpful breakdown of an essential part of Astro imaging! Nice job... :)

[@AstroCrescent]

Thanks a lot! I still have to install the EAF before I can start imaging with this setup. CS!

[@YASAJTV]

Excellent content. Keep bringing us quality videos. Thanks

[@AstroCrescent]

Thanks!! I'm glad that the video was useful. Clear Skies!

[@YASAJTV]

@@AstroCrescent What is your recommendation for Celectron 8SE reducers, please?

[@AstroCrescent]

@@YASAJTV You definitely an f/6.3 reducer/corrector for nebulae and other larger objects as the field of view is very narrow for an 8" scope. For planetary observations and imaging, it is not required. In fact, you might want to use a 2x or 3x barlow instead. Hope this helps. Clear Skies!

[@MrStrativarius]

Thank you for this video. I just got an Edge 8 HD plus a AVX mount and a bunch of goodies for a truly amazing deal. So I have an almost identical setup, same telescope and camera, guide scope and guide camera, but I'm using an EQR6-PRO. I also just ordered the .7 focal reducer. I'm just now realizing that I will need a filter drawer for my dual band 2 inch filter. (This is an expensive hobby!) Are you still using the Svbony guide scope with your Edge 8 HD? I've heard people get better results with OAG, so I was considering that, but wanted to hear from others too. All of your videos have been great. Thanks again! Aaron in Minnesota.

[@AstroCrescent]

Congratulations on purchase of the new Astro gear. This is probably the best for planets and small galaxies. I didn’t use the SV Bony guidescope much because of its weight. My AVX mount is limited to only 30 lbs. I was thinking of getting either EQ6R-Pro or ZWO AM5. But things changed drastically and I’m not able to wake up at nights for Astro imaging for the time being. Good luck with your new setup. I’m sure you will enjoy it a lot. And yes, it’s an expensive hobby without any doubt. Cheers!!

[@hismasterstelescope]

Another nice video. Thanks for your efforts.

[@AstroCrescent]

Thanks for your kind words! Cheers!

[@rodneydingman267]

Great video,looks like a good set up

[@AstroCrescent]

Thanks a lot! CS!

[@cristusvincit]

Thank you, your video helps a lot.

[@AstroCrescent]

Thanks for watching!! I'm glad that these videos are helpful. Cheers!

[@patrickshea7073]

How did you fasten your asiair Plus to your scope?

[@AstroCrescent]

I removed the bracket for view finder scope and then installed a simple all purpose dovetail bracket. You can easily get it from your local telescope dealer or from Amazon. Clear Skies!!

[@jonb595]

Thank you sir, Helps a lot on install

[@AstroCrescent]

You are very welcome! I’m glad that the video is helpful. Clear Skies!!

[@tma5239]

Great information. Thanks. Where do I get all the spacers for the correct back focus?

[@AstroCrescent]

Thanks! I’m glad that the video is informative. You can get the spacers from your local telescope dealer. Clear Skies!!

[@r.g.wilson4567]

Outstanding explanation…. Thank you. Have you found it necessary to adjust the back focus due to the thickness of the filter in the filter drawer?.

[@AstroCrescent]

Thanks! No, the minor thickness of filter practically does not affect the back focus. Cheers!

[@manish1983astraz]

Superb

[@AstroCrescent]

Thank you! Cheers!

[@andrewmiller5311]

Do you have to add 1mm for a 3mm filter inclusion ?

[@AstroCrescent]

Not really but you can if you want to. Doesn’t make a big difference in the images. Thanks for watching! CS!!

[@sreeshab4093]

The T-adapter it is said is needed only for DLSR cameras, and not for astro cooled cameras. can u please clarify

[@AstroCrescent]

Thanks for watching! You need the 50mm T-adapter for any imaging camera, whether cooled Astronomy camera or a DSLR camera.

[@sreeshab4093]

@@AstroCrescent ok thanks. what is the diameter of T-adapter?

[@AstroCrescent]

@@sreeshab4093 I didn’t measure the diameter. But, It’s specifically made for only Edge HD 8. The Ta-adapter for SCT 8 will not fit on Edge HD 8. Thanks.

[@AstroCrescent]

@@sreeshab4093 The thread on T-adapter is M42 (42mm). You might need a M42 to M48 ring for further attachments. Thanks.

[@sreeshab4093]

@@AstroCrescent thank you.

[@sreeshab4093]

Hi, i have edge 8, 0.7x reducer and the t-adapter of edge 8. i need 105.3 backfocus for my zwo camera 2600mc. the camera has flange distance of 17.5mm to the sensor. i have two spacers that came with 2600mc which 21mm and 16.5mm - both M54M-M54F. can u please help me how do i achieve 105.3 backfocus. thank you for ur time.

[@AstroCrescent]

Please checkout the official connection diagram for ZWO ASI2600MC Pro camera on ZWO website to get correct back focus distance: astronomy-imaging-camera.com/product/asi2600mc-pro-color/ This link shows how to get 55mm back focus for the camera. When you add the T-adapter, it gives you another 50mm distance. You will need two ZWO M42-M48 adapter rings. You may also check out the method to achieve 105mm bck focus on the one page instruction sheet that comes with Celesgron 0.7x reducer. Here is the online ink: s3.amazonaws.com/celestron-site-support-files/support_files/94242_reducer_inst_sheet.pdf In this video, please watch at 9:13 how I achieved a back focus distance of 105mm for my ASI533MC Pro camera. Hope this helps. Clear Skies!!

[@sreeshab4093]

@@AstroCrescentmany thanks. will check it out.

[@anata5127]

I could use adaptor rotator (15-20 mm) instead of 16mm ZWO adaptor. Celestron adaptor is very inconvenient for rotation. I did not know that there is need for correct focal distance for train without reducer.

[@AstroCrescent]

Thanks for watching! Every imaging train needs a correct back focus, with or without the reducer. Clear Skies!

[@anata5127]

@@AstroCrescent Sorry, every image train doesn’t need back focuser; only with reducer or flattener need. I have Edga9.25, Newtonian Epsilon 160 and Refractor Esprit 120. When no flattener or reducer, I spin focus until I get in focus. I don’t calculate adaptors as you do. Field is as flat as you wish, and my sensor is IMX571, which is by far larger than your imx533.

[@AstroCrescent]

Thanks for your valuable input. My information is based on Celestron manual for the reducer. Back focus, in its simplest definition, is the measurement between the last optical component, such as a corrector or reducer, of your telescope and the focal plane. When using your telescope stock without any accessories, you can easily reach focus because the telescope’s focuser travel is designed to move around this distance. However, when you’re using a corrector or reducer, back focus must be a set distance away. Clear Skies!!

[@anata5127]

@@AstroCrescent Not entirely correct. It depends on design. Petzval design has corrector, but not backfocus. The same for Edge. It has build-in corrector, but backfocus contribution is not apparent. However, you are right. Celestron recommends to get some number. I ignored it and never had problems. On other hand, backfocus for reducer is real, and not following it will distort picture.

[@AstroCrescent]

@@anata5127 Thank you.

[@lukesastro2380]

Great video!

[@AstroCrescent]

Thanks Luke!

[@سبحانخالقالكون-ش3ز]

جميل

[@AstroCrescent]

Thanks a lot! Cheers!