What does a longer focal length give you?

The 130PHQ has a native focal length of 1000 mm and an aperture of 130 mm. With my camera, it gives a much narrower view than my 105 mm SV535 or my earlier 400 mm FRA400.

That is useful for smaller galaxies, star clusters, and details within nebulae. It can also mean your favourite large target no longer fits.

Use a framing calculator with your actual sensor size and several intended targets before choosing a telescope. Also think about what limits your current images. If the main problem is poor focus or too little data, a longer telescope won’t fix it.

See the equipment and buying links for the setup described in this guide.

Are you ready for the extra demands?

You don’t need perfect results before trying a longer focal length, but it helps to have a dependable routine with the equipment you already own.

• You can set up, polar-align, find a target, and focus without having to solve everything afresh.
• You can recognise focus problems, star trailing, cloud, and dew in your test exposures.
• You understand how your mount behaves and have a workable guiding setup.
• You can collect and process a series of exposures with suitable calibration frames.
• You have room, power, and a safe way to move and mount the heavier equipment.

If one of those is still frustrating, improving it may be a more useful next step than increasing the focal length. The aim is a setup you enjoy using often.

Tracking, guiding, and focus matter more

A small movement covers more pixels when the focal length increases, if the camera stays the same. Errors that were difficult to see in a widefield image may now stretch the stars.

Start with a stable mount, good balance, sensible cable routing, and careful polar alignment. Guiding can correct small tracking errors, but it can’t rescue every mechanical problem or a cable that catches as the mount moves.

My permanent garden pier has been a huge boon. It gives the mount a rock-steady base and helps preserve the polar alignment between sessions, so I can make better use of short gaps in the clouds. I still check the alignment if anything has moved. There’s more about the benefit of a pier in my top upgrades article.

My current 130PHQ setup uses an Askar M54 off-axis guider and ZWO ASI220MM Mini. An off-axis guider takes guide light through the main telescope. This helps avoid the relative movement that can occur between a separate guidescope and the imaging telescope.

That doesn’t make a guidescope unusable. I used one for years. The important test is the shape and consistency of the stars in the actual exposures, rather than chasing an impressive guiding number on its own.

Focus deserves the same attention. I use a ZWO EAF, and set it to autofocus every hour. Turbulent air can blur the view even when your equipment is working well, so more focal length doesn’t guarantee more resolved detail every night.

The off-axis guider review explains my change in more detail.

Consider the size as well as the specification

The 130PHQ is a big refractor. In my original review, the complete setup weighed 16.4 kg. That figure described the accessories fitted at the time, but it gives a useful sense of the practical challenge.

The length matters too. Check clearance around the tripod or pier, the camera, and trailing cables throughout the mount’s movement. Think about the meridian flip before leaving an imaging sequence running. This is when an equatorial mount swings the telescope to the other side of the pier as the target crosses the north-south line in the sky. Check that the camera and cables have room, and watch the first one before trusting the automation.

I move the telescope a short distance from the shed to the garden mount. Regularly carrying it to a remote observing spot would be a different proposition. Choose equipment you can lift and secure comfortably.

I use an EQ6-R Pro that has been rebuilt by DarkFrame Optics. It is the performance of the complete loaded system that matters. A mount’s advertised payload alone doesn’t tell you how well it will image with a long telescope.

My 130PHQ review covers its fittings and handling. At its native focal length the optical design avoids a fixed flattener-to-sensor spacing requirement, although you still need to reach focus. The optional reducer introduces its own spacing requirement.

Choose a manageable first target

For a first session, pick a fairly bright object that fits comfortably and stays above your obstructions. A star cluster such as M13, when well placed, lets you concentrate on focus, framing, and round stars. Check that the bright centre isn’t being saturated unnecessarily.

My beginner targets for every season guide has more suggestions, including M3, M13, and the Pacman Nebula. Use the framing tips to see which will suit your setup.

The photographs below show the kind of work I use the 130PHQ for. They are finished projects, built from many exposures, rather than first-night benchmarks.

The 130PHQ operates at f/7.7 without its optional reducer. Faint galaxy arms and wisps of nebula still need long total integration times to stand out from the noise under Bristol’s light-polluted skies. A bigger telescope doesn’t make the streetlights disappear! Plan to collect many hours of good exposures on the same target, often over several nights. It’s the total usable data that matters, rather than simply making each individual exposure longer.

I now often aim for around 20 hours on a project, but that isn’t an entry requirement. Start with a useful result and add more data as your confidence grows. My How to Get Long Integration Times article explains how planning, automation, and a quick setup routine help me fit those hours around the British weather.

Start with a test session

1. Check the rig in daylight. Confirm the connections, balance, and clearance. Recheck the cables with the camera in its intended orientation.
2. Align and focus. Polar-align the mount, find the target, and focus before starting a long sequence.
3. Test guiding and exposure. Take several frames and inspect their stars, including the edges. Change one thing at a time if something is wrong.
4. Run a short sequence. Check how focus and tracking hold up. Keep an eye on dew, wind, and approaching obstructions.
5. Calibrate and review. Take the appropriate calibration frames, process the usable exposures, and decide what to improve next time.

Once the rig is running reliably, a controller such as my ASIAIR Plus can handle planned imaging sequences. Plate solving, which matches the stars in an exposure to a sky map, helps me centre the same target again on another night. That makes building up the long integrations needed through light pollution much more manageable. More photons, less time standing in the cold!

The processing guide explains what happens after capture. If this setup feels like more than you want to take on, a widefield rig remains capable of wonderful photographs. There isn’t a finish line that requires the largest telescope.

Equipment and buying links

These are examples from my 130PHQ setup. The telescope, mount, and guiding equipment work as a system, so check the complete load, connections, and available spacing before ordering.

These are affiliate links. If you buy through them, I may earn a commission at no extra cost to you. Check the retailer for current prices and availability.

Askar 130PHQ

My 1000 mm refractor for a closer view of smaller targets. Read the handling section before deciding: the size of a fully assembled rig matters as much as the specification. The retailer links are for the telescope, without the imaging accessories shown.

Read my review

Check price at Astroshop.eu Check price at High Point Scientific

Sky-Watcher EQ6-R Pro

This was the starting point for my mount, which DarkFrame Optics rebuilt into a StellarDrive X 6R Pro. These links are for the standard EQ6-R Pro, without the rebuild.

Read about my mount rebuild

Check price at Astroshop.eu Check price at High Point Scientific

Askar M54 off-axis guider

This takes guide light through the 130PHQ, avoiding the relative movement possible with a separate guidescope. Check the fittings, spacing, and guide-camera focus as part of the whole imaging train.

Read my review

Check price at Astroshop.eu Check price at High Point Scientific

ZWO ASI220MM Mini

The guide camera I pair with the Askar M54 off-axis guider. It supports the guiding system; a separate imaging camera takes the photographs.

Read my review

Check price at Astroshop.eu Check price at High Point Scientific

Camera and control

ZWO ASI2600MC Pro

My cooled colour camera for this rig. For me, it’s the gold standard! The retailer links are for the 2025 version.

Read my review

Check price at Astroshop.eu Check price at High Point Scientific

ZWO ASIAIR Plus

The controller I use to automate imaging sequences and return to the same target across several nights. Handy for collecting the hours of data that faint targets need through city light pollution!

It works with ZWO astronomy cameras and focusers, selected DSLR and mirrorless cameras, and supported mounts. Check ZWO’s compatibility information for your exact kit before buying.

Read my review

Check price at Astroshop.eu Check price at High Point Scientific

My full equipment page also covers the focuser, filters, and other accessories.