Probably a very silly question but...

[nitram100]

I have just ordered an Explore Scientific 14mm 82 degree eyepiece.

If I combined this with my Celestron Ultima Barlow will I end up with a 7mm 82 degree eyepiece? Or will I lose FOV by using the Barlow?

Thanks,

Mart

[Andrew*]

Yes, you will end up with 7mm, but the 82° field will be maintained.

Sometimes barlows vignette slightly which darkens the outside of the FOV but this is usually very slight.

[ronin]

Agree that the eyepiece FoV will not change, you have done nothing to the eyepiece to alter it's FoV.

You have altered the scope focal length but no change to the eyepiece so it's FoV will remain at 82Deg.

Owning to the scope focal length doubling the magnification doubles and so the AFoV changes but the eyepiece is unchanged.

[nitram100]

Oh great thanks guys, that will save me some money until I can afford a dedicated high power 82 degree eyepiece.

[twotter]

One of the great things about SGL is there is no such thing as a silly question

[Andrew*]

One of the great things about SGL is there is no such thing as a silly question

Well said

[crashtestdummy]

One of the great things about SGL is there is no such thing as a silly question

so true!no such thing as a silly question

[swamp thing]

Lets try and clear up some acronyms here it could save some confusion.

AFOV = Apparent field of view. This is the angular size of the picture window of the eyepiece being, used.this is set by the design of the eyepiece and doesn't change regardless of whether or not a Barlow is being used.

TFOV = True field of view. This is the actual area of sky that can be seen. This is measured in degrees for wide field, and minutes of arc for narrow fields. TFOV changes with each different eyepiece or eyepiece Barlow combinations.

[rowan46]

What's the difference between a chicken?

[Mark in Macc]

Now that is a silly question, but it didn't half make me laugh!

[Bart]

Now that is a silly question, but it didn't half make me laugh!

Yes silly question or you have a very short attention span:)

Barry