chris gunn

For panos, 24mm is popular on APSC, and 35mm on FF. On APSC I use my 24/1.4. 60s exposures @f2 with Astrotracer, or 15s @f1.4 untracked. The longer you go with a rectilinear lens, the less  trouble ...

Tiny pics! Here's a similar larger jellyfish image: http://moonrocksastro.com/wp-content/uploads/2015/12/A.jpg-web.jpg

The rectilinear distortion changes as the sensor moves.

No, I'm pretty sure it's the result of the rectilinear distortion, which changes as the sensor moves.

I don't understand what I'm seeing in the third black light photo, but it looks very cool! The model stepping on herself also looks fun!

Looking at the cat hair, that is a really sharp lens!

A fun foreground helps a lot!

A good exposure is 120s @ f2.8, which at f4 would be 480s I do my panos on the K5  at f2, 60s

I bought one of these recently. They give peace of mind! I need more.... So many lenses. Have you tried your 300mm? Do you post your astro pics somewhere?

The Takumar? Some AP PP skills here! Good job on not over exposing Trapesium. Looks like you stopped down on Rho?

IIRC, it's pretty good.

I like it, but it is offset from the MW. It might be better lined up.

My 1st reply above has a 600mm image done with Astrotracer. I have a geared head to manually adjust between frames. I couldn't use a 600mm lens with that. Well, that sounds interesting! I'll have a ...

I've been wondering how to set up something like this. At 600mm I can really struggle!

Because the sky moves, you will have to make adjustments every few frames anyhow. I've done over 100 frames at 400mm for one image. Yes, to help the nebulae stand out star reduction is common. I ...

120s @f4. That's about exactly the exposure Roger tends to use (60s @ f2.8), but he uses ~30 frames. That's the nebula I was talking about ( North America Nebula , NGC 7000 ). I've never imaged it ...

On the last two, I notice a big dust speck lower right. I think I see a hint of the nebula in cygnus in your stack. ways of enhancing nebulae are described in R Clark's site: http://www.clarkvision ...

Looks like your copy is fine, and your concerns are satisfied. It's one of the lightest 400 out there, which is really nice  if you're hiking. It took me a few years to warm up to it though!

Great composition! I looked at you site. I think I'm seeing a lot of pixel-shift focus stacking! Congrats.

The second image has most interesting water reflection squiggles!