Upgrade of my lenses!

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[jamiebeale]

Hi everyone, im Jamie. I am new to HERAS and i am looking forward to going to some very good viewing spots with yourselves. I am though a newbie and have only got a 4.5 f5 skywatcher reflector so i am really appreciating the moon and Jupiter, although Jupiter is extremely small it is still awe inspiring. As i said i am new to this and i am unsure as to which lense would be best to upgrade to. I currently have a x2 barlow lense, 25mm wide eye relief and a super 10mm which all came with the telescope. However i do wish to improve my viewing with a new lense but i am aware that a lense could prove to be too powerful for my telescope. I am currently looking at the Orion epic ed-2 3.7mm. What do you guys think? Any advice or recommendation would be appreciated! Many thanks, Jamie

[flamencopaul]

Hi Jamie, welcome to HERAS.

There is a general rule about magnification - the maximum useable magnification is about 50x for each inch of aperture. Thus, for your 4.5 inch scope you would be looking at a max of about 225x.

You calculate the magnification as: telescope focal length divided by eyepiece focal length, which means that the 3.5 mm eyepiece giving about 160x mag should be OK.

For your 'scope you have: min magnification 16x (35mm eyepiece), max perception of detail at 57x (10mm eyepiece) and max magnification 225x (2.5mm eyepiece).

Your 'scope being f/5, should provide excellent views of the brighter deep sky objects. Try M13, M31, M27, M57, M82. Find them using your 25mm, then use the 10mm for seeing detail.

As regards viewing, you may want to have a look at the BLAS site. BLAS are based at Brough and have their own dome.

Seehttp://www.brough-astronomy.webs.com/ for more details


Cheers,

Paul.

[jamiebeale]

Hi Paul,

Thank you for your feedback. It has helped me understand a bit more about how the lenses work along side the telescopes. I need to brush up on my knowledge of deep sky objects and constellations as i am new to this. It does seem to me that i am not working the telescope properly because i continue to fail in my attempts to view the Andromeda Galaxy and other objects. I am going to purchase the Orion Epic ED-2 3.7mm and maybe a x3 barlow to help my viewing, also i will keep viewing the night sky and learn along the way.

Many Thanks Paul.

Jamie.

[jamiebeale]

As for the viewing at Brough i may have pass on that as i have no means of travel. But thanks again Paul.

Jamie

[flamencopaul]

Hi Jamie,

Not many people go up to Sancton these days unless it is for a special event such as a meteor shower or chance of seeing aurorae.

If it's easier for you to get to Beverley, maybe you should visit one of the ERA clubnights, you can get their contact details in the 'Local/National Societies' link from this website.

Depending on where you live in Hull, it might be possible to get you a lift out to Brough, give me a call on 01482 448060 to arrange something.

Paul.